ISO/PRF TS 17420-8

Respiratory protective devices -- Performance requirements

Dispositifs de protection respiratoire -- Exigences de performance

General Information

• Status: Published
• ICS: 13.340.30 - Respiratory protective devices
• Technical Committee: ISO/TC 94/SC 15 - Respiratory protective devices
• Drafting Committee: ISO/TC 94/SC 15/WG 7 - CBRN

Standards Content (sample)

TECHNICAL ISO/TS
SPECIFICATION 17420-8
First edition
Respiratory protective devices —
Performance requirements —
Part 8:
Special application chemical,
biological, radiological and nuclear
(CBRN) filtering and radiological-
nuclear (RN) filtering RPD
Dispositifs de protection respiratoire — Exigences de performance —
Partie 8: APR d'application spéciale de filtrage chimique, biologique,
radiologique et nucléaire (NRBC) et de filtrage radiologique-nucléaire
(RN)
PROOF/ÉPREUVE
Reference number
ISO/TS 17420-8:2021(E)
ISO 2021
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ISO/TS 17420-8:2021(E)
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Published in Switzerland
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ISO/TS 17420-8:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................vi

Introduction ..............................................................................................................................................................................................................................vii

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

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

3 Terms, definitions and abbreviations ............................................................................................................................................ 2

3.1 Terms and definitions ....................................................................................................................................................................... 3

3.2 Abbreviated terms ............................................................................................................................................................................... 4

4 Designation and classification ............................................................................................................................................................... 5

4.1 General ........................................................................................................................................................................................................... 5

4.2 Special application CBRN1............................................................................................................................................................ 5

4.3 Special application CBRN2............................................................................................................................................................ 5

4.4 Special application Escape CBRN ............................................................................................................................................ 5

4.5 CBRN RPD summary of capabilities ..................................................................................................................................... 5

4.6 CBRN filtering RPD classes ........................................................................................................................................................... 6

4.6.1 General...................................................................................................................................................................................... 6

4.6.2 CBRN filtering RPD ........................................................................................................................................................ 6

4.6.3 Escape CBRN filtering RPD ..................................................................................................................................... 6

5 RN filters - Designation and classification ................................................................................................................................. 7

5.1 General ........................................................................................................................................................................................................... 7

5.2 RN filters ....................................................................................................................................................................................................... 7

5.3 RN filter classification ....................................................................................................................................................................... 7

6 Requirements .......................................................................................................................................................................................................... 7

6.1 General ........................................................................................................................................................................................................... 7

6.2 Test samples .............................................................................................................................................................................................. 8

6.3 CBRN filtering RPD .............................................................................................................................................................................. 8

6.3.1 CBRN filtering RPD operation .............................................................................................................................. 8

6.3.2 CBRN filtering RPD ........................................................................................................................................................ 8

6.3.3 Escape CBRN filtering RPD ..................................................................................................................................10

6.4 RN filters ....................................................................................................................................................................................................11

7 Pre-conditioning ................................................................................................................................................................................................12

7.1 General ........................................................................................................................................................................................................12

7.2 Components excluded from pre-conditioning – Exposure to vibration .............................................12

7.3 CBRN filtering RPD-specific pre-conditioning ..........................................................................................................13

7.3.1 Temperature and humidity pre-conditioning ......................................................................................13

7.3.2 Humidity pre-conditioning of filters for radioactive iodomethane test ........................13

8 CBRN filtering RPD ..........................................................................................................................................................................................14

8.1 Requirements for complete CBRN filtering RPD ....................................................................................................14

8.1.1 General...................................................................................................................................................................................14

8.1.2 Airflow ...................................................................................................................................................................................15

8.1.3 Protection class ..............................................................................................................................................................15

8.1.4 Temperature of operation .....................................................................................................................................16

8.2 Chemical resistance .........................................................................................................................................................................16

8.2.1 General...................................................................................................................................................................................16

8.2.2 CBRN1 and CBRN2 chemical resistance requirements ...............................................................16

8.2.3 Pass/fail criteria ............................................................................................................................................................17

8.3 Requirements for filters and components of CBRN filtering RPD ...........................................................17

