Reaction to fire tests - Ignitability of products subjected to direct impingement of flame - Part 2: Single-flame source test (ISO 11925-2:2020)

EN-ISO 11925-2 specifies a method of test for determining the ignitability ofproducts by direct small flame impingement under zero impressed irradiance usingvertically oriented test specimens. Information on the precision of the testmethod is given in Annex A (informative).Information on testing not essentiallyflat end-use products is given in Annex B (normative).Information on testingperforated end-use products is given in Annex C (normative).

Prüfungen zum Brandverhalten - Entzündbarkeit von Produkten bei direkter Flammeneinwirkung - Teil 2: Einzelflammentest (ISO 11925-2:2020)

Dieses Dokument legt ein Prüfverfahren fest, um die Entzündbarkeit von Produkten, die in vertikaler Anordnung geprüft werden, mit Hilfe einer direkt einwirkenden kleinen Flamme ohne zusätzliche Wärmebestrahlung zu ermitteln.
Hinweise zur Präzision des Prüfverfahrens sind Anhang A (informativ) zu entnehmen.
Hinweise zur Prüfung von Produkten für die Endanwendung, die im Wesentlichen nicht eben sind, sind Anhang B (normativ) zu entnehmen.
Hinweise zur Prüfung von perforierten Endprodukten sind Anhang C (normativ) zu entnehmen.

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 (ISO 11925-2:2020)

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.

Preskusi odziva na ogenj - Sposobnost vžiga gradbenih proizvodov v neposrednem stiku s plamenom - 2. del: Preskus z enim gorilnikom (ISO 11925-2:2020)

General Information

Status
Published
Public Enquiry End Date
09-Dec-2018
Publication Date
23-Apr-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
31-Mar-2020
Due Date
05-Jun-2020
Completion Date
24-Apr-2020

Relations

Buy Standard

Standard
EN ISO 11925-2:2020
English language
36 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day
Draft
prEN ISO 11925-2:2018
English language
33 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 11925-2:2020
01-maj-2020
Nadomešča:
SIST EN ISO 11925-2:2011
SIST EN ISO 11925-2:2011/AC:2011
Preskusi odziva na ogenj - Sposobnost vžiga gradbenih proizvodov v
neposrednem stiku s plamenom - 2. del: Preskus z enim gorilnikom (ISO 11925-
2:2020)
Reaction to fire tests - Ignitability of products subjected to direct impingement of flame -
Part 2: Single-flame source test (ISO 11925-2:2020)
Prüfungen zum Brandverhalten - Entzündbarkeit von Produkten bei direkter
Flammeneinwirkung - Teil 2: Einzelflammentest (ISO 11925-2:2020)
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 (ISO 11925-2:2020)
Ta slovenski standard je istoveten z: EN ISO 11925-2:2020
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
SIST EN ISO 11925-2:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 11925-2:2020

---------------------- Page: 2 ----------------------
SIST EN ISO 11925-2:2020


EN ISO 11925-2
EUROPEAN STANDARD

NORME EUROPÉENNE

March 2020
EUROPÄISCHE NORM
ICS 13.220.50 Supersedes EN ISO 11925-2:2010
English Version

Reaction to fire tests - Ignitability of products subjected to
direct impingement of flame - Part 2: Single-flame source
test (ISO 11925-2:2020)
Essais de réaction au feu - Allumabilité de produits Prüfungen zum Brandverhalten - Entzündbarkeit von
soumis à l'incidence directe de la flamme - Partie 2: Produkten bei direkter Flammeneinwirkung - Teil 2:
Essai à l'aide d'une source à flamme unique (ISO Einzelflammentest (ISO 11925-2:2020)
11925-2:2020)
This European Standard was approved by CEN on 4 February 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11925-2:2020 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
SIST EN ISO 11925-2:2020
EN ISO 11925-2:2020 (E)
Contents Page
European foreword . 3

2

---------------------- Page: 4 ----------------------
SIST EN ISO 11925-2:2020
EN ISO 11925-2:2020 (E)
European foreword
This document (EN ISO 11925-2:2020) has been prepared by Technical Committee ISO/TC 92 "Fire
safety" in collaboration with Technical Committee CEN/TC 127 “Fire safety in buildings” the secretariat
of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2020, and conflicting national standards
shall be withdrawn at the latest by September 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11925-2:2010.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 11925-2:2020 has been approved by CEN as EN ISO 11925-2:2020 without any
modification.

