Respiratory protective devices -- Classification for respiratory protective device (RPD), excluding RPD for underwater application

ISO/TS 16973:2016 specifies the classification of Respiratory Protective Devices based on their performance. The performance requirements are given in the relevant performance standards.

Appareils de protection respiratoire -- Classification pour les APR, à l'exclusion des APR pour application sous-marine

L'ISO/TS 16973:2016 définit la classification des appareils de protection respiratoire compte tenu de leurs performances. Les exigences de performances sont données dans les normes de performance applicables.

General Information

Status
Published
Publication Date
31-Mar-2016
Current Stage
9093 - International Standard confirmed
Start Date
01-Sep-2020
Ref Project

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TECHNICAL ISO/TS
SPECIFICATION 16973
First edition
2016-04-01
Respiratory protective devices —
Classification for respiratory
protective device (RPD), excluding
RPD for underwater application
Appareils de protection respiratoire — Classification pour les APR, à
l’exclusion des APR pour application sous-marine
Reference number
ISO/TS 16973:2016(E)
ISO 2016
---------------------- Page: 1 ----------------------
ISO/TS 16973:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/TS 16973:2016(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Mode of operation ............................................................................................................................................................................................... 1

5 Protection classes (PC) ................................................................................................................................................................................... 2

6 Work rate ...................................................................................................................................................................................................................... 2

7 Respiratory interface class ........................................................................................................................................................................ 3

8 Supplied breathable gas RPD capacity class ............................................................................................................................ 3

9 Filter class.................................................................................................................................................................................................................... 3

9.1 Particle filter class ................................................................................................................................................................................ 3

9.1.1 Particle filter efficiency .............................................................................................................................................. 3

9.1.2 Particle filter work rate class ................................................................................................................................ 4

9.2 Gas filter class .......................................................................................................................................................................................... 4

9.2.1 General...................................................................................................................................................................................... 4

9.2.2 Gas filter capacity ............................................................................................................................................................ 4

9.2.3 Gas filter work rate class ........................................................................................................................................... 5

10 RPD using standardized connector ................................................................................................................................................... 5

11 Special application class ............................................................................................................................................................................... 5

11.1 General ........................................................................................................................................................................................................... 5

11.2 Firefighting class ................................................................................................................................................................................... 6

11.3 Chemical, biological, radiological and nuclear class ............................................................................................... 6

11.4 Marine class ............................................................................................................................................................................................... 6

11.5 Mining class ............................................................................................................................................................................................... 6

11.6 Abrasive blasting class ..................................................................................................................................................................... 7

11.7 Welding class ............................................................................................................................................................................................ 7

11.8 Escape class ............................................................................................................................................................................................... 7

12 Sequence of marking information ..................................................................................................................................................... 8

12.1 Sequence of marking-supplied breathable gas RPD ............................................................................................... 8

12.2 Sequence of marking-filtering RPD ....................................................................................................................................... 8

12.3 Sequence of marking-filter ........................................................................................................................................................... 9

12.4 Sequence of marking-respiratory interface using standardized connector....................................... 9

12.5 Sequence of marking-filters using standardized connector ............................................................................ 9

Annex A (normative) Classification and related marking scheme overview ..........................................................10

Annex B (informative) Examples for ISO classification and related marking.........................................................15

Annex C (informative) Special applications ...............................................................................................................................................24

Annex D (informative) Work rate class ...........................................................................................................................................................26

Annex E (informative) Respiratory interface class .............................................................................................................................28

Bibliography .............................................................................................................................................................................................................................30

© ISO 2016 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/TS 16973:2016(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.

ISO/TS 16973 was prepared by Technical Committee ISO/TC 94, Personal safety — Protective clothing

and equipment, Subcommittee SC 15, Respiratory protective devices.
iv © ISO 2016 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/TS 16973:2016(E)
Introduction

This Technical Specification contains the classification of Respiratory Protective Devices (RPD) and the

related marking in accordance with the requirements of the performance standards.

The basic classification, which applies to all RPD, will be marked in the following order:

a) protection class;
b) work rate class;
c) respiratory interface class.
Some examples for marking of commonly known RPD are included in Annex B.

For Supplied Breathable Gas RPD, the classification also includes gas capacity class.

For Filtering RPD, the classification also includes a particle filter class and/or the gas filter types and

classes.

RPD designated to be used for Special Applications are further classified accordingly.

The special applications identified are
— Firefighting,
— Chemical, Biological, Radiological and Nuclear (CBRN),
— Marine,
— Mining,
— Abrasive blasting,
— Welding, and
— Escape.

Each RPD will have an individual classification based on its performance specified in the relevant

performance standards.

Explanations of the classification and examples of the classification of RPD are given in the Annexes.

The following definitions apply in understanding how to implement an ISO International Standard and

other normative ISO deliverables (TS, PAS, IWA):
— “shall” indicates a requirement;
— “should” indicates a recommendation;
— “may” is used to indicate that something is permitted;

— “can” is used to indicate that something is possible, for example, that an organization or individual

is able to do something.

3.3.1 of the ISO/IEC Directives, Part 2 (sixth edition, 2011) defines a requirement as an “expression in

the content of a document conveying criteria to be fulfilled if compliance with the document is to be

claimed and from which no deviation is permitted.”

3.3.2 of the ISO/IEC Directives, Part 2 (sixth edition, 2011) defines a recommendation as an “expression

in the content of a document conveying that among several possibilities one is recommended as

particularly suitable, without mentioning or excluding others, or that a certain course of action is

© ISO 2016 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO/TS 16973:2016(E)

preferred but not necessarily required, or that (in the negative form) a certain possibility or course of

action is deprecated but not prohibited.”
vi © ISO 2016 – All rights reserved
---------------------- Page: 6 ----------------------
TECHNICAL SPECIFICATION ISO/TS 16973:2016(E)
Respiratory protective devices — Classification for
respiratory protective device (RPD), excluding RPD for
underwater application
1 Scope

This Technical Specification specifies the classification of Respiratory Protective Devices based on

their performance. The performance requirements are given in the relevant performance standards.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 16900-1, Respiratory protective devices — Methods of test and test equipment — Part 1: Determination

of inward leakage

ISO 16900-3, Respiratory protective devices — Methods of test and test equipment — Part 3: Determination

of particle filter penetration

ISO 16900-12, Respiratory protective devices — Methods of test and test equipment — Part 12:

Determination of volume-averaged work of breathing and peak respiratory pressures

ISO 16972, Respiratory protective devices — Terms, definitions, graphical symbols and units of

measurement

ISO/TS 16976-1, Respiratory protective devices — Human factors — Part 1: Metabolic rates and respiratory

flow rates

ISO 17420-3, Respiratory protective devices — Performance requirements — Part 3: Thread connection

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 16972 apply.

4 Mode of operation

There are two modes of operation that RPD may employ to supply breathable gas to the wearer. These

modes are specified in Table 1.
Table 1 — Mode of operation

Mode of operation Means of providing breathable gas to the wearer Typical examples of RPD

The RPD supplies the wearer with breathable gas Compressed airline breath-

Breathable gas supply from a remote supply of breathable gas or from ing apparatus, self-contained

breathable gas stored in, or regenerated by, the RPD. breathing apparatus (SCBA)
The RPD removes gases, vapours and/or particles
Half mask with gas filter(s)
from the ambient air depending on the air-purifying
Filtration
element (filter) used. These can be assisted or unas-
Filtering facepiece
sisted devices.
© ISO 2016 – All rights reserved 1
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ISO/TS 16973:2016(E)

Combined RPD are devices which have both filtration and breathable gas supply modes. Combined RPD

can have different classes depending on the operating method being used. An example will be an RPD

which can operate as a compressed airline breathing apparatus and has an auxiliary filter.

Multi-functional RPD are RPD which have different methods of operation within either filtration or

breathable gas supply modes.

Multi-functional RPD can have different classes depending on the operating method being used.

An example would be an RPD which can operate as a compressed airline breathing apparatus with an

auxiliary self-contained breathing apparatus. Another example is an assisted filtering RPD which can

operate as an unassisted filtering RPD when not powered.

The performance requirements for breathable gas supply RPD and filtering RPD are specified in the

relevant performance standards.
5 Protection classes (PC)
RPD shall be classified by Protection Class.

The Protection classes are derived from the results of a laboratory Total Inward Leakage (TIL) test in

accordance with ISO 16900-1 and the relevant performance standards. These classes are provided in

Table 2.
Table 2 — Protection classes
TIL
MAX
Protection Class
PC1 20
PC2 5
PC3 1
PC4 0,1
PC5 0,01
PC6 0,001

NOTE TIL is the ratio of the concentration of a test agent in the breathing zone inside the RPD compared

with the concentration outside the RPD, expressed as a percentage. This is the level of total inward leakage of

the RPD as measured in the laboratory under standard defined conditions. TIL levels used in RPD evaluation are

given in Table 2 and Figure A.1.
6 Work rate

RPD shall be classified by Work rate class, as determined by the RPD manufacturer. The Work rate

classes are derived from the results of a laboratory test, Work of breathing, and the related performance

requirement, in accordance with ISO 16900-12 and the relevant performance standards.

These classes are
— W4, which is equivalent to ISO/TS 16976-1 work class 8 (maximal),

— W3, which encompasses ISO/TS 16976-1 work classes 7 and 6 (extremely heavy and very-very heavy),

— W2 which encompasses ISO/TS 16976-1 work classes 5 and 4 (very heavy and heavy), and

— W1, which encompasses ISO/TS 16976-1 work classes 3, 2 and 1 (moderate and light).

For further information, see Annex D. RPD designated for special applications may have performance

requirements with minimum work rate classes.
2 © ISO 2016 – All rights reserved
---------------------- Page: 8 ----------------------
ISO/TS 16973:2016(E)
7 Respiratory interface class

Respiratory interfaces shall be classified by coverage area [see Figure E.1, a) to e)].

