Reaction to fire tests — Ignitability of products subjected to direct impingement of flame — Part 2: Single-flame source test

This document specifies a method of test for determining the ignitability of products by direct small flame impingement under zero impressed irradiance using vertically oriented test specimens. Information on the precision of the test method is given in Annex A (informative). Information on testing not essentially flat end-use products is given in Annex B (normative). Information on testing perforated end-use products is given in Annex C (normative).

Essais de réaction au feu — Allumabilité de produits soumis à l’incidence directe de la flamme — Partie 2: Essai à l’aide d’une source à flamme unique

Le présent document spécifie une méthode d'essai permettant de déterminer l'allumabilité des produits par incidence directe d'une petite flamme sous éclairement énergétique nul en utilisant des éprouvettes en position verticale. L'Annexe A (informative) fournit des informations sur la fidélité de la méthode d'essai. L'Annexe B (normative) fournit des informations concernant les essais sur produits non globalement plans dans leur utilisation finale. L'Annexe C (normative) fournit des informations concernant les essais sur des produits perforés dans leur utilisation finale.

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Not Published
Current Stage
5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
Start Date
11-Aug-2025
Completion Date
11-Aug-2025
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ISO/FDIS 11925-2 - Essais de réaction au feu — Allumabilité de produits soumis à l’incidence directe de la flamme — Partie 2: Essai à l’aide d’une source à flamme unique Released:27. 08. 2025
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Standards Content (Sample)


FINAL DRAFT
International
Standard
ISO/TC 92/SC 1
Reaction to fire tests — Ignitability
Secretariat: BSI
of products subjected to direct
Voting begins on:
impingement of flame —
2025-08-11
Part 2:
Voting terminates on:
2025-10-06
Single-flame source test
Essais de réaction au feu — Allumabilité de produits soumis à
l'incidence directe de la flamme —
Partie 2: Essai à l'aide d'une source à flamme unique
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 SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 92/SC 1
Reaction to fire tests — Ignitability
Secretariat: BSI
of products subjected to direct
Voting begins on:
impingement of flame —
Part 2:
Voting terminates on:
Single-flame source test
Essais de réaction au feu — Allumabilité de produits soumis à
l'incidence directe de la flamme —
Partie 2: Essai à l'aide d'une source à flamme unique
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 SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test apparatus . 2
5 Test specimen . 4
5.1 Preparation .4
5.2 Dimensions .4
5.3 Products which are not essentially flat .4
5.4 Number of specimens .4
5.5 Substrates .5
6 Conditioning . 5
7 Test procedure . 5
7.1 General .5
7.2 Two flame application times are available, 15 s or 30 s, as required by the sponsor. The
start time of the test is on application of the flame.Preliminary operations .5
7.3 Testing operations .5
7.4 Duration of test .7
8 Expression of results . 7
9 Test report . 8
Annex A (informative) Precision of test method .22
Annex B (normative) Testing not essentially flat end-use products .25
Annex C (normative) Testing perforated end-use products .26
Bibliography .27

iii
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 92, Fire safety, Subcommittee SC 1, Fire
initiation and growth, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 127, Fire safety in buildigns, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This fifth edition cancels and replaces the fourth edition (ISO 11925-2:2020), which has been technically
revised.
The main changes are as follows:
— note on the evaluation of the flame tip;
— revision of all figures.
A list of all parts in the ISO 11925 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
Introduction
This fire test method has been developed to define reaction to fire performance of products. The method
specifies a test for determining the ignitability of products by direct small-flame impingement under zero
impressed irradiance using vertically oriented test specimens.
Although the method is designed to assess ignitability, this is addressed by measuring the spread of a small
flame up the vertical surface of a specimen following application of a small flame to either the surface or
edge of a specimen for either 15 s or 30 s. The determination of the production of flaming droplets/particles
depends on whether the filter paper placed beneath the specimen ignites.
Details on the precision of the test method is given in Annex A.
Details on testing not essentially flat end-use products is given in Annex B.
Details on testing perforated end-use products is given in Annex C.