3

---------------------- Page: 5 ----------------------
SIST EN ISO 11925-2:2020

---------------------- Page: 6 ----------------------
SIST EN ISO 11925-2:2020
INTERNATIONAL ISO
STANDARD 11925-2
Fourth edition
2020-02
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
Reference number
ISO 11925-2:2020(E)
©
ISO 2020

---------------------- Page: 7 ----------------------
SIST EN ISO 11925-2:2020
ISO 11925-2:2020(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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 2020 – All rights reserved

---------------------- Page: 8 ----------------------
SIST EN ISO 11925-2:2020
ISO 11925-2:2020(E)

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 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
© ISO 2020 – All rights reserved iii

---------------------- Page: 9 ----------------------
SIST EN ISO 11925-2:2020
ISO 11925-2:2020(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 92, Fire safety, Subcommittee SC 1, Fire
initiation and growth.
This fourth edition cancels and replaces the third edition (ISO 11925-2:2010), which has been
technically revised. It also incorporates the Technical Corrigendum ISO 11925-2:2010/Cor1: 2011.
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 © ISO 2020 – All rights reserved

---------------------- Page: 10 ----------------------
SIST EN ISO 11925-2:2020
ISO 11925-2:2020(E)

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 (match-sized) 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 or not the filter paper placed beneath the specimen
ignites.
© ISO 2020 – All rights reserved v

---------------------- Page: 11 ----------------------
SIST EN ISO 11925-2:2020

---------------------- Page: 12 ----------------------
SIST EN ISO 11925-2:2020
INTERNATIONAL STANDARD ISO 11925-2:2020(E)
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.
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).
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.
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 http:// www .electropedia .org/
3.1
product
material, element or component about which information is required
3.2
essentially flat product
product having one of the following characteristics:
a) a planar exposed surface;
© ISO 2020 – All rights reserved 1

---------------------- Page: 13 ----------------------
SIST EN ISO 11925-2:2020
ISO 11925-2:2020(E)

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 droplets/particles
material separating from the specimen during the fire test procedure and igniting the filter paper
beneath the specimen
3.4
multi-layered products
product composed of two or more layers of different materials, which can be either substantial and/or
non-substantial
[SOURCE: EN 13501-1:2018-12, 3.1.5 and 3.1.6]
3.5
sustained flaming
persistence of flame for a period greater than 3 s
3.6
ignition
presence of sustained flaming
4 Test apparatus
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 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 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 Ignition source, consisting of burner constructed as shown in Figure 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 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.
2 © ISO 2020 – All rights reserved

---------------------- Page: 14 ----------------------
SIST EN ISO 11925-2:2020
ISO 11925-2:2020(E)