8.3.1 Respiratory Interfaces (RIs) ................................................................................................................................17

8.3.2 Connectors .........................................................................................................................................................................18

8.3.3 Filters ......................................................................................................................................................................................18

8.4 CBRN filtering RPD with standardized connector .................................................................................................23

8.4.1 General...................................................................................................................................................................................23

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ISO/TS 17420-8:2021(E)

8.4.2 Components of CBRN filtering RPD with standardized connector ...................................23

8.4.3 Assisted CBRN filtering RPD with a standardized connector with a tight-

fitting RI ................................................................................................................................................................................25

8.4.4 Assisted CBRN filtering RPD with standardized connector with a loose-

fitting RI ................................................................................................................................................................................26

9 Escape CBRN filtering RPD ......................................................................................................................................................................26

9.1 General ........................................................................................................................................................................................................26

9.2 Requirements ........................................................................................................................................................................................27

9.2.1 Specification of duration, t, of escape CBRN filtering RPD .......................................................27

9.2.2 Validation of Escape CBRN filtering RPD performance ...............................................................27

9.2.3 Protection class ..............................................................................................................................................................27

9.2.4 CBRN chemical resistance ....................................................................................................................................28

9.2.5 Practical performance testing ...........................................................................................................................29

9.3 Requirements for filters and components of Escape CBRN filtering RPD ........................................29

9.3.1 RI .................. ......................................................................................................................... ......................................................29

9.3.2 Connectors .........................................................................................................................................................................29

9.3.3 Filter ........................................................................................................................................................................................29

10 RN Filters — Requirements and testing ....................................................................................................................................31

10.1 General ........................................................................................................................................................................................................31

10.2 Particle filter efficiency .................................................................................................................................................................32

10.3 Gas filtration performance .........................................................................................................................................................32

10.3.1 Radioactive iodomethane retention requirements .........................................................................32

10.3.2 Organic vapour capacity requirements .....................................................................................................32

10.4 RN Filters with standardized connector ........................................................................................................................32

10.4.1 Work rate of filters with a standardized connector ........................................................................32

10.4.2 Mass and size of filters with a standardized connector ..............................................................32

10.4.3 Airflow resistance of RN filters with standardized connector ..............................................32

11 Multi-functional RPD .....................................................................................................................................................................................32

11.1 General ........................................................................................................................................................................................................32

11.2 CBRN1 and CBRN2 RPD ...............................................................................................................................................................33

11.3 ES CBRN filtering RPD ...................................................................................................................................................................33

12 Optional features ..............................................................................................................................................................................................33

12.1 General ........................................................................................................................................................................................................33

12.2 Hydration ..................................................................................................................................................................................................33

12.3 End of service life indicator for filters (ESLI) ............................................................................................................33

13 Training components ....................................................................................................................................................................................33

14 Reliability ..................................................................................................................................................................................................................34

15 Inspection and practical performance testing ...................................................................................................................34

16 Test methods ..........................................................................................................................................................................................................34

16.1 General ........................................................................................................................................................................................................34

16.2 Toxic agent penetration and permeation tests .........................................................................................................34

16.2.1 General...................................................................................................................................................................................34

16.2.2 Materials and test methods .................................................................................................................................35

16.2.3 Liquid and vapour permeation test ..............................................................................................................35

16.2.4 Test report ..........................................................................................................................................................................37

16.3 Radioactive Iodomethane gas test ......................................................................................................................................37

16.3.1 Test apparatus .................................................................................................................................................................37

16.3.2 Test agent ............................................................................................................................................................................38

16.3.3 Filter testing ......................................................................................................................................................................38

16.3.4 Test procedure ................................................................................................................................................................38

16.3.5 Radioactivity retention determination ......................................................................................................39

16.3.6 Test report ..........................................................................................................................................................................40

17 Marking .......................................................................................................................................................................................................................40

17.1 General ........................................................................................................................................................................................................40

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ISO/TS 17420-8:2021(E)

17.2 Marking of CBRN filtering RPD and components ...................................................................................................40

17.3 Escape CBRN filtering RPD marking .................................................................................................................................41

17.4 RN filter marking................................................................................................................................................................................42