Respiratory interfaces shall be further classified by type: tight fitting; those that form a seal with the

wearer’s skin, and loose fitting, those that have a partial seal or no seal with the skin of the wearer. See

Table 3, Figure A.1 and Figure E.1.
Table 3 — Respiratory interface classes
RI Class RI area Type
eL e - more than head, up to complete body L-Loose fitting
eT e - more than head, up to complete body T-Tight fitting
dL d - Head L-Loose fitting
dT d - Head T-Tight fitting
cL c - Face L-Loose fitting
cT c - Face T-Tight fitting
bL b - Nose and mouth L-Loose fitting
bT b - Nose and mouth T-Tight fitting
aL a - Mouth only L-Loose fitting
aT a - Mouth only T-Tight fitting
8 Supplied breathable gas RPD capacity class

Supplied breathable gas RPD that have a fixed volume of breathable gas (self-contained) shall be

classified by the volume of breathable gas available for respiration and shall be designated by the

letter “S” followed by the gas capacity in litres rounded down to increments of 150 l up to 900 l and

increments of 300 l above 900 l.

Supplied breathable gas RPD that have an external supply of breathable gas shall be classified and

marked “SY”.
Gas Capacity classification of these devices is shown in Table 4 and Figure A.2.
Table 4 — Supplied breathable gas capacity
Gas capacity
Class
Sxxxx Where xxxx is the available breathable gas volume for respiration
SY Air supply from an external source (air line supplied)
9 Filter class
9.1 Particle filter class
Particle filters shall be classified by their efficiency and work rate.
9.1.1 Particle filter efficiency

Five classes of particle filter efficiency are defined ranging from very low efficiency to extremely high

efficiency. Table 5 and Figure A.3 list the filter classes and their minimum filter efficiency as determined

in laboratory filter efficiency tests in accordance with ISO 16900-3 by testing at the relevant flowrate in

accordance with the work rate class.
© ISO 2016 – All rights reserved 3
---------------------- Page: 9 ----------------------
ISO/TS 16973:2016(E)
Table 5 — Particle filter class
Particle filter efficiency
Class
F1 ≥80,00
F2 ≥95,00
F3 ≥99,00
F4 ≥99,90
F5 ≥99,99
9.1.2 Particle filter work rate class

Particle filters shall be additionally classified by work rate and are also marked with a lower case “w”

and the work rate class number, i.e. “w1”, “w2”, “w3” or “w4” after the efficiency and/or capacity class.

9.2 Gas filter class
9.2.1 General

A gas filter shall be classified by type (kind of gases), class (based on gas capacity) and work rate.

A given gas filter can be of one type only or a multiple type.
9.2.2 Gas filter capacity

A gas filter is classified by its capacity to remove the contaminants and is tested at different

concentrations depending on the class (1, 2, 3, and 4) and different flows depending on the work rate.

Some filters are for many contaminants within a category, e.g. organic vapours, and others for specific

gases or vapours, e.g. Arsine. Up to four capacity classes are defined depending on the filter type as

shown in Table 6, Table 7 and Figure A.3.
Table 6 — Gas filter types and classes
Type Classes Type description Typical contaminants
C H (Toluene)
7 8
OV 1, 2, 3 or 4 Organic vapour
C H (Cyclohexane)
6 12
C H O (Acetone)
3 6
Organic gas
OG 1 C H (Isobutane)
4 10
(low boiling, i.e. below 65 °C)
C H O (Dimethylether)
2 6
Cl (Chlorine)
H S (Hydrogen sulphide)
AC 1, 2, 3 or 4 Acidic compounds
HCl (Hydrogen chloride)
SO (Sulfur dioxide)
NH , (Ammonia)
BC 1, 2, 3 or 4 Basic compounds
CH NH (Methylamine)
3 2
NOX 1, 2, or 3 Nitrogen oxides NO (Nitrogen oxides)
4 © ISO 2016 – All rights reserved
---------------------- Page: 10 ----------------------
ISO/TS 16973:2016(E)
Table 7 — Specific gas filter types and classes
Type Classes Gas or vapour
ND 1, 2 or 3 Nitrogen dioxide (NO )
HG 1, 2 or 3 Mercury (Hg)
OZ 1 Ozone (O )
HCN 1, 2, 3 or 4 Hydrogen Cyanide (HCN)
AH 1 Arsine (AsH )
HF 1, 2 or 3 Hydrogen fluoride (HF)
CD 1 Chlorine dioxide (ClO )
ETO 1 or 2 Ethylene oxide ((CH ) O)
2 2
FM 1, 2 or 3 Formaldehyde (CH O)
MB 1, 2 or 3 Methylbromide (CH Br)
Three classes based on time
CO Carbon monoxide (CO)
(20 min, 60 min or 180 min)
PH 1 or 2 Phosphine (PH )
9.2.3 Gas filter work rate class

Gas filters shall be additionally classified by work rate and are also marked with a lower case “w” and

the work rate class number, i.e. “w1”, “w2”, ”w3” or “w4”, after the efficiency and/or capacity class.

10 RPD using standardized connector

Some complete RPD include respiratory interfaces and filters with standardized connectors in

accordance with ISO 17420-3, to allow interchangeability. Limitations to classes apply as specified in

the relevant performance standard.

A respiratory interface and filter with standardized connector is marked with their classification, also

as specified in the relevant performance standard. The symbol for Standardized connector, ⊚, is added

to the marking. Filters with standardized connectors are validated for work rate class w1 or w2.

11 Special application class
11.1 General

Special applications specify different areas of RPD use with specific performance requirements.

Minimum Protection class (PC) and Work rate class (W) are set in accordance with the relevant

performance standards and are specified in 11.2 to 11.8. These classes shall be met in order to be

classified for the special application. Higher PC and W classes are not excluded.

Special applications include
— Firefighting,
— CBRN,
— Marine,
— Mining,
— Abrasive blasting,
— Welding, and
— Escape.
© ISO 2016 – All rights reserved 5
---------------------- Page: 11 ----------------------
ISO/TS 16973:2016(E)
Special application devices are designated by alpha-numeric designation.

RPD to be used in special applications will be required to comply with additional performance

requirements (e.g. additional resistance to heat and flame for RPD intended for use in firefighting).

11.2 Firefighting class

RPD for Firefighting are designated by the respective RPD classifications followed by FF and the

numeric designation for specific firefighting application. These specific applications are wildland

firefighting, rescue, hazardous materials and structural firefighting. See Table 8 and Figure A.4.

Table 8 — Firefighting classes
Minimum Minimum work
Class Application
protection class rate class
FF5 Structural firefighting Type R2 PC5 W4
FF4 Structural firefighting Type R1 PC5 W3
FF3 Hazardous materials PC5 W3
FF2 Rescue PC4 W3
FF1 Wildland firefighting PC3 W2

Type R2 includes higher level of thermal exposure than Type R1 according to ISO 11999-1.

11.3 Chemical, biological, radiological and nuclear class

RPD for CBRN are designated by the respective RPD classifications followed by and the numeric

designation for specific CBRN application. See Table 9 and Figure A.4.
Table 9 — Chemical, biological, radiological and nuclear classes
Class Application Minimum protection class Minimum work rate class
CBRN 3 First on-scene responder PC5 W3
Responder
CBRN 2 PC5 W1
(known threat environment)
CBRN 1 Receiver/first receiver PC4 W1
11.4 Marine class

RPD for Marine are designated by the respective RPD classifications followed by MA and the numeric

designation for specific Marine application. These specific applications are firefighting and hazardous

materials. See Table 10 and Figure A.4.
Table 10 — Marine classes
Minimum protec- Minimum work
Class Application
tion class rate class
MA2 Marine firefighting W4
PC5
MA1 Hazardous materials W3
11.5 Mining class

RPD for Mining are designated by the respective RPD classifications followed by MN followed by the

numeric designation for specific Mining application. These specific applications are: Underground

non-explosive atmosphere, Underground explosive atmosphere and Firefighting. See Table 11 and

Figure A.4.
6 © ISO 2016 – All rights reserved
---------------------- Page: 12 ----------------------
ISO/TS 16973:2016(E)
Table 11 — Mining classes
Minimum protection Minimum work
Class Application
class rate class
MN4 Mining Firefighting and Rescue Type R2 PC5 W4
MN3 Mining Firefighting and Rescue Type R1 PC4 W2
MN2 Underground mining explosive
PC1 W2
MN1 Underground mining non-explosive

Type R2 includes higher level of thermal exposure than Type R1 according to ISO 11999-1.

11.6 Abrasive blasting class

RPD for abrasive blasting are designated by the respective RPD classifications followed by AB followed

by the numeric designation for specific abrasive blasting application. Currently, only one numeric

designation has been identified. See Table 12 and Figure A.4.
Table 12 — Abrasive blasting class
Minimum protection Minimum work
Class Application
class rate class
AB Abrasive blasting PC3 W1
11.7 Welding class

RPD for welding are designated by the respective RPD classifications followed by WE. See Table 13 and

Figure A.4.
Table 13 — Welding class
Minimum protection Minimum work
Class Application
class rate class
WE Welding PC1 W1
11.8 Escape class

RPD for escape only are designated by the respective RPD classifications followed by ES and the specific

application and the duration in minutes. Escape RPD can be filtering or supplied breathable gas devices.

Escape general Filtering RPD are designated by ES followed the gas filter type, e.g. ES OV (t).