v
FINAL DRAFT International Standard ISO/FDIS 11925-2:2025(en)
Reaction to fire tests — Ignitability of products subjected to
direct impingement of flame —
Part 2:
Single-flame source test
1 Scope
This document specifies a method of test for determining the ignitability of products by direct small flame
impingement under zero impressed irradiance using vertically oriented test specimens.
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 13943, Fire safety — Vocabulary
ISO 14697, Reaction-to-fire tests — Guidance on the choice of substrates for building and transport products
EN 13238, Reaction to fire tests for building products — Conditioning procedures and general rules for selection
of substrates
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13943 and the following 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 https:// www .electropedia .org/
3.1
product
material, element or component about which information is required
[SOURCE: ISO 1716:2018, 3.1]
3.2
essentially flat product
product having one of the following characteristics:
a) a planar exposed surface;
b) a planar exposed surface with a surface irregularity that is evenly distributed over the exposed surface,
provided that:
— at least 50 % of the surface of a representative square area of 250 mm × 250 mm lies within a depth
of 6 mm from a plane taken across the highest points on the exposed surface, or

— for a surface containing cracks, fissures or holes, these do not exceed 6,5 mm in width or 10 mm in
depth, and that the total area of such cracks, fissures or holes at the surface does not exceed 30 % of
a representative square area of 250 mm × 250 mm of the exposed surface
3.3
flaming droplet/particle
material separating from the specimen during the fire test procedure and igniting the filter paper beneath
the specimen
3.4
multi-layered product
product composed of two or more layers of different materials, which can be either substantial and/or non-
substantial
3.5
sustained flaming
persistence of flame for a period greater than 3 s
3.6
ignition
presence of sust
...


ISO/TC 92/SC 1
Secretariat: BSI
Date: 2025-07-03xx
Reaction to fire tests — Ignitability of products subjected to direct
impingement of flame —
Part 2:
Single-flame source test
Essais de réaction au feu — Allumabilité de produits soumis à l'incidence directe de la flamme — —
Partie 2: Essai à l'aide d'une source à flamme unique
FDIS stage
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'sISO’s member body in the country of the requester.
ISO Copyright Officecopyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email:
E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland.
ii
Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test apparatus . 2
5 Test specimen . 4
5.1 Preparation . 4
5.2 Dimensions . 4
5.3 Products which are not essentially flat . 4
5.4 Number of specimens . 4
5.5 Substrates . 5
6 Conditioning . 5
7 Test procedure . 5
7.1 General . 5
7.2 Two flame application times are available, 15 s or 30 s, as required by the sponsor. The
start time of the test is on application of the flame.Preliminary operations . 5
7.3 Testing operations . 5
7.4 Duration of test . 7
8 Expression of results . 7
9 Test report . 8
Annex A (informative) Precision of test method . 22
Annex B (normative) Testing not essentially flat end‑use products . 25
Annex C (normative) Testing perforated end‑use products . 26
Bibliography . 27