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 3. The frame shall hang
vertically from the support (see 4.6 and Figure 7) such that the underside of the specimen is exposed
directly to the flame along its centreline and edges see Figure 8. The two halves of the specimen holder
shall be held together by screws or clamps to prevent the specimen warping.
It is important that the technique of clamping used be capable of restraining the specimen for the total
duration of the test.
NOTE Small pins of approximately 1 mm in length incorporated on the surface of the frame to which the
specimen is attached have been found suitable.
For multi-layered products, a typical test frame as shown in Figure 4 shall be used when carrying out
the prescribed additional set of tests on multi-layer test specimens of thickness greater than 10 mm
according to 7.3.3.2.3.
For the mounting and fixing of loose fill material, the following applies.
a) A specimen holder as shown in Figure 5 shall be used.
b) When making the specimens for testing, the surface of the loose fill material specimen shall be as
even as possible.
c) A wire lacing as shown in Figure 6 shall be used to retain the specimen if material falls from the
specimen holder. A wire of 0,2 mm diameter shall be used to form 11 rows vertically in front of the
opening to hold the loose fill material in place. The wire lacing will have the shape of a harp.
d) If the material is a mixture of various grain sizes, the release of smaller particles from the open
central surface does not justify the use of the harp.
e) It is deemed sufficient to carry out the tests with a surface flame attack. Edge flame attack tests are
not necessary.
4.6 Support, consisting of a vertical stand to which the specimen holder is attached such that it hangs
vertically and exposes its open edge containing the specimen to the burner flame (see Figure 7).
The distance between the underside of the specimen and the top of horizontal plate above the metal grid
shall be (125 ± 10) mm for edge flame impingement and (85 ± 10) mm for surface flame impingement.
4.7 Timing device, capable of recording elapsed time to the nearest second and which shall be
accurate to within 5 s in 1 h.
0 0
4.8 Template, consisting of one metal plate 250 mm long and 90 mm wide.
() ()
−1 −1
4.9 Flame checking devices.
4.9.1 Flame-height measuring device, capable of indicating a flame height of 20 mm (see Figure 9)
when located against a fixed point of the burner. The tolerance on the flame-height measuring device
shall be ±0,1 mm.
The flame height shall be measured from the upper edge of the burner to the yellow tip of the flame.
The outer blue halo of the flame may not be considered. This check shall be conducted before testing
each specimen.
4.9.2 Burner spacer for edge flame impingement, removable, 16 mm long, which can be mounted
at the burner orifice to check the distance from the pre-set flame contact point on the specimen (see
Figure 10).
© ISO 2020 – All rights reserved 3

---------------------- Page: 15 ----------------------
SIST EN ISO 11925-2:2020
ISO 11925-2:2020(E)

4.9.3 Burner spacer for surface flame impingement, removable, cone-shaped, which can be
mounted at the burner orifice to check the fixed distance of 5 mm between the burner edge and specimen
surface (see Figure 11).
4.10 Anemometer, thermal anemometer with an accuracy of ±0,1 m/s, for measuring the airflow
velocity in the upper outlet of the combustion chamber (see 4.2 and Figure 1).
4.11 Filter paper and tray. The paper shall be new undyed filter paper with a mass/unit area of
2
(75 ± 15) g/m and an ash content of less than 0,1 %. The tray shall be 100 mm × 50 mm and 10 mm deep
and made of aluminium foil. The tray is placed beneath the specimen holder and is replaced between tests.
4.12 Apparatus to allow observation of the reverse face of the specimen. For some materials, it is
sometimes necessary to observe the flame on the reverse face of the specimen as well as the exposed face.
Provision shall therefore be made to enable the operator to view both sides of the specimen at the
same time. One method by which this may be achieved is to place a mirror such that the backside
of the specimen can be monitored. The mirror shall not be placed above the specimen, in order to
avoid disturbance of the airflow. The design and location of the mirror shall be appropriate for the
construction of the equipment and the available ambient lighting. The result observed on the reverse
face shall be treated as if it occurred on the front side.
5 Test specimen
5.1 Preparation
The test specimen shall be cut from a sample which is representative of the product to be tested using
the templates specified in 4.8.
5.2 Dimensions
+2 +2
The dimensions of the test specimens shall be 250 mm long by 90 mm wide.
() ()
−2 −2
Specimens normally having a thickness of 60 mm or less shall be tested using their full thickness.
Specimens normally having a thickness greater than 60 mm shall be reduced to a thickness of 60 mm
by cutting away the unexposed surface. If it is necessary to reduce the specimen size in this manner, the
cut surface shall not be exposed to the flame.
For products which are normally manufactured in sizes less than the test specimen, a test sample of
appropriate size shall be specifically produced for the test.
5.3 Products which are not essentially flat
When the product is not an essentially flat product, the specimens may be tested in the form of their
end use (e.g. pipe insulation). The product shall be supplied in its entirety or as specimens of lengths
of 250 mm.
5.4 Number of specimens
5.4.1 For each exposure condition, a minimum of six representative specimens of the product shall be
tested. Three specimens shall be cut lengthwise and three crosswise.
5.4.2 If a product under test is asymmetric through its thickness and in practice either face may be
exposed to a source of ignition, test two specimens on each face to find the critical point of impingement.
For the critical impingement point a full test series shall be conducted.
4 © ISO 2020 – All rights reserved

