ISO 7203-3:2019
(Main)Fire extinguishing media — Foam concentrates — Part 3: Specification for low-expansion foam concentrates for top application to water-miscible liquids
Fire extinguishing media — Foam concentrates — Part 3: Specification for low-expansion foam concentrates for top application to water-miscible liquids
This document specifies the essential properties and performance of liquid foam concentrates used to make low-expansion foams for the control, extinction and inhibition of re-ignition of fires of water-miscible liquids. Minimum performance on certain test fires is specified. These foams are suitable for top application to fires of water-miscible liquids. Those foams that also comply with ISO 7203-1 are also suitable for top application to fires of water-immiscible liquids. The foam concentrates can be suitable for use in non-aspirating sprayers or for subsurface application to liquid fires, but requirements specific to those applications are not included in this document.
Agents extincteurs — Émulseurs — Partie 3: Spécifications pour les émulseurs bas foisonnement destinés à une application par le haut sur les liquides miscibles à l'eau
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INTERNATIONAL ISO
STANDARD 7203-3
Third edition
2019-07
Fire extinguishing media — Foam
concentrates —
Part 3:
Specification for low-expansion foam
concentrates for top application to
water-miscible liquids
Agents extincteurs — Émulseurs —
Partie 3: Spécifications pour les émulseurs bas foisonnement destinés
à une application par le haut sur les liquides miscibles à l'eau
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Grades and uses of foam concentrates . 4
4.1 Grades . 4
4.2 Use with sea water . 4
5 Tolerance of the foam concentrate to freezing and thawing . 4
6 Sediment in the foam concentrate . 4
6.1 Sediment before ageing . 4
6.2 Sediment after ageing . 4
7 Determination of viscosity . 4
7.1 Newtonian foam concentrates . 4
7.2 Pseudo-plastic foam concentrates . 4
8 pH of the foam concentrate . 5
8.1 pH limits. 5
8.2 Sensitivity to temperature . 5
9 Expansion and drainage of foam. 5
9.1 General . 5
9.2 Expansion limits . 5
9.3 Drainage limits . 5
10 Test fire performance . 5
11 Marking, packaging and specification sheet . 6
11.1 Marking . 6
11.2 Packaging . 7
11.3 Specification sheet . 7
Annex A (normative) Preliminary sampling and conditioning of the foam concentrate .8
Annex B (normative) Determination of tolerance to freezing and thawing .9
Annex C (normative) Determination of percentage of sediment .11
Annex D (normative) Determination of viscosity for pseudo-plastic foam concentrates .12
Annex E (normative) Determination of expansion and drainage time .14
Annex F (normative) Determination of test fire performance .20
Annex G (informative) Determination of radiation measurement method .24
Annex H (informative) Compatibility .28
Annex I (informative) Small-scale fire test .29
Bibliography .39
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 21, Equipment for fire protection and fire
fighting, Subcommittee SC 6, Foam and powder media and firefighting systems using foam and powder.
This third edition cancels and replaces the second edition (ISO 7203-3:2011), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Clause 2 “Terms and definitions” has been extended;
— Clause 9 “Expansion and drainage of foam” has been modified to run two tests instead of one and
take the average of both values instead having just one datum;
— Several Figures were corrected;
— Annex F “Determination of test fire performance” has been extended by a scheme of a decision tree
and the acceptable temperature range for testing fire performance has been modified;
— Annex “Typical anticipated performance for various types of foam concentrate” has been removed
from the document.
A list of all parts in the ISO 7203 series can be found on the ISO website.
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.
iv © ISO 2019 – All rights reserved
Introduction
Firefighting foams are widely used to control and extinguish fires of Class B (flammable liquids) and /
or Class A fuels (Solid materials, usually of an organic nature) and for inhibiting re-ignition.
Foams can be used in combination with other extinguishing media, particularly halons, carbon dioxide
and powders, which are the subject of other International Standards, including, ISO 6183, ISO 7201-1,
ISO 7201-2 and ISO 7202. A specification for foam systems can be found in ISO 7076.
Attention is drawn to Annex H, which deals with the compatibility of foam concentrates, and the
compatibility of foams and powders.
INTERNATIONAL STANDARD ISO 7203-3:2019(E)
Fire extinguishing media — Foam concentrates —
Part 3:
Specification for low-expansion foam concentrates for top
application to water-miscible liquids
1 Scope
This document specifies the essential properties and performance of liquid foam concentrates used
to make low-expansion foams for the control, extinction and inhibition of re-ignition of fires of water-
miscible liquids. Minimum performance on certain test fires is specified.
These foams are suitable for top application to fires of water-miscible liquids. Those foams that also
comply with ISO 7203-1 are also suitable for top application to fires of water-immiscible liquids.
The foam concentrates can be suitable for use in non-aspirating sprayers or for subsurface application
to liquid fires, but requirements specific to those applications are not included in this document.