iii
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 92, Fire safety, Subcommittee SC 1, Fire
initiation and growth, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 127, Fire safety in buildigns, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This fifth edition cancels and replaces the fourth edition (ISO 11925-2:2020), which has been technically
revised.
The main changes are as follows:
— — Notenote on the evaluation of the flame tip;
— — Revisionrevision of all figures.
A list of all parts in the ISO 11925 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
Introduction
This fire test method has been developed to define reaction to fire performance of products. The method
specifies a test for determining the ignitability of products by direct small-flame impingement under zero
impressed irradiance using vertically oriented test specimens.
Although the method is designed to assess ignitability, this is addressed by measuring the spread of a small
flame up the vertical surface of a specimen following application of a small flame to either the surface or edge
of a specimen for either 15 s or 30 s. The determination of the production of flaming droplets/particles
depends on whether the filter paper placed beneath the specimen ignites.
Details on the precision of the test method is given in Annex AAnnex A (informative).
Details on testing not essentially flat end-use products is given in Annex BAnnex B (normative).
Details on testing perforated end-use products is given in Annex CAnnex C (normative).
v
Reaction to fire tests — Ignitability of products subjected to direct
impingement of flame — —
Part 2:
Single--flame source test
1 Scope
This document specifies a method of test for determining the ignitability of products by direct small flame
impingement under zero impressed irradiance using vertically oriented test specimens.
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 13943, Fire safety — Vocabulary
ISO 14697, Reaction-to-fire tests — Guidance on the choice of substrates for building and transport products
EN 13238, Reaction to fire tests for building products — Conditioning procedures and general rules for selection
of substrates
ISO 13943, Fire safety — Vocabulary
ISO 14697, Reaction-to-fire tests — Guidance on the choice of substrates for building and transport products
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13943 and the following 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 https://www.electropedia.org/
3.1 3.1
product
material, element or component about which information is required [defined in
[SOURCE: ISO 1716:2018-05, 3.1 and EN 14309:2015-12, 3.1.2.9]]
Commented [eXtyles1]: No section matches the in-text
citation "3.1.2.9". Please supply the missing section or delete
the citation.
3.2 3.2
essentially flat product
product having one of the following characteristics:
a) a) a planar exposed surface;
b) b) a planar exposed surface with a surface irregularity that is evenly distributed over the exposed
surface, provided that:
— — at least 50 % of the surface of a representative square area of 250 mm × 250 mm lies within a
depth of 6 mm from a plane taken across the highest points on the exposed surface, or
— — for a surface containing cracks, fissures or holes, these do not exceed 6,5 mm in width or 10 mm
in depth, and that the total area of such cracks, fissures or holes at the surface does not exceed 30 %
of a representative square area of 250 mm × 250 mm of the exposed surface
3.3 3.3
flaming droplet/particle
material separating from the specimen during the fire test procedure and igniting the filter paper beneath the
specimen
3.4 3.4
multi-‑layered product
product composed of two or more layers of different materials, which can be either substantial and/or non-
substantial
3.5 3.5
sustained flaming
persistence of flame for a period greater than 3 s
3.6 3.6
ignition
presence of sustained flaming
4 Test apparatus
4.1 4.1 Test room, capable of providing an environment at (23 ± 5) °C and a relative humidity of
(50 ± 20) %.
NOTE It has been found that a partially darkened room assists with the perception of small surface flames.
4.2 4.2 Combustion chamber, consisting of an enclosure constructed from stainless steel sheets
with heat-resistant, glazed doors provided for access and observation in at least the front and one lateral side
(see Figure 1Figure 1).). Ventilation of the enclosure shall be free through the square box section base in
the bottom of the chamber. This shall be made of stainless steel of 1,5 mm thickness, 50 mm in height, with
the open square area being 25 mm × 25 mm. To make free ventilation possible, the chamber shall stand on
40 mm high supports which provide a gap on the lateral sides of the combustion chamber. The air velocity
measured on the central axis in the chimney of the combustion chamber shall be (0,7 ± 0,1) m/s, measured
with the burner only ignited and with the ventilation hood “on”. The combustion chamber shall be situated
under a suitably ventilated hood.
4.3 4.3 Ignition source, consisting of burner constructed as shown in Figure 2Figure 2 and
designed so that it can be used vertically or be tilted at 45° with respect to the vertical axis. The burner shall
be mounted onto a horizontal plate so that it moves smoothly forwards and backwards in a horizontal plane
along the centreline of the combustion chamber.
The burner shall be fitted with a fine adjustment valve to ensure accurate control of the flame height.
4.4 4.4 Fuel, consisting of commercial propane of 95 % minimum purity. In order to obtain flame
stability with the burner tilted at 45°, the gas pressure shall be between 10 kPa and 50 kPa.
4.5 4.5 Specimen holder, consisting of two stainless steel U-shaped frames. The thickness of the
frames shall be (5 ± 1) mm. The dimensions of the frame shall be as shown in Figure 3Figure 3. The frame
shall hang vertically from the support (see 4.64.6 and Figure 7Figure 7)) such that the underside of the
specimen is exposed directly to the flame along its centreline and edges (see Figure 8Figure 8).). The two
halves of the specimen holder shall be held together by screws or clamps to
...


PROJET FINAL
Norme
internationale
ISO/TC 92/SC 1
Essais de réaction au feu —
Secrétariat: BSI
Allumabilité de produits soumis à
Début de vote:
l’incidence directe de la flamme —
2025-08-11
Partie 2:
Vote clos le:
2025-10-06
Essai à l’aide d’une source à flamme
unique
Reaction to fire tests — Ignitability of products subjected to
direct impingement of flame —
Part 2: Single-flame source test
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
NORMES POUVANT
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
Numéro de référence
PROJET FINAL
Norme
internationale
ISO/TC 92/SC 1
Essais de réaction au feu —
Secrétariat: BSI
Allumabilité de produits soumis à
Début de vote:
l’incidence directe de la flamme —
2025-08-11
Partie 2:
Vote clos le:
2025-10-06
Essai à l’aide d’une source à
flamme unique
Reaction to fire tests — Ignitability of products subjected to
direct impingement of flame —
Part 2: Single-flame source test
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
DOCUMENT PROTÉGÉ PAR COPYRIGHT
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
© ISO 2025 INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
NORMES POUVANT
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse Numéro de référence
ii
Sommaire Page
Avant-propos .iv
Introduction .v
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Appareillage d’essai . 2
5 Éprouvette . 4
5.1 Préparation .4
5.2 Dimensions .4
5.3 Produits qui ne sont pas globalement plans .4
5.4 Nombre d’éprouvettes .5
5.5 Substrats .5
6 Conditionnement . 5
7 Mode opératoire d’essai . 5
7.1 Généralités .5
7.2 Deux durées d’application de la flamme sont disponibles, 15 s ou 30 s, en fonction
des spécifications du demandeur. L’essai commence au moment de l’application de la
flamme. Opérations préliminaires.5
7.3 Procédures d’essai .6
7.4 Durée de l’essai .8
8 Expression des résultats . 8
9 Rapport d’essai . 8
Annexe A (informative) Fidélité de la méthode d’essai .23
Annexe B (normative) Essais sur produits non globalement plans dans leur utilisation finale .26
Annexe C (normative) Essais sur des produits perforés dans leur utilisation finale .27
Bibliographie .28