---------------------- Page: 16 ----------------------
SIST EN ISO 11925-2:2020
ISO 11925-2:2020(E)

5.4.3 Where a product has areas of its surface which are distinctly different, but each of these separate
areas can satisfy the surface characteristics for essentially flat products, two tests shall be conducted
at each point of flame impingement. The critical impingement point shall be found. For the critical
impingement point a full test series shall be conducted.
5.4.4 If a product is installed with covered edges, but can also be used with unprotected edges, tests
shall be performed on both covered and uncovered specimens.
5.5 Substrates
Where a substrate is used, it shall be selected in accordance with ISO 14697 or EN 13238.
Care is needed when preparing test specimens for bottom-edge exposure of materials applied to
substrates, since in practice the substrate may extend beyond the bottom of the material to be tested
and not itself be subject to edge exposure. The configuration of the test specimen should reflect the
practical aspects such as type of substrate and fixing to substrate.
NOTE Additional advice on the use of substrates can be found in any relevant product standard.
6 Conditioning
Test specimens and filter paper shall be conditioned in accordance with EN 13238.
7 Test procedure
7.1 General
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.
7.2 Preliminary operations
7.2.1 Check the required airflow velocity in the chimney of the combustion chamber (see 4.2).
7.2.2 Remove the set of six test specimens and the filter paper from the conditioning environment and
test them within 30 min. If necessary, the test specimen can be transferred from the conditioning room to
the test apparatus in a sealed container.
7.2.3 Clamp the test specimen in the specimen holder so that one end and both sides are covered by
the holder frames and the exposed end is 30 mm from the end of the frame (see Figures 3 to 6).
NOTE The operator can find it useful to mark the specimen holder such that the bottom edge of the test
specimen is always placed at this distance.
7.2.4 Check the distances of the burner from the specimen by means of the relevant spacer specified in
4.9.2 or 4.9.3 with the burner tilted at 45° (see Figures 7 and 8, as appropriate).
7.2.5 Position two pieces of filter paper in the aluminium foil tray beneath the specimen, not more
than 3 min before the start of the test.
7.3 Testing operations
WARNING — The attention of all persons concerned with managing and carrying out this test is
drawn to the fact that fire testing can be hazardous and that there is a possibility that toxic and/
© ISO 2020 – All rights reserved 5

---------------------- Page: 17 ----------------------
SIST EN ISO 11925-2:2020
ISO 11925-2:2020(E)

or harmful smoke and gases can be evolved during the test. Operational hazards can also arise
during the testing of specimens and the disposal of test residues.
WARNING — An assessment of all potential hazards and risks to health should be made and safety
precautions identified and provided. Written safety instructions should be issued. Appropriate
training should be given to relevant personnel. Laboratory personnel should ensure that they
follow written safety instructions at all times.
WARNING — Adequate means of extinguishin
...