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 3104, Petroleum products — Transparent and opaque liquids — Determination of kinematic viscosity
and calculation of dynamic viscosity
ISO 3219, Plastics — Polymers/resins in the liquid state or as emulsions or dispersions — Determination of
viscosity using a rotational viscometer with defined shear rate
ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 3506-1, Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts, screws
and studs
ISO 7203-2, Fire extinguishing media — Foam concentrates — Part 2: Specification for medium - and high -
expansion foam concentrates for top application to water-immiscible liquids
BS 5117-1.3:1985, Testing corrosion inhibiting, engine coolant concentrate (“antifreeze”). Methods of test
for determination of physical and chemical properties. Determination of freezing point
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
characteristic value
value declared by
...
ISO /PRF 7203-3:2019(E)
ISO TC 21/SC 6
Secretariat: SAC
Fire extinguishing media — Foam concentrates — Part 3: Specification for low-expansion foam
concentrates for top application to water-miscible liquids
Agents extincteurs — Émulseurs —
Partie 3: Spécifications pour les émulseurs bas foisonnement destinés à une application par le haut
sur les liquides miscibles à l'eau
DIS stage
Warning for WDs and CDs
This document is not an ISO International Standard. It is distributed for review and comment. It
is subject to change without notice and may not be referred to as an International Standard.
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.
To help you, this guide on writing standards was produced by the ISO/TMB and is available at
https://www.iso.org/iso/how-to-write-standards.pdf
A model manuscript of a draft International Standard (known as “The Rice Model”) is available at
https://www.iso.org/iso/model_document-rice_model.pdf
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 2019 – All rights reserved
Contents
Foreword . 6
Introduction. 7
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Grades and uses of foam concentrates . 4
4.1 Grades . 4
4.2 Use with sea water . 4
5 Tolerance of the foam concentrate to freezing and thawing . 4
6 Sediment in the foam concentrate . 4
6.1 Sediment before ageing . 4
6.2 Sediment after ageing . 4
7 Determination of viscosity . 4
7.1 Newtonian foam concentrates . 4
7.2 Pseudo-plastic foam concentrates . 4
8 pH of the foam concentrate . 5
8.1 pH limits . 5
8.2 Sensitivity to temperature . 5
9 Expansion and drainage of foam . 5
9.1 General . 5
9.2 Expansion limits . 5
9.3 Drainage limits . 5
10 Test fire performance . 5
Table 1 — Extinguishing performance classes and burn-back resistance levels . 5
11 Marking, packaging and specification sheet . 6
11.1 Marking . 6
11.2 Packaging . 7
11.3 Specification sheet . 7
Annex A (normative) Preliminary sampling and conditioning of the foam concentrate . 8
A.1 Preliminary sampling . 8
A.2 Conditioning of foam concentrate . 8
A.3 Subsequent testing . 8
Annex B (normative) Determination of tolerance to freezing and thawing . 9
B.1 Apparatus . 9
B.2 Procedure . 9
Figure B.1 — Typical form of polyethylene tube . 10
Annex C (normative) Determination of percentage of sediment . 11
C.1 Sampling . 11
C.2 Apparatus . 11
C.3 Procedure . 11
Annex D (normative) Determination of viscosity for pseudo-plastic foam concentrates . 12
D.1 General . 12
D.2 Viscosity determination . 12
D.2.1 Apparatus . 12
D.2.2 Test temperatures . 12
D.2.3 Viscosity measurement . 12
D.2.4 Results . 13
Annex E (normative) Determination of expansion and drainage time . 14
E.1 Apparatus . 14
E.2 Temperature conditions . 14
E.3 Procedure . 14
E.4 Synthetic sea water . 15
Table E.1 — Components of synthetic sea water . 15
Figure E.1 — Collecting vessel for determination of expansion and drainage time . 16
Figure E.2 — Foam collector for expansion and drainage measurement . 16
Figure E.3 — Foam-making nozzle (concluded) . 18
Annex F (normative) Determination of test fire performance. 19
F.1 General . 19
F.2 General conditions . 19
F.2.1 Test series and criteria for success . 19
F.2.1.1 Foam concentrates not compatible with sea water . 19
F.2.1.2 Foam concentrates compatible with sea water . 19
F.2.1.3 Decision tree fire test protocol . 19
Figure F.1 — Decision tree for fire performance test on polar fuels . 20
F.2.2 Temperature and wind speed . 20
F.2.3 Records . 20
F.2.4 Foam solution . 21
F.2.5 Fuel . 21
F.3 Fire test . 21
F.3.1 Apparatus . 21
F.3.2 Test procedure . 21
Figure F.2 — Test fire arrangement . 22
Annex G (informative) Determination of radiation measurement method . 23
G.1 Evaluation . 23
G.2 General arrangement of test . 23
Figure G.1 — Location of radiometers for recording heat radiation during fire performance
tests . 23
G.3 Technical data for radiometers . 23
G.4 Procedure . 24
iv © ISO 2019 – All rights reserved
Figure G.2 — Typical absolute radiation levels throughout a test. 25
Figure G.3 — Typical relative radiation levels during extinction . 25
Figure G.4 — Typical relative radiation levels during burn-back. 26
Annex H (informative) Compatibility . 27
H.1 Compatibility between f
...
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