Escape general, supplied breathable gas RPD, are not designated for a specific contaminant. See

Table 14, Table 15 and Figure A.4.
© ISO 2016 – All rights reserved 7
---------------------- Page: 13 ----------------------
ISO/TS 16973:2016(E)
Table 14 — Escape classes
Minimum
Minimum work
Class Application Duration protection
rate class
class
ES MN t Mining Escape
ES MA t Marine Escape
ES CBRN t CBRN Escape
t PC3 W1
ES FF t Escape from fire
ES XX t Escape general filtering RPD
ES t Escape general supplied breathable gas RPD
XX is the type of gas filter.
The “t” values in the table above are listed in Table 15.
Table 15 — Designated durations
“t” - Designated duration (minutes) Steps
5 to 30 (5, 10,15, 20, 25, 30) 5 min
30 to 60 (40, 50, 60) 10 min
60 to 120 (90, 120) 30 min
120 and above (180, 240…) 60 min
12 Sequence of marking information
12.1 Sequence of marking-supplied breathable gas RPD
The sequence of classification marking is as follows:
— protection class;
— work rate;
— respiratory interface;
— supplied breathable gas capacity;
— special application.
For examples of marking, see Annex B.
12.2 Sequence of marking-filtering RPD
The sequence of classification marking is as follows:
— protection class;
— work rate;
— respiratory interface;
— particle filter, if applicable;
— gas filter, if applicable;
— special application, if applicable.
For examples of marking, see Annex B.
8 © ISO 2016 – All rights reserved
---------------------- Page: 14 ----------------------
ISO/TS 16973:2016(E)
12.3 Sequence of marking-filter
The sequence of classification marking is as follows:
— particle filter, if applicable;
— gas filter, if applicable;
— work rate in lower case w;
— special application, if applicable.
For examples of marking, see Anne
...

TECHNICAL ISO/TS
SPECIFICATION 16973
First edition
Respiratory protective devices —
Classification for respiratory
protective device (RPD), excluding
RPD for underwater application
Appareils de protection respiratoire — Classification pour les APR, à
l’exclusion des APR pour application sous-marine
PROOF/ÉPREUVE
Reference number
ISO/TS 16973:2016(E)
ISO 2016
---------------------- Page: 1 ----------------------
ISO/TS 16973:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/TS 16973:2016(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Mode of operation ............................................................................................................................................................................................... 1

5 Protection classes (PC) ................................................................................................................................................................................... 2

6 Work rate ...................................................................................................................................................................................................................... 2

7 Respiratory interface class ........................................................................................................................................................................ 3

8 Supplied breathable gas RPD capacity class ............................................................................................................................ 3

9 Filter class.................................................................................................................................................................................................................... 3

9.1 Particle filter class ................................................................................................................................................................................ 3

9.1.1 Particle filter efficiency .............................................................................................................................................. 4

9.1.2 Particle filter work rate class ................................................................................................................................ 4

9.2 Gas filter class .......................................................................................................................................................................................... 4

9.2.1 General...................................................................................................................................................................................... 4

9.2.2 Gas filter capacity ............................................................................................................................................................ 4

10 RPD using standardized connector ................................................................................................................................................... 5

11 Special application class ............................................................................................................................................................................... 5

11.1 General ........................................................................................................................................................................................................... 5

11.2 Firefighting class ................................................................................................................................................................................... 6

11.3 Chemical, biological, radiological and nuclear class ............................................................................................... 6

11.4 Marine class ............................................................................................................................................................................................... 6

11.5 Mining class ............................................................................................................................................................................................... 7

11.6 Abrasive blasting class ..................................................................................................................................................................... 7

11.7 Welding class ............................................................................................................................................................................................ 7

11.8 Escape class ............................................................................................................................................................................................... 7

12 Sequence of marking information ..................................................................................................................................................... 8

12.1 Sequence of marking-supplied breathable gas RPD ............................................................................................... 8

12.2 Sequence of marking-filtering RPD ....................................................................................................................................... 8

12.3 Sequence of marking-filter ........................................................................................................................................................... 9

12.4 Sequence of marking-respiratory interface using standardized connector....................................... 9

12.5 Sequence of marking-filters using standardized connector ............................................................................ 9

Annex A (normative) Classification and related marking scheme overview ..........................................................10

Annex B (informative) Examples for ISO classification and related marking.........................................................15

Annex C (informative) Special applications ...............................................................................................................................................24

Annex D (informative) Protection levels .......................................................................................................................................................26

Annex E (informative) Work rate class ............................................................................................................................................................31

Annex F (informative) Respiratory interface class .............................................................................................................................33

Bibliography .............................................................................................................................................................................................................................35

© ISO 2016 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO/TS 16973:2016(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.

ISO/TS 16973 was prepared by Technical Committee ISO/TC 94, Personal safety — Protective clothing

and equipment, Subcommittee SC 15, Respiratory protective devices.
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ISO/TS 16973:2016(E)
Introduction

This Technical Specification contains the classification of Respiratory Protective Devices (RPD) and the

related marking in accordance with the requirements of the performance standards.

The basic classification, which applies to all RPD, will be marked in the following order:

a) protection class;
b) work rate class;
c) respiratory interface class.
Some examples for marking of commonly known RPD are included in Annex B.

For Supplied Breathable Gas RPD, the classification also includes gas capacity class.

For Filtering RPD, the classification also includes a particle filter class and/or the gas filter types and

classes.

RPD designated to be used for Special Applications are further classified accordingly.

The special applications identified are
— firefighting,
— chemical, biological, radiological and nuclear (CBRN),
— marine,
— mining,
— abrasive blasting,
— welding, and
— escape.

Each RPD will have an individual classification based on its performance specified in the relevant

performance standards.

Explanations of the classification and examples of the classification of RPD are given in the Annexes.

The following definitions apply in understanding how to implement an ISO International Standard and

other normative ISO deliverables (TS, PAS, IWA):
— “shall” indicates a requirement;
— “should” indicates a recommendation;
— “may” is used to indicate that something is permitted;

— “can” is used to indicate that something is possible, for example, that an organization or individual

is able to do something.

3.3.1 of the ISO/IEC Directives, Part 2 (sixth edition, 2011) defines a requirement as an “expression in

the content of a document conveying criteria to be fulfilled if compliance with the document is to be

claimed and from which no deviation is permitted.”

3.3.2 of the ISO/IEC Directives, Part 2 (sixth edition, 2011) defines a recommendation as an “expression

in the content of a document conveying that among several possibilities one is recommended as

particularly suitable, without mentioning or excluding others, or that a certain course of action is

© ISO 2016 – All rights reserved PROOF/ÉPREUVE v
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ISO/TS 16973:2016(E)

preferred but not necessarily required, or that (in the negative form) a certain possibility or course of

action is deprecated but not prohibited.”
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TECHNICAL SPECIFICATION ISO/TS 16973:2016(E)
Respiratory protective devices — Classification for
respiratory protective device (RPD), excluding RPD for
underwater application
1 Scope

This Technical Specification specifies the classification of Respiratory Protective Devices based on

their performance. The performance requirements are given in the relevant performance standards.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 16900-1, Respiratory protective devices — Methods of test and test equipment — Part 1: Determination

of inward leakage

ISO 16900-3, Respiratory protective devices — Methods of test and test equipment — Part 3: Determination

of particle filter penetration

ISO 16900-12, Respiratory protective devices — Methods of test and test equipment — Part 12:

Determination of volume-averaged work of breathing and peak respiratory pressures

ISO 16972, Respiratory protective devices — Terms, definitions, graphical symbols and units of measurement

ISO/TS 16976-1, Respiratory protective devices — Human factors — Part 1: Metabolic rates and

respiratory flow rates

ISO 17420-3, Respiratory protective devices — Performance requirements — Part 3: Thread connection

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 16972 apply.

4 Mode of operation

There are two modes of operation that RPD may employ to supply breathable gas to the wearer. These

modes are specified in Table 1.
Table 1 — Mode of operation

Mode of operation Means of providing breathable gas to the wearer Typical examples of RPD

The RPD supplies the wearer with breathable gas Compressed airline breath-

Breathable gas supply from a remote supply of breathable gas or from ing apparatus, self-contained

breathable gas stored in, or regenerated by, the RPD. breathing apparatus (SCBA)
The RPD removes gases, vapours and/or particles
Half mask with gas filter(s)
from the ambient air depending on the air-purifying
Filtration
element (filter) used. These can be assisted or unas-
Filtering facepiece
sisted devices.
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ISO/TS 16973:2016(E)

Combined RPD are devices which have both filtration and breathable gas supply modes. Combined RPD

can have different classes depending on the operating method being used. An example will be an RPD

which can operate as a compressed airline breathing apparatus and has an auxiliary filter.

Multi-functional RPD are RPD which have different methods of operation within either filtration or

breathable gas supply modes.

Multi-functional RPD can have different classes depending on the operating method being used.

An example would be an RPD which can operate as a compressed airline breathing apparatus with an

auxiliary self-contained breathing apparatus. Another example is an assisted filtering RPD which can

operate as an unassisted filtering RPD when not powered.

The performance requirements for breathable gas supply RPD and filtering RPD are specified in the

relevant performance standards.
5 Protection classes (PC)
RPD shall be classified by Protection Class.

The Protection classes are derived from the results of a laboratory Total Inward Leakage (TIL)

test in accordance with ISO 16900-1 and the relevant performance standards. These classes are

provided in Table 2.
Table 2 — Protection classes
TIL
MAX
Protection Class
PC1 20
PC2 5
PC3 1
PC4 0,1
PC5 0,01
PC6 0,001

NOTE TIL is the ratio of the concentration of a test agent in the breathing zone inside the RPD compared

with the concentration outside the RPD, expressed as a percentage. This is the level of total inward leakage of

the RPD as measured in the laboratory under standard defined conditions. TIL levels used in RPD evaluation are

given in Table 2 and Figure A.1.
For further information, see informative Annex D.
6 Work rate

RPD shall be classified by Work rate class, as determined by the RPD manufacturer. The Work rate

classes are derived from the results of a laboratory test, Work of breathing, and the related performance

requirement, in accordance with ISO 16900-12 and the relevant performance standards.

These classes are
— W4, which is equivalent to ISO/TS 16976-1 work class 8 (maximal),

— W3, which encompasses ISO/TS 16976-1 work classes 7 and 6 (extremely heavy and very-very heavy),

— W2 which encompasses ISO/TS 16976-1 work classes 5 and 4 (very heavy and heavy), and

— W1, which encompasses ISO/TS 16976-1 work classes 3, 2 and 1 (moderate and light).