SLOVENSKI STANDARD
oSIST prEN ISO 11925-2:2018
01-december-2018
Preskusi odziva na ogenj - Sposobnost vžiga gradbenih proizvodov v
neposrednem stiku s plamenom - 2. del: Preskus z enim gorilnikom (ISO/DIS 11925
-2:2018)
Reaction to fire tests - Ignitability of products subjected to direct impingement of flame -
Part 2: Single-flame source test (ISO/DIS 11925-2:2018)
Prüfungen zum Brandverhalten - Entzündbarkeit von Produkten bei direkter
Flammeneinwirkung - Teil 2: Einzelflammentest (ISO/DIS 11925-2:2018)
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 (ISO/DIS 11925-2:2018)
Ta slovenski standard je istoveten z: prEN ISO 11925-2
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
oSIST prEN ISO 11925-2:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 11925-2:2018

---------------------- Page: 2 ----------------------
oSIST prEN ISO 11925-2:2018
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11925-2
ISO/TC 92/SC 1 Secretariat: BSI
Voting begins on: Voting terminates on:
2018-09-26 2018-12-19
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
ICS: 13.220.50
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
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
ISO/CEN PARALLEL PROCESSING
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 11925-2:2018(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 2018

---------------------- Page: 3 ----------------------
oSIST prEN ISO 11925-2:2018
ISO/DIS 11925-2:2018(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
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 2018 – All rights reserved

---------------------- Page: 4 ----------------------
oSIST prEN ISO 11925-2:2018
ISO/DIS 11925-2:2018(E)

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 Preliminary operations . 5
7.3 Testing operations. 6
7.4 Duration of test . 7
8 Expression of results . 7
9 Test report . 8
Annex A (informative) Precision of test method .23
Annex B (normative) Testing not essentially flat end-use products .26
Annex C (normative) Testing perforated end-use products .27
Bibliography .28
© ISO 2018 – All rights reserved iii

---------------------- Page: 5 ----------------------
oSIST prEN ISO 11925-2:2018
ISO/DIS 11925-2:2018(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
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.
ISO 11925-2 was prepared by Technical Committee ISO/TC 92, Fire safety, Subcommittee SC 1, Fire
initiation and growth.
This edition cancels and replaces the previous edition (ISO 11925-2:2010), which has been technically
revised.
ISO 11925 consists of the following parts, under the general title Reaction to fire tests — Ignitability of
products subjected to direct impingement of flame:
— Part 1: Guidance on ignitability [Technical Report]
— Part 2: Single-flame source test
— Part 3: Multi-source test
iv © ISO 2018 – All rights reserved

---------------------- Page: 6 ----------------------
oSIST prEN ISO 11925-2:2018
ISO/DIS 11925-2:2018(E)

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 (match-sized) 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 depends on whether or not the filter paper placed beneath the specimen ignites.
© ISO 2018 – All rights reserved v

---------------------- Page: 7 ----------------------
oSIST prEN ISO 11925-2:2018

---------------------- Page: 8 ----------------------
oSIST prEN ISO 11925-2:2018
DRAFT INTERNATIONAL STANDARD ISO/DIS 11925-2:2018(E)
Reaction to fire tests — Ignitability of products subjected
to direct impingement of flame —
Part 2:
Single-flame source test
WARNING — The attention of all persons concerned with managing and carrying out this test is
drawn to the fact that fire testing can be hazardous and that there is a possibility that toxic and/
or harmful smoke and gases can be evolved during the test. Operational hazards can also arise
during the testing of specimens and the disposal of test residues.
WARNING — An assessment of all potential hazards and risks to health should be made and safety
precautions identified and provided. Written safety instructions should be issued. Appropriate
training should be given to relevant personnel. Laboratory personnel should ensure that they
follow written safety instructions at all times.
WARNING — Adequate means of extinguishing the specimen should be provided, bearing in
mind that some specimens can produce severe flaming during the test. A hand water spray or
an inert gas suppression system, e.g. compressed nitrogen, which can be directed to the burning
area, should be available together with other means, such as fire extinguishers.
WARNING — In some cases, smouldering can be difficult to extinguish completely and immersion
in water can be necessary.
1 Scope
This part of ISO 11925 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.
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.
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.
3.1
product
material, element or component about which information is required
© ISO 2018 – All rights reserved 1

---------------------- Page: 9 ----------------------
oSIST prEN ISO 11925-2:2018
ISO/DIS 11925-2:2018(E)