iii
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’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’ISO ne prend pas position quant à la preuve, à la validité et à l’applicabilité de
tout droit de brevet revendiqué à cet égard. À la date de publication du présent document, l’ISO n’avait pas
reçu notification qu’un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d’avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l’adresse
www.iso.org/brevets. L’ISO ne saurait être tenue pour responsable de ne pas avoir identifié de tels droits de
propriété et averti de leur existence.
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 nature volontaire des normes, 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’Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 92, Sécurité incendie, sous-comité SC 1,
Démarrage et développement du feu, en collaboration avec le comité technique CEN/TC 127, Sécurité incendie
dans les bâtiments, du Comité européen de normalisation (CEN), conformément à l’Accord de coopération
technique entre l’ISO et le CEN (Accord de Vienne).
Cette cinquième édition annule et remplace la quatrième édition (ISO 11925-2:2020), qui a fait l’objet d’une
révision technique.
Les principales modifications sont les suivantes:
— note sur l’évaluation de la pointe de la flamme;
— révision de toutes les figures.
Une liste de toutes les parties de la série ISO 11925 se trouve sur le site web de l’ISO.
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes se
trouve à l’adresse www.iso.org/fr/members.html.

iv
Introduction
La présente méthode d’essai au feu a été mise au point pour définir les performances de réaction au feu de
produits. La méthode spécifie un essai permettant de déterminer l’allumabilité des produits par incidence
directe d’une petite flamme sous éclairement énergétique nul en utilisant des éprouvettes en position
verticale.
Bien que la méthode soit conçue pour évaluer l’allumabilité, elle est traitée en mesurant la propagation vers
le haut d’une petite flamme sur la surface verticale d’une éprouvette après l’application d’une petite flamme
sur la surface ou sur les bords d’une éprouvette pendant 15 s ou 30 s. La détermination de la production de
gouttelettes/débris enflammés dépend de l’allumage du papier-filtre placé au-dessous de l’éprouvette.
L’Annexe A fournit des détails sur la précision de la méthode d’essai.
L’Annexe B fournit des détails concernant les essais sur produits non globalement plans dans leur
utilisation finale.
L’Annexe C fournit des détails concernant les essais sur des produits perforés dans leur utilisation finale.

v
PROJET FINAL Norme internationale ISO/FDIS 11925-2:2025(fr)
Essais de réaction au feu — Allumabilité de produits soumis à
l’incidence directe de la flamme —
Partie 2:
Essai à l’aide d’une source à flamme unique
1 Domaine d’application
Le présent document spécifie une méthode d’essai permettant de déterminer l’allumabilité des produits
par incidence directe d’une petite flamme sous éclairement énergétique nul en utilisant des éprouvettes en
position verticale.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur
contenu, des exigences 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 13943, Sécurité au feu — Vocabulaire
ISO 14697, Essais de réaction au feu — Lignes directrices sur le choix de subjectiles pour les produits du bâtiment
et du transport
EN 13238, Essais de réaction au feu des produits de construction — Modes opératoires de conditionnement et
règles générales de sélection des substrats
3 Termes et définitions
Pour les besoins du présent document, les termes et les définitions de l’ISO 13943 ainsi que les suivants
s’appliquent.
L’ISO et l’IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en normalisation,
consultables aux adresses suivantes:
— ISO Online browsing platform: disponible à l’adresse https:// www .iso .org/ obp
— IEC Electropedia: disponible à l’adresse https:// www .electropedia .org/
3.1
produit
matériau, élément ou composant sur lequel des informations sont requises
[SOURCE: ISO 1716:2018, 3.1]
3.2
produit globalement plan
produit ayan
...

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