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ISO/TS 16973:2016(E)

For further information, see Annex E. RPD designated for special applications may have performance

requirements with minimum work rate classes.
7 Respiratory interface class

Respiratory interfaces shall be classified by coverage area [see Figure F.1, a) to e)].

Respiratory interfaces shall be further classified by type: tight fitting; those that form a seal with the

wearer’s skin, and loose fitting, those that have a partial seal or no seal with the skin of the wearer. See

Table 3, Figure A.1 and Figure F.1.
Table 3 — Respiratory interface classes
RI Class RI area Type
eL e - more than head, up to complete body L-Loose fitting
eT e - more than head, up to complete body T-Tight fitting
dL d - Head L-Loose fitting
dT d - Head T-Tight fitting
cL c - Face L-Loose fitting
cT c - Face T-Tight fitting
bL b - Nose and mouth L-Loose fitting
bT b - Nose and mouth T-Tight fitting
aL a - Mouth only L-Loose fitting
aT a - Mouth only T-Tight fitting
8 Supplied breathable gas RPD capacity class

Supplied breathable gas RPD that have a fixed volume of breathable gas (self-contained) shall be

classified by the volume of breathable gas available for respiration and shall be designated by the

letter “S” followed by the gas capacity in litres rounded down to increments of 150 l up to 900 l and

increments of 300 l above 900 l.

Supplied breathable gas RPD that have an external supply of breathable gas shall be classified and

marked “SY”.
Gas Capacity classification of these devices is shown in Table 4 and Figure A.2.
Table 4 — Supplied breathable gas capacity
Gas capacity
Class
Sxxxx Where xxxx is the available breathable gas volume for respiration
SY Air supply from an external source (air line supplied)
9 Filter class
9.1 Particle filter class
Particle filters shall be classified by their efficiency and work rate.
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ISO/TS 16973:2016(E)
9.1.1 Particle filter efficiency

Five classes of particle filter efficiency are defined ranging from very low efficiency to extremely high

efficiency. Table 5 and Figure A.3 list the filter classes and their minimum filter efficiency as determined

in laboratory filter efficiency tests in accordance with ISO 16900-3 by testing at the relevant flowrate in

accordance with the work rate class.
Table 5 — Particle filter class
Particle filter efficiency
Class
F1 ≥80,00
F2 ≥95,00
F3 ≥99,00
F4 ≥99,90
F5 ≥99,99
9.1.2 Particle filter work rate class

Particle filters are classified by work rate and are also marked with a lower case “w” and the work rate

class number, i.e. “w1”, “w2”, “w3” or “w4” after the efficiency and/or capacity class.

9.2 Gas filter class
9.2.1 General

A gas filter shall be classified by type (kind of gases), class (based on gas capacity) and work rate.

A given gas filter can be of one type only or a multiple type.
9.2.2 Gas filter capacity

A gas filter is classified by its capacity to remove the contaminants and is tested at different

concentrations depending on the class (1, 2, 3, and 4) and different flows depending on the work rate.

Some filters are for many contaminants within a category, e.g. organic vapours, and others for specific

gases or vapours, e.g. Arsine. Up to four capacity classes are defined depending on the filter type as

shown in Table 6, Table 7 and Figure A.3. Gas filter work rate class.

Gas filters are classified by work rate and are also marked with a lower case “w” and the work rate class

number, i.e. “w1”, “w2”, ”w3” or “w4”, after the efficiency and/or capacity class.

Table 6 — Gas filter types and classes
Type Classes Type description Typical contaminants
C H (Toluene)
7 8
OV 1, 2, 3 or 4 Organic vapour
C H (Cyclohexane)
6 12
C H O (Acetone)
3 6
Organic gas
OG 1 C H (Isobutane)
4 10
(low boiling, i.e. below 65 °C)
C H O (Dimethylether)
2 6
Cl (Chlorine)
H S (Hydrogen sulphide)
AC 1, 2, 3 or 4 Acidic compounds
HCl (Hydrogen chloride)
SO (Sulfur dioxide)
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ISO/TS 16973:2016(E)
Table 6 (continued)
Type Classes Type description Typical contaminants
NH , (Ammonia)
BC 1, 2, 3 or 4 Basic compounds
CH NH (Methylamine)
3 2
NOX 1, 2, or 3 Nitrogen oxides NO (Nitrogen oxides)
Table 7 — Specific gas filter types and classes
Type Classes Gas or vapour
ND 1, 2 or 3 Nitrogen dioxide (NO )
HG 1, 2 or 3 Mercury (Hg)
OZ 1 Ozone (O )
HCN 1, 2, 3 or 4 Hydrogen Cyanide (HCN)
AH 1 Arsine (AsH )
HF 1, 2 or 3 Hydrogen fluoride (HF)
CD 1 Chlorine dioxide (ClO )
ETO 1 or 2 Ethylene oxide ((CH ) O)
2 2
FM 1, 2 or 3 Formaldehyde (CH O)
MB 1, 2 or 3 Methylbromide (CH Br)
Three classes based on time
CO Carbon monoxide (CO)
(20 min, 60 min or 180 min)
PH 1 or 2 Phosphine (PH )
10 RPD using standardized connector

Some complete RPD include respiratory interfaces and filters with standardized connectors in

accordance with ISO 17420-3, to allow interchangeability. Limitations to classes apply as specified in

the relevant performance standard.

A respiratory interface and filter with standardized connector is marked with their classification, also

as specified in the relevant performance standard. The symbol for Standardized connector, ⊚, is added

to the marking. Filters with standardized connectors are validated for work rate class w1 or w2.

11 Special application class
11.1 General

Special applications specify different areas of RPD use with specific performance requirements.

Minimum Protection class (PC) and Work rate class (W) are set in accordance with the relevant

performance standards and are specified in 11.2 to 11.8. These classes shall be met in order to be

classified for the special application. Higher PC and W classes are not excluded.

Special applications include
— firefighting,
— CBRN,
— marine,
— mining,
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ISO/TS 16973:2016(E)
— abrasive blasting,
— welding, and
— escape.
Special application devices are designated by alpha-numeric designation.

RPD to be used in special applications will be required to comply with additional performance

requirements (e.g. additional resistance to heat and flame for RPD intended for use in firefighting).

11.2 Firefighting class

RPD for Firefighting are designated by the respective RPD classifications followed by FF and the

numeric designation for specific firefighting application. These specific applications are wildland

firefighting, rescue, hazardous materials and structural firefighting. See Table 8 and Figure A.4.

Table 8 — Firefighting classes
Minimum Minimum work
Class Application
protection class rate class
FF5 Structural firefighting Type R2 PC5 W4
FF4 Structural firefighting Type R1 PC5 W3
FF3 Hazardous materials PC5 W3
FF2 Rescue PC4 W3
FF1 Wildland firefighting PC3 W2

Type R2 includes higher level of thermal exposure than Type R1 according to ISO 11999-1.

11.3 Chemical, biological, radiological and nuclear class

RPD for CBRN are designated by the respective RPD classifications followed by and the numeric

designation for specific CBRN application. See Table 9 and Figure A.4.
Table 9 — Chemical, biological, radiological and nuclear classes
Class Application Minimum protection class Minimum work rate class
CBRN 3 First on-scene responder PC5 W3
Responder
CBRN 2 PC5 W1
(known threat environment)
CBRN 1 Receiver/first receiver PC4 W1
11.4 Marine class

RPD for Marine are designated by the respective RPD classifications followed by MA and the numeric

designation for specific Marine application. These specific applications are firefighting and hazardous

materials. See Table 10 and Figure A.4.
Table 10 — Marine classes
Minimum protection Minimum work rate
Class Application
class class
MA2 Marine firefighting W4
PC5
MA1 Hazardous materials W3
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ISO/TS 16973:2016(E)
11.5 Mining class

RPD for Mining are designated by the respective RPD classifications followed by MN followed by the

numeric designation for specific Mining application. These specific applications are: Underground non-

explosive atmosphere, Underground explosive atmosphere and Firefighting. See Table 11 and Figure A.4.

Table 11 — Mining classes
Minimum protection Minimum work
Class Application
class rate class
MN4 Mining Firefighting and Rescue Type R2 PC5 W4
MN3 Mining Firefighting and Rescue Type R1 PC4 W2
MN2 Underground mining explosive
PC1 W2
MN1 Underground mining non-explosive

Type R2 includes higher level of thermal exposure than Type R1 according to ISO 11999-1.

11.6 Abrasive blasting class

RPD for abrasive blasting are designated by the respective RPD classifications followed by AB followed

by the numeric designation for specific abrasive blasting application. Currently, only one numeric

designation has been identified. See Table 12 and Figure A.4.
Table 12 — Abrasive blasting class
Minimum protection Minimum work
Class Application
class rate class
AB Abrasive blasting PC3 W1
11.7 Welding class

RPD for welding are designated by the respective RPD classifications followed by WE. See Table 13

and Figure A.4.
Table 13 — Welding class
Minimum protection Minimum work
Class Application
class rate class
WE Welding PC1 W1
11.8 Escape class

RPD for escape only are designated by the respective RPD classifications followed by ES and the specific

application and the duration in minutes. Escape RPD can be filtering or supplied breathable gas devices.

Escape general Filtering RPD are designated by ES followed the gas filter type, e.g. ES OV (t).

Escape general, supplied breathable gas RPD, are not designated for a specific contaminant. See

Table 14, Table 15 and Figure A.4.
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ISO/TS 16973:2016(E)
Table 14 — Escape classes
Minimum
Minimum work
Class Application Duration protection
rate class
class
ES MN t Mining Escape
ES MA t Marine Escape
ES CBRN t CBRN Escape
t PC3 W1
ES FF t Escape from fire
ES XX t Escape general filtering RPD
ES t Escape general supplied breathable gas RPD
XX is the type of gas filter.
The “t” values in the table above are listed in Table 15.
Table 15 — Designated durations
“t” - Designated duration (minutes) Steps
5 to 30 (5, 10,15, 20, 25, 30) 5 min
30 to 60 (40, 50, 60) 10 min
60 to 120 (90, 120) 30 min
120 and above (180, 240…) 60 min
12 Sequence of marking information
12.1 Sequence of marking-supplied breathable gas RPD
The sequence of classification marking is as follows:
— protection class;
— work rate;
— respiratory interface;
— supplied breathable gas capacity;
— special application.
For examples of marking, see Annex B.
12.2 Sequence of marking-filtering RPD
The sequence of classification marking is as follows:
— protection class;
— work rate;
— respiratory interface;
— particle filter, if applicable;
— gas filter, if applicable;
— special application, if applicable.
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ISO/TS 16973:2016(E)
For examples of marking, see Anne
...