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 droplets flaming particle
material separating from the specimen during the fire test procedure and igniting the filter paper
beneath the specimen
3.4
multi-layered products
Product composed of two or more layers of different materials, which can be either substantial and
non-substantial (EN 13501-1).
3.5
sustained flaming
persistence of flame for a period greater than 3 s
3.6
ignition
presence of sustained flaming
4 Test apparatus
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 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 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 Ignition source, consisting of burner constructed as shown in Figure 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.
2 © ISO 2018 – All rights reserved

---------------------- Page: 10 ----------------------
oSIST prEN ISO 11925-2:2018
ISO/DIS 11925-2:2018(E)

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 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 3 a). The frame shall hang
vertically from the support (see 4.6 and Figure 4) such that the underside of the specimen is exposed
directly to the flame along its centreline and edges (see Figures 5 to 7). The two halves of the specimen
holder shall be held together by screws or clamps to prevent the specimen warping.
It is important that the technique of clamping used be capable of restraining the specimen for the total
duration of the test.
NOTE Small pins of approximately 1 mm in length incorporated on the surface of the frame to which the
specimen is attached have been found suitable.
For multilayered products, a typical test frame as shown in Figure 3 b) shall be used when carrying
out the prescribed additional set of tests on multilayer test specimens of thickness greater than 10 mm
according to 7.3.3.2.3.
For the mounting and fixing of loose fill material, the following applies.
c) A specimen holder as shown in Figure 3 c) shall be used.
d) When making the specimens for testing, the surface of the loose fill material specimen shall be as
even as possible.
e) A wire lacing shall be used to retain the specimen if material falls from the specimen holder. 0,2 mm
wire shall be used to form 11 rows vertically in front of the opening to hold the loose fill material in
place. The wire lacing will have the shape of a harp.
f) If the material is a mixture of various grain sizes, the release of smaller particles from the open
central surface does not justify the use of the harp.
g) It is deemed sufficient to carry out the tests with a surface flame attack. Edge flame attack tests are
not necessary.
4.6 Support, consisting of a vertical stand to which the specimen holder is attached such that it hangs
vertically and exposes its open edge containing the specimen to the burner flame (see Figure 4).
The distance between the underside of the specimen and the top of horizontal plate above the metal grid
shall be (125 ± 10) mm for edge flame impingement and (85 ± 10) mm for surface flame impingement.
4.7 Timing device, capable of recording elapsed time to the nearest second and which shall be
accurate to within 5 s in 1 h.
0 0
4.8 Template, consisting of one metal plate (250 ) mm long and (90 ) mm wide.
4.9 Flame checking devices
4.9.1 Flame-height measuring device, capable of indicating a flame height of 20 mm (see Figure 8)
when located against a fixed point of the burner. The tolerance on the flame-height measuring device
shall be ±0,1 mm.
The flame height shall be measured from the upper edge of the burner to the yellow tip of the flame.
This check shall be conducted before testing each specimen.
4.9.2 Burner spacer for edge flame impingement, removable, 16 mm long, which can be mounted at
the burner orifice to check the distance from the pre-set flame contact point on the specimen (see Figure 9).
© ISO 2018 – All rights reserved 3

---------------------- Page: 11 ----------------------
oSIST prEN ISO 11925-2:2018
ISO/DIS 11925-2:2018(E)