17.5 Standardized connector ...............................................................................................................................................................42

18 Information supplied by the manufacturer ..........................................................................................................................42

18.1 General ........................................................................................................................................................................................................42

18.2 CBRN filtering or RN filtering RPD information ......................................................................................................42

Annex A (informative) Number of samples and test schedules .............................................................................................43

Annex B (informative) CBRN RPD configurations ................................................................................................................................44

Annex C (informative) Application of uncertainty of measurement ................................................................................51

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ISO/TS 17420-8:2021(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 of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 94, Personal safety — Personal protective

equipment, Subcommittee SC 15, Respiratory protective devices.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
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ISO/TS 17420-8:2021(E)
Introduction

The personal protection requirements of personnel who respond to emergencies are recognised as

being different from those of the regular workforce. With respect to response to incidents involving

release of chemical, biological or radiological materials, or after nuclear events (CBRN events), specific

requirements have to be established. The hazardous exposures occurring in such incidents can result

in severe consequences for an improperly protected responder.
Specifically, for the types of protection required:
a) Protection levels need to be high for those in the vicinity of an incident.

b) Materials used in construction of the equipment shall withstand permeation by highly aggressive

chemicals.

c) The range of chemical protection offered by filtering systems needs to be very broad, as the

opportunity for assessment of the nature of the hazard ahead of the time of use of the equipment

may be limited.

d) The efficiency of particle filtration needs to be high to protect the equipment wearer against

ingress of radioactive particulate matter or biological agents.

These requirements in the ISO system are summarized in this document covering the special application

CBRN. This document is an adjunct to other parts of ISO 17420 and should be read together with them.

This document provides classification of equipment, performance requirements and specific test

methods for respiratory protective devices (RPD) for use in CBRN response. Selection requirements are

addressed in separate documents.

NOTE The performance requirements included in this document refer to laboratory testing using specified

test agents under specified conditions which might not indicate the performance of the device in actual usage.

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TECHNICAL SPECIFICATION ISO/TS 17420-8:2021(E)
Respiratory protective devices — Performance
requirements —
Part 8:
Special application chemical, biological, radiological and
nuclear (CBRN) filtering and radiological-nuclear (RN)
filtering RPD
1 Scope

This document specifies the requirements for respiratory protective devices for use by workers during

response to incidents involving chemical, biological radiological or nuclear (CBRN) materials used with

intent to cause harm or in cases of accidental release outside traditional hazardous materials response

categories. For the purposes of this document, all incidents described here are named CBRN incidents.

This document is applicable to RPD for use by personnel in the following roles:

— First responders: including police, fire service, emergency medical, search and rescue, sampling and

detection teams.

— Workers needed for specific roles during response (utility, transportation, service continuity).

— Medical personnel working with casualties of CBRN incidents.
— Responders to release incidents involving nuclear materials.
— Non-emergency but CBRN-related roles.

— Workers in need of protection during escape from a CBRN or radiological release incident.

— Workers in need of protection from nuclear materials.

The requirements for RPD use by the following groups are not addressed by this document:

— Military personnel outside of first responder roles.
— Children.
— Animals.
Requirements for the following are not covered by this document:
— Collective protection systems including ventilated casualty/body bags.
— Methods of and criteria for decontamination of RPD.
— Disposal of used equipment.

This document is focused on respiratory protection requirements, but it is recognised that CBRN RPD

are always used as part of an ensemble with protective clothing. The total ensemble effectiveness is not

covered by this document.
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ISO/TS 17420-8:2021(E)
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

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

of inward leakage

ISO 16900-2, Respiratory protective devices — Methods of test and test equipment — Part 2: Determination

of breathing resistance

ISO 16900-4, Respiratory protective devices — Methods of test and test equipment — Part 4: Determination

of gas filter capacity and migration, desorption and carbon monoxide dynamic testing

ISO 16900-5, Respiratory protective devices — Methods of test and test equipment — Part 5: Breathing

machine, metabolic simulator, RPD headforms and torso, tools and verification tools

ISO 16900-8:2015, Respiratory protective devices — Methods of test and test equipment — Part 8:

Measurement of RPD air flow rates of assist
...