DRAFT INTERNATIONAL STANDARD
ISO/DIS 16973
ISO/TC 94/SC 15 Secretariat: DIN
Voting begins on: Voting terminates on:
2014-11-24 2015-02-24
Respiratory protective devices — Classification for
respiratory protective device (RPD), excluding RPD for
underwater application

Appareils de protection respiratoire — Classification pour les DPR, à l’exclusion des DPR pour application

sous-marine
ICS: 13.340.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 16973:2014(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2014
---------------------- Page: 1 ----------------------
ISO/DIS 16973:2014(E)
Copyright notice

This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as

permitted under the applicable laws of the user’s country, neither this ISO draft nor any extract

from it may be reproduced, stored in a retrieval system or transmitted in any form or by any means,

electronic, photocopying, recording or otherwise, without prior written permission being secured.

Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s

member body in the country of the requester.
ISO copyright office
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2014 – All rights reserved
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ISO/DIS 16973
Contents Page

Foreword ........................................................................................................................................................... vii

Introduction ...................................................................................................................................................... viii

1 Scope ...................................................................................................................................................... 1

2 Normative references ............................................................................................................................ 1

3 Terms and definitions ........................................................................................................................... 1

4 Mode of operation ................................................................................................................................. 1

5 Protection classes ................................................................................................................................. 2

5.1 Total Inward Leakage (TIL) ................................................................................................................... 2

5.2 Protection class (PC) ............................................................................................................................ 2

6 Work rate ................................................................................................................................................ 3

7 Respiratory interface class................................................................................................................... 4

8 Supplied breathable gas RPD capacity class ..................................................................................... 4

9 Filter class .............................................................................................................................................. 5

9.1 Particle filter class ................................................................................................................................. 5

9.1.1 Particle filter efficiency ......................................................................................................................... 5

9.1.2 Particle filter work rate class ................................................................................................................ 5

9.2 Gas filter Class ...................................................................................................................................... 5

9.2.1 Gas filter capacity .................................................................................................................................. 6

9.2.2 Gas filter work rate class ...................................................................................................................... 6

10 Class of RPD using standardized connector...................................................................................... 7

11 Special Application class ..................................................................................................................... 7

11.1 General ................................................................................................................................................... 7

11.2 Firefighting class ................................................................................................................................... 7

11.3 Chemical, Biological Radiological and Nuclear class ....................................................................... 8

11.4 Marine class ........................................................................................................................................... 8

11.5 Mining class ........................................................................................................................................... 8

11.6 Abrasive blasting class ......................................................................................................................... 8

11.7 Welding class ......................................................................................................................................... 9

11.8 Escape class .......................................................................................................................................... 9

12 Marking sequence ................................................................................................................................. 9

12.1 Sequence of supplied breathable gas RPD classification marking ................................................. 9

12.2 Sequence of filtering RPD classification marking ........................................................................... 10

12.3 Sequence of filter classification marking ......................................................................................... 10

12.4 Sequence of classification marking for respiratory interface using standardized

connector ............................................................................................................................................. 10

12.5 Sequence of Filter classification marking for filters using standardized connector ................... 11

Annex A (normative) Classification scheme overview ................................................................................ 12

Annex B (informativ) Examples for ISO classification and marking .......................................................... 17

B.1 General ................................................................................................................................................. 17

B.1.1 Example A ............................................................................................................................................ 17

B.1.2 Example B ............................................................................................................................................ 17

B.1.3 Example C ............................................................................................................................................ 18

B.1.4 Example D ............................................................................................................................................ 18

B.1.5 Example E ............................................................................................................................................ 18

B.1.6 Example F ............................................................................................................................................. 19

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ISO/DIS 16973

B.1.7 Example G ........................................................................................................................................... 19

B.1.8 Example H ............................................................................................................................................ 19

B.1.9 Example I ............................................................................................................................................. 19

B.1.10 Example J ............................................................................................................................................ 20

B.1.11 Example K ............................................................................................................................................ 20

B.1.12 Example L ............................................................................................................................................ 21

B.1.13 Example M ........................................................................................................................................... 21

B.1.14 Example N ............................................................................................................................................ 21

B.1.15 Example O ........................................................................................................................................... 22

B.1.16 Example P — A number of assisted filtering RPD using various respiratory interfaces and

various filters ...................................................................................................................................... 23

B.1.17 Example Q — A number of supplied breathable gas RPD using various respiratory

interfaces and other components ..................................................................................................... 24

Annex C (informative) Special Applications ................................................................................................ 25

Annex D (informative) Protection levels....................................................................................................... 27

D.1 General ................................................................................................................................................. 27

D.2 Validation of protection levels ........................................................................................................... 27

D.3 Rationale used when preparing SF numbers .................................................................................. 28

D.3.1 General ................................................................................................................................................. 28

D.3.2 Class PC1 ............................................................................................................................................ 28

D.3.3 Class PC2 ............................................................................................................................................ 28

D.3.4 Class PC3 ............................................................................................................................................ 29

D.3.5 Class PC4 ............................................................................................................................................ 30

D.3.6 Class PC5 ............................................................................................................................................ 31

D.3.7 Class PC6 ............................................................................................................................................ 31

Annex E (informative) Respiratory Interfaces ............................................................................................. 32

Bibliography ..................................................................................................................................................... 34

Figures

Figure A.1 — Basic classification for all RPD .................................................................................................... 13

Figure A.2 — Supplied breathable gas capacity classification .......................................................................... 14

Figure A.3 — Filter classification ....................................................................................................................... 15

Figure A.4 — RPD classification for Special application ................................................................................... 16

Figure E.1 — Areas of coverage ....................................................................................................................... 33

Tables

Table 1 — Mode of operation .............................................................................................................................. 2

Table 2 — Total inward leakage levels ................................................................................................................ 2

Table 3 — Protection classes .............................................................................................................................. 3

Table 4 — Work rate class .................................................................................................................................. 4

Table 5 — Respiratory interface classes ............................................................................................................. 4

Table 6 — Supplied breathable gas capacity ...................................................................................................... 5

Table 7 — Particle filter class .............................................................................................................................. 5

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ISO/DIS 16973

Table 8 — Gas filter types and classes ................................................................................................................ 6

Table 9 — Specific gas filter types and classes ................................................................................................... 6

Table 10 — Firefighting classes ........................................................................................................................... 7

Table 11 — Chemical, Biological Radiological and Nuclear class ....................................................................... 8

Table 12 — Marine classes .................................................................................................................................. 8

Table 13 — Mining classes .................................................................................................................................. 8

Table 14 — Abrasive blasting classes ................................................................................................................. 8

Table 15 — Welding classes ................................................................................................................................ 9

Table 16 — Escape classes ................................................................................................................................. 9

Table 17 — Designated durations ........................................................................................................................ 9

Table B.1 — Example A ..................................................................................................................................... 17

Table B.2 — Example B ..................................................................................................................................... 17

Table B.3 — Example C ..................................................................................................................................... 18

Table B.4 — Example D ..................................................................................................................................... 18

Table B.5 — Example E ..................................................................................................................................... 18

Table B.6 — Example F ..................................................................................................................................... 19

Table B.7 — Example G ..................................................................................................................................... 19

Table B.8 — Example H ..................................................................................................................................... 19

Table B.9 — Example I ....................................................................................................................................... 19

Table B.10 — Example J .................................................................................................................................... 20

Table B.11 — Example K ................................................................................................................................... 20

Table B.12 — Example L .................................................................................................................................... 21

Table B.13 — Example M ................................................................................................................................... 21

Table B.14 — Example P ................................................................................................................................... 21

Table B.15 — Example O ................................................................................................................................... 22

Table B.16 — Configuration matrix assisted filtering RPD ................................................................................. 23

Table B.17 — Configuration matrix supplied breathable gas RPD .................................................................... 24

Table C.1 — Special Applications ...................................................................................................................... 25

Table D.1 — Protection level classes ................................................................................................................. 27

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ISO/DIS 16973

Table D.2 — Comparison of proposed ISO protection level for PC1 to current European protection factors .. 28

Table D.3 — Comparison of proposed ISO protection level for PC2 to current European protection factors .. 29

Table D.4 — Comparison of proposed ISO Protection level for PC3 to current European protection factors .. 30

Table D.5 — Comparison of proposed ISO protection level for PC4 to current European protection factors .. 30

Table D.6 — Comparison of proposed ISO protection level for PC5 to current European protection factors .. 31

Table D.7 — Comparison of proposed ISO protection level for PC5 to current European protection factors .. 31

vi © ISO 2014 – All rights reserved
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ISO/DIS 16973
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described

in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of

ISO documents should be noted. This document was drafted in accordance with the editorial rules of the

ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent

rights identified during the development of the document will be in the Introduction and/or on the ISO list of

patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,

as well as information about ISO's adherence to the WTO principles in the Technical Barriers to Trade (TBT)

see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 94, Personal safety — Protective clothing and

equipment, Subcommittee SC 15, Respiratory protective devices.
© ISO 2014 – All rights reserved vii
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ISO/DIS 16973
Introduction

This document contains the classification of Respiratory Protective Devices in accordance with the

requirements of ISO 17420-1 Supplied breathable gas RPD, ISO 17420-2 Filtering RPD, and ISO TS 17420-4

Chemical, Biological, Radiological and Nuclear RPD.