4.9.3 Burner spacer for surface flame impingement, removable, cone-shaped, which can be
mounted at the burner orifice to check the fixed distance of 5 mm between the burner edge and specimen
surface (see Figure 9).
4.10 Anemometer, hot wire, with an accuracy of ±0,1 m/s, for measuring the airflow velocity in the
upper outlet of the combustion chamber (see 4.2 and Figure 1).
4.11 Filter paper and tray. The paper shall be new undyed filter paper with a mass/unit area of (75 ±
2
15) g/m and an ash content of less than 0,1 %. The filter paper shall be kept in a desiccator prior to use
in the test. The tray shall be 100 mm × 50 mm and 10 mm deep with a thickness of 0,175 ± 0,025 mm,
made of aluminium foil. The tray is placed beneath the specimen holder and is replaced between tests.
4.12 Apparatus to allow observation of the reverse face of the specimen. For some materials, it is
sometimes necessary to observe the flame on the reverse face of the specimen as well as the exposed face.
Provision shall therefore be made to enable the operator to view both sides of the specimen at the
same time. One method by which this may be achieved is to place a mirror such that the backside
of the specimen can be monitored, The mirror shall not be placed above the specimen, in order to
avoid disturbance of the airflow. The design and location of the mirror shall be appropriate for the
construction of the equipment and the available ambient lighting. The result observed on the reverse
face shall be treated as if it occurred on the front side.
5 Test specimen
5.1 Preparation
The test specimen shall be cut from a sample which is representative of the product to be tested using
the templates specified in 4.8.
5.2 Dimensions
+2 +2
The dimensions of the test specimens shall be (250 ) mm long by (90 ) mm wide.
Specimens normally having a thickness of 60 mm or less shall be tested using their full thickness.
Specimens normally having a thickness greater than 60 mm shall be reduced to a thickness of 60 mm
by cutting away the unexposed surface. If it is necessary to reduce the specimen size in this manner, the
cut surface shall not be exposed to the flame.
For products which are normally manufactured in sizes less than the test specimen, a test sample of
appropriate size shall be specifically produced for the test.
5.3 Products which are not essentially flat
When the product is not an essentially flat product, the specimens may be tested in the form of their
end use (e.g. pipe insulation). The product shall be supplied in its entirety or as specimens of lengths
of 250 mm.
5.4 Number of specimens
5.4.1 For each exposure condition, a minimum of six representative specimens of the product shall be
tested. Three specimens shall be cut lengthwise and three crosswise.
4 © ISO 2018 – All rights reserved

---------------------- Page: 12 ----------------------
oSIST prEN ISO 11925-2:2018
ISO/DIS 11925-2:2018(E)

5.4.2 If a product under test is asymmetric through its thickness and in practice either face may be
exposed to a source of ignition, test two specimens on each face to find the critical point of impingement.
For the critical impingement point a full test series shall be conducted.
Where a product has areas of its surface which are distinctly different, but each of these separate areas
can satisfy the surface characteristics for essentially flat products, two tests shall be conducted at each
point of flame impingement. The critical impingement point shall be found.
5.4.3 If a product is installed with covered edges, but can also be used with unprotected edges, tests
shall be performed on both covered and uncovered specimens.
5.5 Substrates
Where a substrate is used, it shall be selected in accordance with EN 13238 or ISO 14697.
Care is needed when preparing test specimens for bottom-edge exposure of materials applied to
substrates, since in practice the substrate may extend beyond the bottom of the material to be tested
and not itself be subject to edge exposure. The configuration of the test specimen should reflect the
practical aspects such as type of substrate and fixing to substrate.
NOTE Additional advice on the use of substrates can be found in any relevant product standard.
6 Conditioning
Test specimens and filter paper shall be conditioned in accordance with EN 13238.
7 Test procedure
7.1 General
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.
7.2 Preliminary operations
7.2.1 Check the required airflow velocity in the chimney of the combustion chamber (see 4.2).
7.2.2 Remove the set of six test specimens from the conditioning environment and test them within 30
min. If necessary, the test specimen can be transferred from the conditioning room to the test apparatus
in a sealed container.
7.2.3 Clamp the test specimen in the specimen holder so that one end and both sides are covered by
the holder frames and the exposed end is 30 mm from the end of the frame (see Figure 3).
NOTE The operator can find it useful to mark the specimen holder such that the bottom edge of the test
specimen is always placed at this distance.
7.2.4 Check the distances of the burner from the specimen by means of the relevant spacer specified
in 4.9.2 or 4.9.3 with the burner tilted at 45° (see Figures 4 to 7, as appropriate).
Position two pieces of filter paper in the aluminum foil tray beneath the specimen, not more than 3 min
before the start of the test.
© ISO 2018 – All rights reserved 5