The Basic Classification, which apply to all RPD, are: Protection Class, Work rate class, and respiratory

interface class.

For Supplied Breathable Gas RPD the classification also includes gas capacity class.

For Filtering RPD, the classification also includes a particle filter class and/or the gas filter types and classes.

RPD designated to be used for Special Applications are further classified accordingly.

The special applications identified are:
 Fire Fighting,
 Chemical, Biological, Radiological and Nuclear (CBRN),
 Marine,
 Mining,
 Abrasive Blasting,
 Welding, and
 Escape.

Each RPD will have an individual classification based on its performance specified in ISO 17420-1, ISO

17420-2 or ISO TS 17420-4.

Explanations of the classification and examples of the classification of RPD are given in the Annexes.

The following definitions apply in understanding how to implement an ISO International Standard and other

normative ISO deliverables (TS, PAS, IWA).
 “shall” indicates a requirement
 “should” indicates a recommendation
 “may” is used to indicate that something is permitted

 “can” is used to indicate that something is possible, for example, that an organization or individual is able

to do something

3.3.1 of the ISO/IEC Directives, Part 2 (sixth edition, 2011) defines a requirement as an "expression in the

content of a document conveying criteria to be fulfilled if compliance with the document is to be claimed and

from which no deviation is permitted."

3.3.2 of the ISO/IEC Directives, Part 2 (sixth edition, 2011) defines a recommendation as an “expression in

the content of a document conveying that among several possibilities one is recommended as particularly

suitable, without mentioning or excluding others, or that a certain course of action is preferred but not

necessarily required, or that (in the negative form) a certain possibility or course of action is deprecated but

not prohibited.”
viii © ISO 2014 – All rights reserved
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Respiratory protective devices — Classification for respiratory
protective devices (RPD), excluding RPD for underwater
application
1 Scope

This Standard specifies the classification of Respiratory Protective Devices based on their performance. The

performance requirements are given in ISO 17420-1, -2 and -4
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.
ISO 16975-1, Respiratory protective devices – Selection, use and maintenance

ISO TS 16976-1:2007, Respiratory protective devices – Human factors Part 1: Metabolic rates and

Respiratory flow rates

ISO 16972:2010, Respiratory protective devices — Terms, definitions, graphical symbols and units of

measurement

ISO 16900-3 Respiratory protective devices - Methods of test and test equipment - Part 3: Determination of

filter penetration

ISO 17420-1 Respiratory protective devices – Performance requirements – Part 1: Supplied breathable gas

devices

ISO 17420-2 Respiratory protective devices – Performance requirements – Part 2: Filtering RPD

ISO 17420-3 Respiratory protective devices – Performance requirements – Part 3: Thread connection

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 16972 apply.

4 Mode of operation

The two means of supplying breathable gas to the wearer are described in Table 1.

1) Under preparation
© ISO 2014 – All rights reserved
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ISO/DIS 16973
Table 1 — Mode of operation

Mode of operation Means of supplying breathable gas to the wearer Typical examples of RPD

The RPD supplies the wearer with breathable gas from a Compressed airline breathing

Breathable gas supply remote supply of breathable gas or from breathable gas apparatus, self-contained

stored in, or regenerated by, the RPD. breathing apparatus (SCBA)
The RPD removes gases, vapours and/or particles from
Half mask with gas filter(s)
Filtration the ambient air depending on the air-purifying element
Filtering facepiece
(filter) used. These can be assisted or unassisted devices.

Combined RPD are devices which have both filtering and breathable gas supply modes. Combined RPD can

have different classes depending on the operating method being used. An example will be a RPD which can

operate as a compressed airline breathing apparatus and has an auxiliary filter.

Multi functional RPD are RPD which have different methods of operation within either filtering or breathable

gas supply modes. Multi-functional RPD can have different classes depending on the operating method being

used. An example would be an RPD which can operate as a compressed airline breathing apparatus with an

auxiliary self-contained breathing apparatus. Another example is a powered air-purifying respirator (PAPR)

which can operate with the blower in the power-off mode.
5 Protection classes
5.1 Total Inward Leakage (TIL)

TIL is the ratio of the concentration of a test agent in the breathing zone inside the RPD compared to the

concentration outside the RPD, expressed as a percentage.

This is the level of total inward leakage of the RPD as measured in the laboratory under standard defined

conditions.
TIL levels used in RPD evaluation are given in Table 2.
Table 2 — Total inward leakage levels
TIL
MAX
0,001
0,01
0,1
5.2 Protection class (PC)
RPD shall be classified by Protection Class.

The protection class are derived from the results of a laboratory Total Inward Leakage (TIL) test. The

protection classes are listed in Table 3 and Figure A.1 corresponding with the maximum percent TIL.

© ISO 2014 – All rights reserved
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ISO/DIS 16973
Table 3 — Protection classes
TIL
MAX
Protection Class
PC6 0,001
PC5 0,01
PC4 0,1
PC3 1
PC2 5
PC1 20

For the purposes of selection and use of an RPD, as described in ISO 16975-1, a protection level is assigned

to each PC, see Annex D.
6 Work rate
RPD shall be classified by work rate class.

The work rate is a measure of how hard a wearer is physically working expressed in the demand of breathable

gas per time period. The work rate therefore can be expressed as the amount of breathable gas needed by

the wearer for work, expressed in l/min of inhaled breathable gas.

The explanation of work rate and its associated class descriptions are given in ISO TS 16976-1.

Work rates in Table 4 and Figure A.1 are based on the mean work rates from ISO TS 16976-1, plus one

standard error, for a 2,1m body surface man. The numbers given in the work rate column of the classification

scheme are in minute volume.
Four work rate classes are designated for RPD.
They are class:
 W4, which
...

SPÉCIFICATION ISO/TS
TECHNIQUE 16973
Première édition
2016-04-01
Appareils de protection
respiratoire — Classification pour
les APR, à l’exclusion des APR pour
application sous-marine
Respiratory protective devices — Classification for respiratory
protective device (RPD), excluding RPD for underwater application
Numéro de référence
ISO/TS 16973:2016(F)
ISO 2016
---------------------- Page: 1 ----------------------
ISO/TS 16973:2016(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2016, Publié en Suisse

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ii © ISO 2016 – Tous droits réservés
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ISO/TS 16973:2016(F)
Sommaire  Page

Avant-propos ..............................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1  Domaine d’application ................................................................................................................................................................................... 1

2  Références normatives ................................................................................................................................................................................... 1

3  Termes et définitions ....................................................................................................................................................................................... 1

4  Mode de fonctionnement ............................................................................................................................................................................. 1

5 Classes de protection (PC) .......................................................................................................................................................................... 2

6  Rythme de travail ................................................................................................................................................................................................. 3

7 Classe d’interface respiratoire ............................................................................................................................................................... 3

8  Classe de capacité des APR alimentés en gaz respirable ............................................................................................ 3

9  Classe de filtre ......................................................................................................................................................................................................... 4

9.1 Classe de filtre à particules ........................................................................................................................................................... 4

9.1.1 Efficacité du filtre à particules ............................................................................................................................. 4

9.1.2 Classe de rythme de travail des filtres à particules ........................................................................... 4

9.2 Classe de filtre anti-gaz .................................................................................................................................................................... 4

9.2.1 Généralités ............................................................................................................................................................................ 4

9.2.2 Capacité des filtres anti-gaz ................................................................................................................................... 4

9.2.3 Classe de rythme de travail des filtres anti-gaz ..................................................................................... 5

10  APR utilisant un raccordement normalisé ................................................................................................................................ 5

11  Classe des applications particulières.............................................................................................................................................. 6

11.1 Généralités .................................................................................................................................................................................................. 6

11.2 Classe de lutte contre l’incendie .............................................................................................................................................. 6

11.3 Classe des risques chimiques, biologiques, radiologiques et nucléaires (CBRN) ......................... 6

11.4 Classe maritime ...................................................................................................................................................................................... 7

11.5 Classe d’applications minières .................................................................................................................................................. 7

11.6 Classe de projection d’abrasifs .................................................................................................................................................. 7

11.7 Classe de soudage ................................................................................................................................................................................. 8

11.8 Classe d’évacuation ............................................................................................................................................................................. 8

12  Séquence de marquage des informations .................................................................................................................................. 8

12.1 Séquence de marquage des APR alimentés en gaz respirable ....................................................................... 8

12.2 Séquence de marquage des APR filtrants ........................................................................................................................ 9

12.3 Séquence de marquage des filtres .......................................................................................................................................... 9

12.4 Séquence de marquage des interfaces respiratoires utilisant un raccordement normalisé 9

12.5 Séquence de marquage des filtres utilisant un raccordement normalisé ............................................ 9

Annexe A (normative) Présentation du schéma de classification et de marquage associé ......................11

Annexe B (informative) Exemples de classification ISO et marquage associé .......................................................16

Annexe C (informative) Applications particulières ............................................................................................................................25

Annexe D (informative) Classe de rythme de travail ........................................................................................................................27

Annexe E (informative) Classe d’interface respiratoire .................................................................................................................29

Bibliographie ...........................................................................................................................................................................................................................31

© ISO 2016 – Tous droits réservés iii
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ISO/TS 16973:2016(F)
Avant-propos

L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes

nationaux de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est

en général confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude

a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,

gouvernementales et non gouvernementales, en liaison avec l’ISO, participent également aux travaux.

L’ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui

concerne la normalisation électrotechnique.

Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont

décrites dans les Directives ISO/IEC, Partie 1.Il convient, en particulier de prendre note des différents

critères d’approbation requis pour les différents types de documents ISO. Le présent document a été

rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www.

iso.org/directives).

L’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de

droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable

de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant

les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de

l’élaboration du document sont indiqués dans l’Introduction et/ou dans la liste des déclarations de

brevets reçues par l’ISO (voir www.iso.org/brevets).

Les appellations commerciales éventuellement mentionnées dans le présent document sont données

pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un

engagement.

Pour une explication de la signification des termes et expressions spécifiques de l’ISO liés à

l’évaluation de la conformité, ou pour toute information au sujet de l’adhésion de l’ISO aux principes

de l’OMC concernant les obstacles techniques au commerce (OTC), voir le lien suivant: Avant-propos —

Informations supplémentaires.

L’ISO/TS 16973 a été élaborée par le comité technique ISO/TC 94, Sécurité individuelle — Vêtements et

équipements de protection, sous-comité SC 15, Appareils de protection respiratoire.

iv © ISO 2016 – Tous droits réservés
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ISO/TS 16973:2016(F)
Introduction

La présente Spécification technique contient la classification des appareils de protection respiratoire

(APR) et les marquages associés, conformément aux exigences des normes de performance.

La classification de base, qui s’applique à tous les APR, sera marquée dans l’ordre suivant:

a) classe de protection;
b) classe de rythme de travail;
c) classe d’interface respiratoire.

Quelques exemples de marquage d’APR généralement connus figurent dans l’Annexe B.

Pour les APR alimentés en gaz respirable, la classification couvre également une classe de capacité en gaz.

Pour les APR filtrants, la classification comprend également une classe de filtre à particules et/ou les

types et classes de filtres anti-gaz.

Les APR désignés pour des applications particulières sont également classés en conséquence.

Les applications particulières identifiées sont les suivantes:
— lutte contre l’incendie;
— applications chimiques, biologiques, radiologiques et nucléaires (CBRN);
— applications maritimes;
— applications minières;
— projection d’abrasifs;
— soudage; et
— évacuation.

Chaque APR aura une classification individuelle compte tenu de ses performances spécifiées dans les

normes de performance applicables.
Des explications et exemples de classifications des APR sont donnés en annexes.

Les définitions suivantes permettent de comprendre la manière dont les Normes internationales et les

autres documents normatifs ISO (Spécification technique, Spécification publiquement disponible ou

Accord international d’atelier) doivent être appliqués:
— le verbe «devoir» indique une exigence;
— l’expression «il convient de» indique une recommandation;

— en anglais, l’auxiliaire «may» («pouvoir» en français) est utilisé pour indiquer que quelque chose est

autorisé; et

— l’auxiliaire «can» (également « pouvoir » en français) est employé pour indiquer que quelque chose est

possible, par exemple, qu’une organisation ou qu’un individu est susceptible de faire quelque chose.

Le paragraphe 3.3.1 des Directives ISO/IEC, Partie 2 (sixième édition, 2011) définit une exigence comme

une «expression dans le contenu d’un document formulant les critères à respecter afin de prétendre à la

conformité avec le document, et avec lesquels aucun écart n’est permis».

Le paragraphe 3.3.2 des Directives ISO/IEC, Partie 2 (sixième édition, 2011) définit une recommandation

comme une «expression dans le contenu d’un document formulant qu’entre plusieurs possibilités, une

© ISO 2016 – Tous droits réservés v
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ISO/TS 16973:2016(F)

est particulièrement appropriée, sans pour autant mentionner ou exclure les autres, ou qu’une certaine

manière de faire est préférée sans être nécessairement exigée, ou encore (à la forme négative) qu’une

certaine possibilité ou manière de faire est déconseillée, mais non interdite».
vi © ISO 2016 – Tous droits réservés
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SPÉCIFICATION TECHNIQUE ISO/TS 16973:2016(F)
Appareils de protection respiratoire — Classification pour
les APR, à l’exclusion des APR pour application sous-marine
1  Domaine d’application

La présente Spécification technique définit la classification des appareils de protection respiratoire

compte tenu de leurs performances. Les exigences de performances sont données dans les normes de

performance applicables.
2  Références normatives

Les documents ci-après, dans leur intégralité ou non, sont des références normatives indispensables à

l’application du présent document. Pour les références datées, seule l’édition citée s’applique. Pour les

références non datées, la dernière édition du document de référence s’applique (y compris les éventuels

amendements).

ISO 16900-1, Appareils de protection respiratoire — Méthodes d’essai et équipement d’essai — Partie 1:

Détermination des fuites vers l’intérieur.

ISO 16900-3, Appareils de protection respiratoire — Méthodes d’essai et équipement d’essai — Partie 3:

Détermination de la pénétration d’un filtre à particules.

ISO 16900-12, Appareils de protection respiratoire — Méthodes d’essai et équipement d’essai — Partie 12:

Détermination du travail respiratoire en fonction du volume respiratoire et des pics de pressions

respiratoires.

ISO 16972, Appareils de protection respiratoire — Termes, définitions, symboles graphiques et unités

de mesure.

ISO/TS 16976-1, Appareils de protection respiratoire — Facteurs humains — Partie 1: Métabolismes

énergétiques et régimes des débits respiratoires.

ISO 17420-3, Appareils de protection respiratoire — Exigences de performances — Partie 3: Raccord

normalisé.
3  Termes et définitions

Pour les besoins du présent document, les termes et définitions donnés dans l’ISO 16972 s’appliquent.

4  Mode de fonctionnement

Les APR peuvent employer deux modes de fonctionnement pour alimenter le porteur en gaz respirable.

Ces modes sont décrits dans le Tableau 1.
© ISO 2016 – Tous droits réservés 1
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ISO/TS 16973:2016(F)
Tableau 1 — Mode de fonctionnement
Mode de fonctionne- Méthodes d’acheminement de gaz respirable
Exemples types d’APR
ment jusqu’au porteur
L’appareil de protection respiratoire (APR) alimente
Appareil respiratoire à adduc-
Alimentation en gaz le porteur en gaz respirable à partir d’une source
tion d’air comprimé, appareil
respirable d’alimentation distante ou grâce au gaz respirable
respiratoire autonome (ARA)
stocké ou régénéré par l’APR.
L’APR filtre les gaz, vapeurs et/ou particules conte-
Demi-masque avec filtre(s)
nus dans l’air ambiant en fonction de l’élément de
anti-gaz
Filtration
purification d’air (filtre) utilisé. Il peut s’agir d’appa-
Pièce faciale filtrante
reils assistés ou non assistés.

Les APR combinés sont des appareils pouvant fonctionner à la fois en mode filtrant et en mode

d’alimentation en gaz respirable. Les APR combinés peuvent être associés à différentes classes en

fonction du mode de fonctionnement utilisé. Par exemple: un APR muni d’un filtre auxiliaire et qui est

également capable de fonctionner comme un appareil respiratoire à adduction d’air comprimé.

Les APR multi-fonctionnels sont des APR présentant différentes méthodes de fonctionnement en mode

filtrant ou en mode d’alimentation en gaz respirable.

Les APR multi-fonctionnels peuvent être associés à différentes classes en fonction du mode de

fonctionnement utilisé.

Par exemple: un APR capable de fonctionner comme un appareil respiratoire à adduction d’air

comprimé avec un appareil respiratoire autonome auxiliaire. Ou encore: un APR filtrant assisté capable

de fonctionner comme un APR filtrant sans assistance (sans alimentation électrique).

Les exigences de performance des APR à alimentation en gaz respirable et des APR filtrants sont

spécifiées dans les normes de performance applicables.
5 Classes de protection (PC)
L’APR doit être catégorisé par sa classe de protection.

Les classes de protection sont dérivées des résultats d’un essai de fuite totale vers l’intérieur en

laboratoire, conformément à l’ISO 16900-1 et aux normes de performance applicables. Ces classes sont

décrites dans le Tableau 2.
Tableau 2 — Classes de protection
TILMAX
Classe de protection
PC1 20
PC2 5
PC3 1
PC4 0,1
PC5 0,01
PC6 0,001

NOTE La fuite totale vers l’intérieur (ou TIL) représente le ratio de concentration d’un agent d’essai dans la

zone respiratoire par rapport à la concentration à l’extérieur de l’APR, exprimé en pourcentage. Il s’agit du niveau

de fuite totale vers l’intérieur de l’APR mesuré en laboratoire dans des conditions normales définies. Les niveaux

TIL utilisés dans l’évaluation des APR sont donnés au Tableau 2 et dans la Figure A.1.

2 © ISO 2016 – Tous droits réservés
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ISO/TS 16973:2016(F)
Tableau 2 (suite)
6  Rythme de travail

L’APR doit être classé par sa classe de rythme de travail, classe déterminée par le fabricant de l’APR.

Les classes de rythme de travail sont dérivées des résultats d’un essai en laboratoire sur le travail

respiratoire et des exigences de performances associées, conformément à l’ISO 16900-12 et aux normes

de performance applicables.
Ces classes sont:
— W4, qui équivaut à la classe de travail 8 (maximal) de l’ISO/TS 16976-1;

— W3, qui englobe les classes de travail 7 et 6 (extrêmement lourd et très très lourd) de l’ISO/TS 16976-1;

— W2 qui englobe les classes de travail 5 et 4 (très lourd et lourd) de l’ISO/TS 16976-1; et

— W1, qui englobe les classes de travail 3, 2 et 1 (modéré et léger) de l’ISO/TS 16976-1.

Pour toute information complémentaire, voir l’Annexe D. Les APR désignés pour des applications

particulières peuvent avoir des exigences de performances associées à des classes de rythme de travail

minimales.
7 Classe d’interface respiratoire

Les interfaces respiratoires doivent être classées par zone de couverture [voir Figure E.1, a) à e)].

Les interfaces respiratoires doivent être de plus classées par type: ajustement serré (qui confèrent

une étanchéité à la peau du porteur) et ajustement lâche (qui forment une jonction partielle ou qui ne

forment aucune jonction avec la peau du porteur). Voir Tableau 3, Figure A.1 et Figure E.1.