---------------------- Page: 13 ----------------------
oSIST prEN ISO 11925-2:2018
ISO/DIS 11925-2:2018(E)

7.3 Testing operations
7.3.1 Light the burner in the vertical position and allow the flame to stabilize. Adjust the burner valve
to give a flame height of 20 mm using the device specified in 4.9.1. This operation is carried out away
from the pre-set operating position to prevent accidental impingement of the flame on the test specimen.
The flame height shall be checked prior to each flame application.
NOTE It has been found useful to measure the flame height against a black background.
7.3.2 Tilt the burner at 45° with respect to its vertical axis and advance it horizontally until the flame
reaches the pre-set contact point with the test specimen.
Start the timing device at the moment the flame is brought into contact with the test specimen.
Apply the flame for 15 s or 30 s as required by the sponsor and then retract the burner in a smooth
continuous manner.
7.3.3 Exposure conditions.
Tests may need to be conducted to either surface exposure or edge exposure, or both.
NOTE Advice on exposure conditions can be given in the relevant product standards.
7.3.1.1 Surface exposure.
For all essentially flat products, the flame shall be applied on the centreline of the specimen, 40 mm
above the bottom edge (see Figure 9). Each different surface that could be exposed in practice shall be
tested (see 5.4.2).
7.3.1.2 Edge exposure.
7.3.3.2.1 For single-layer or multilayer, essentially flat products having a total thickness ≤ 3mm, the
flame shall be applied to the mid-point on the bottom of the test specimen (see Figure 5). For specimens
that are 3 mm or less the flame application at 90° is not required.
NOTE As the flame width is estimated at 5 mm then the flame will be impinging on the entire thickness of
the specimen.
7.3.3.2.2 For single-layer or multilayer, essentially flat products having a total thickness greater than 3
mm, the flame shall be applied to the centre of the width of the bottom edge of the test specimen 1,5 mm
behind the surface (see Figure 6).
For specimens between 3-6 mm there is only one application point in the centreline of the bottom edge
of the thickness.
For combined layers between 6-9 mm there are two application points at the third points of the
specimen.
If the layers of a multilayered product with a total thickness greater than 9 mm, are thicker than 6 mm
the flame shall be applied through the centreline of each layer. Identical layers do not have to be tested
more than once.
If the layers of a multilayer product with a total thickness greater than 9 mm, are less than 6 mm thick
the flame shall be applied across a number of layers so that each layer has been exposed to the ignition
source. Identical layers do not have to be tested more than once.
Thicker combined layers > 9 mm can be addressed in a similar way (see Fig.7).
6 © ISO 2018 – All rights reserved

---------------------- Page: 14 ----------------------
oSIST prEN ISO 11925-2:2018
ISO/DIS 11925-2:2018(E)

If a thin layer less than 1 mm is an external layer of a product this does not need to be tested at 90°. For
thin layers or a combination of layers adjacent to layers that are larger than 1 mm then this layer shall
be tested.
7.3.3.2.3 For all multilayer products greater than 10 mm total thickness, an additional set of tests shall
be carried out with the specimen turned at 90° round its vertical axis and the flame impinging at the
bottom edge of the centreline of the underside of each different layer (see Figure 7).
If it is known and stated by the manufacturer that two or more layers in a product are identical then
only one of the layers need to be tested.
The flame application point which gives the worst result shall be determined by performing at least
two tests for each possible flame application point. The results should be compared and a complete test
of six specimens shall be conducted using the flame application point which gives the worst result.
7.3.4 For products that are not essentially flat products and which are to be tested in their end-use
form, the flame shall be applied as specified in 7.3.3.1 and 7.3.3.2. A full description of the method of
retention shall be given in the test report.
The fl
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.