Tableau 3 — Classes d’interface respiratoire
Classe d’interface res-
Zone d’interface respiratoire Type
piratoire
eL e - plus que la tête, jusqu’à l’ensemble du corps L-Ajustement lâche
eT e - plus que la tête, jusqu’à l’ensemble du corps T-Ajustement serré
dL d - Tête L-Ajustement lâche
dT d - Tête T-Ajustement serré
cL c -Visage L-Ajustement lâche
cT c -Visage T-Ajustement serré
bL b - Nez et bouche L-Ajustement lâche
bT b - Nez et bouche T-Ajustement serré
aL a - Bouche uniquement L-Ajustement lâche
aT a - Bouche uniquement T-Ajustement serré
8  Classe de capacité des APR alimentés en gaz respirable

Les APR alimentés en gaz respirable disposant d’un volume fixe de gaz respirable (autonomes) doivent

être classés en fonction du volume de gaz respirable disponible. Ils doivent être désignés par la lettre

«S» suivie de la capacité en gaz, exprimée en litres et arrondie par incréments de 150 litres jusqu’à

900 litres et par incréments de 300 litres au-delà de 900 litres.

Les APR alimentés en gaz respirable disposant d’une source externe de gaz respirable doivent être

classés et marqués «SY».

La classification de capacité en gaz de ces appareils est indiquée au Tableau 4 et à la Figure A.2.

© ISO 2016 – Tous droits réservés 3
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ISO/TS 16973:2016(F)
Tableau 4 — Capacité en gaz respirable fourni
Capacité en gaz
Classe
en litres
Sxxxx Où xxxx représente le volume de gaz respirable disponible
SY Alimentation en air provenant d’une source externe (à adduction d’air)
9  Classe de filtre
9.1  Classe de filtre à particules

Les filtres à particules doivent être classés par efficacité et par rythme de travail.

9.1.1  Efficacité du filtre à particules

On distingue cinq classes d’efficacité du filtre à particules, allant d’une très faible efficacité à une

efficacité extrêmement élevée. Le Tableau 5 et la Figure A.3 répertorient les classes de filtre et

l’efficacité minimale du filtre, telles que définies au cours des essais d’efficacité des filtres en laboratoire,

conformément à l’ISO 16900-3, au débit applicable compte tenu de la classe de rythme de travail.

Tableau 5 — Classe de filtre à particules
Efficacité du filtre à particules
Classe
F1 ≥ 80,00
F2 ≥ 95,00
F3 ≥ 99,00
F4 ≥ 99,90
F5 ≥ 99,99
9.1.2  Classe de rythme de travail des filtres à particules

Les filtres à particules doivent être, en outre, classés par rythme de travail et sont également marqués

par un «w» en lettre minuscule suivi du numéro de la classe de rythme de travail, à savoir «w1», «w2»,

«w3» ou «w4» à la suite de la classe d’efficacité et/ou de capacité.
9.2  Classe de filtre anti-gaz
9.2.1 Généralités

Les filtres anti-gaz doivent être classés par type (nature du gaz), par classe (en fonction de la capacité

en gaz) et par rythme de travail.
Un filtre anti-gaz peut être d’un ou plusieurs types.
9.2.2  Capacité des filtres anti-gaz

Un filtre anti-gaz est classé par sa capacité à éliminer les contaminants et est testé à différentes

concentrations en fonction de sa classe (1, 2, 3 et 4) et à différents débits en fonction de son rythme de

travail. Certains filtres couvrent de nombreux contaminants d’une même catégorie, par exemple les

vapeurs organiques, et d’autres des gaz ou vapeurs spécifiques tels que l’arsine. En fonction du type de

filtre, jusqu’à quatre classes de capacité sont définies (voir Tableau 6, Tableau 7 et Figure A.3).

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ISO/TS 16973:2016(F)
Tableau 6 — Types et classes de filtres anti-gaz
Type Classes Description du type Contaminants types
C H (toluène)
7 8
OV 1, 2, 3 ou 4 Vapeur organique
C H (cyclohexane)
6 12
Gaz organique C H O (acétone)
3 6
OG 1 (faible point d’ébullition, C H (isobutane)
4 10
c’est-à-dire inférieur à 65 °C) C H O (éther diméthylique)
2 6
Cl (chlore)
H S (sulfure d’hydrogène)
AC 1, 2, 3 ou 4 Composés acides
HCl (chlorure d’hydrogène)
SO (dioxyde de soufre)
NH , (ammoniac)
BC 1, 2, 3 ou 4 Composés basiques
CH NH (méthylamine)
3 2
NOX 1, 2 ou 3 Oxydes d’azote NO (oxydes d’azote)
Tableau 7 — Types et classes spécifiques de filtres anti-gaz
Type Classes Gaz ou vapeur
ND 1, 2 ou 3 Dioxyde d’azote (NO )
HG 1, 2 ou 3 Mercure (Hg)
OZ 1 Ozone (O )
HCN 1, 2, 3 ou 4 Acide cyanhydrique (HCN)
AH 1 Arsine (AsH )
HF 1, 2 ou 3 Fluorure d’hydrogène (HF)
CD 1 Dioxyde de chlore (ClO )
ETO 1 ou 2 Oxyde d’éthylène ((CH ) O)
2 2
FM 1, 2 ou 3 Formaldéhyde (CH O)
MB 1, 2 ou 3 Bromure de méthyle (CH Br)
Trois classes en fonction du temps (20 min,
CO Monoxyde de carbone (CO)
60 min ou 180 min)
PH 1 ou 2 Phosphine (PH )
9.2.3  Classe de rythme de travail des filtres anti-gaz

Les filtres anti-gaz doivent être, en outre, classés par rythme de travail et sont également marqués par

un «w» en lettre minuscule suivi du numéro de la classe de rythme de travail, à savoir «w1», «w2»,

«w3» ou «w4» à la suite de la classe d’efficacité et/ou de capacité.
10 APR utilisant un raccordement normalisé

Pour faciliter l’interchangeabilité, certains APR comprennent des interfaces respiratoires et des filtres

avec des raccordements normalisés conformément à l’ISO 17420-3. Les classes sont soumises aux

restrictions spécifiées dans la norme de performance adéquate.

Une interface respiratoire et un filtre avec raccordement normalisé sont marqués par leur

classification, également spécifiée dans la norme de performance adéquate. Le symbole correspondant

au raccordement normalisé, ⊚, est ajouté au marquage. Les filtres à raccordements normalisés sont

validés pour la classe de rythme de travail w1 ou w2.
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ISO/TS 16973:2016(F)
11 Classe des applications particulières
11.1 Généralités

Les applications particulières spécifient différentes zones d’utilisation des APR associées à des

exigences de performances distinctes. Les classe de protection (PC) et classe de rythme de travail (W)

minimales sont établies conformément aux normes de performance adéquates, et sont spécifiées aux

paragraphes 11.2 à 11.8. Ces classes doivent être satisfaites pour obtenir la classification correspondant

à l’application particulière. Les classes PC et W supérieures ne sont pas exclues.

Les applications particulières incluent:
— lutte contre l’incendie;
— CBRN;
— applications maritimes;
— applications minières;
— projection d’abrasifs;
— soudage; et
— évacuation.

Les appareils pour applications particulières sont référencés par leur désignation alphanumérique.

Les APR destinés aux applications particulières devront satisfaire aux exigences de performances

supplémentaires (par exemple, résistance supplémentaire à la chaleur et aux flammes pour les APR

destinés à la lutte contre l’incendie).
11.2 Classe de lutte contre l’incendie

Les APR de lutte contre l’incendie sont désignés par les classifications d’APR respectives suivies des

lettres FF et de la désignation numérique correspondant à une application de lutte contre l’incendie

spécifique, à savoir: lutte contre les feux de forêt, sauvetage, matières dangereuses et lutte contre les

feux de bâtiment. Voir Tableau 8 et Figure A.4.
Tableau 8 — Classes de lutte contre l’incendie
Classe de protection Classe de rythme de
Classe Application
minimale travail minimale
FF5 Lutte contre les feux de bâtiment type R2 PC5 W4
FF4 Lutte contre les feux de bâtiment type R1 PC5 W3
FF3 Matières dangereuses PC5 W3
FF2 Sauvetage PC4 W3
FF1 Lutte contre les feux de forêt PC3 W2

Le type R2 inclut un niveau d’exposition thermique supérieur à celui du type R1 conformément à l’ISO 11999-1.

11.3 Classe des risques chimiques, biologiques, radiologiques et nucléaires (CBRN)

Les APR destinés aux applications CBRN sont désignés par les classifications d’APR respectives suivies

des lettres CBRN et de la désignation numérique correspondant à l’application CBRN spécifique. Voir

Tableau 9 et Figure A.4.
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ISO/TS 16973:2016(F)

Tableau 9 — Classes des applications chimiques, biologiques, radiologiques et nucléaires (CBRN)

Classe de protection Classe de rythme de
Classe Application
minimale travail minimale
CBRN 3 1er intervenant sur les lieux PC5 W3
Intervenant
CBRN 2 PC5 W1
(contexte de menace connu)
CBRN 1 Destinataire/1er destinataire PC4 W1
11.4 Classe maritime

Les APR destinés aux applications maritimes sont désignés par les classifications d’APR respectives

suivies des lettres MA et de la désignation numérique correspondant à une application maritime

spécifique, à savoir: lutte contre l’incendie et matières dangereuses. Voir Tableau 10 et Figure A.4.

Tableau 10 — Classes maritimes
Classe de protection Classe de rythme de
Classe Application
minimale travail minimale
MA2 Lutte contre les incendies maritimes W4
PC5
MA1 Matières dangereuses W3
11.5 Classe d’applications minières

Les APR destinés aux applications minières sont désignés par les classifications d’APR respectives

suivies des lettres MN et de la désignation numérique correspondant à une application minière

spécifique, à savoir: atmosphère souterraine non explosive, atmosphère souterraine explosive et lutte

contre l’incendie. Voir Tableau 11 et Figure A.4.
Tableau 11 — Classes d’applications minières
Classe de protection Classe de rythme de
Classe Application
minimale travail minimale
Lutte contre les incendies miniers et sauve-
MN4 PC5 W4
tage type R2
Lutte contre les incendies miniers et sauve-
MN3 PC4 W2
tage type R1
Atmosphères explosiv
...

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