EN ISO 11925-2:2002

SLOVENSKI STANDARD
01-september-2002
Preskusi odziva na ogenj - Sposobnost vžiga gradbenih proizvodov v
neposrednem stiku s plamenom - 2. del: Preskus z enim gorilnikom (ISO 11925-
2:2002)
Reaction to fire tests - Ignitability of building products subjected to direct impingement of
flame - Part 2: Single-flame source test (ISO 11925-2:2002)
Prüfungen zum Brandverhalten von Bauprodukten - Teil 2: Entzündbarkeit bei direkter
Flammeneinwirkung (ISO 11925-2:2002)
Essais de réaction au feu - Allumabilité des produits de bâtiment soumis a l'incidence
directe de la flamme - Partie 2: Essai a l'aide d'une source a flamme unique (ISO 11925-
2:2002)
Ta slovenski standard je istoveten z: EN ISO 11925-2:2002
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 11925-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2002
ICS 13.220.50
English version
Reaction to fire tests - Ignitability of building products subjected
to direct impingement of flame - Part 2: Single-flame source test
(ISO 11925-2:2002)
Essais de réaction au feu - Allumabilité des produits de Brandverhalten von Baustoffen - Endzündbarkeit von
bâtiment soumis à l'incidence directe de la flamme - Partie Bauprodukten bei direkter Flammeneinwirkung - Teil 2:
2: Essai à l'aide d'une source à flamme unique (ISO Einflammentest (ISO 11925-2:2002)
11925-2:2002)
This European Standard was approved by CEN on 3 May 2001.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11925-2:2002 E
worldwide for CEN national Members.

Contents
page
Foreword .3
Introduction .4
1 Scope.5
2 Normative references.5
3 Terms and definitions.5
4 Test apparatus.6
4.1 Test room.6
4.2 Combustion chamber .6
4.3 Ignition source.6
4.4 Fuel .6
4.5 Specimen holder .6
4.6 Support.7
4.7 Timing device .7
4.8 Template.7
4.9 Flame checking devices .7
4.10 Anemometer .7
4.11 Filter paper and tray.8
5 Test specimen .8
5.1 Preparation .8
5.2 Dimensions .8
5.3 Products which are not essentially flat.8
5.4 Number.8
5.5 Substrates.9
6 Conditioning .9
7 Test procedure .9
7.1 General .9
7.2 Preliminary operations .9
7.3 Testing operations .9
7.4 Duration of test.10
8 Expression of results.11
9 Test report.11
Annex A (normative) Procedure for products which melt and shrink .21
A.1 General .21
A.2 Test apparatus.21
A.3 Test specimen .21
A.4 Test procedure .21
A.5 Expression of results.22
Annex B (informative) Precision of test method .26
Foreword
The text of EN ISO 11925-2:2002 has been prepared by CEN /TC 127 “Fire safety in buildings”, the
Secretariat of which is held by BSI, in collaboration with Technical Committee ISO/TC 92 “Fire safety”.
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 August 2002, and conflicting national standards shall
be withdrawn at the latest by December 2003.
Annex A is normative. Annex B is informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, the Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Introduction
Safety warning
The attention of all persons concerned with managing and carrying out this test is drawn to the fact
that fire testing may be hazardous and that there is a possibility that toxic and/or harmful smoke and
gases may be evolved during the test. Operational hazards may also arise during the testing of
specimens and the disposal of test residues.
An assessment of all potential hazards and risks to health should be made and safety precautions
should be 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.
Adequate means of extinguishing the specimen should be provided, bearing in mind that some
specimens may produce severe flaming during the test. A hand water spray or compressed nitrogen
which can be directed to the burning area should be available with other means, such as fire
extinguishers etc.
In some cases, smouldering may be difficult to extinguish completely and immersion in water may be
necessary.
1 Scope
This European Standard specifies a method of test for determining the ignitability of building products
by direct small flame impingement under zero impressed irradiance using specimens tested in a
vertical orientation.
The products that melt and shrink away from the flame without being ignited may be addressed by the
additional procedure given in annex A.
Information on the precision of the test method is given in annex B.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text, and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
EN 13238, Reaction to fire tests for building products — Conditioning procedures and general rules
for selection of substrates.
EN ISO 13943, Fire safety — Vocabulary (ISO 13943:1999).
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN ISO 13943,
together with the following, apply:
3.1
product
material, element or component about which information is required
3.2
essentially flat product
a 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:
i) 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
ii) for a surface containing cracks, fissures or holes which do not exceed 6,5 mm in width
nor 10 m in depth. 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 debris
material separating from the specimen during the fire test procedure and continuing to flame. For the
purposes of this standard, ignition of the filter paper beneath the specimen indicates flaming debris
3.4
sustained flaming
the persistence of flame for a period greater than 3 s
3.5
ignition
the presence of sustained flaming
4 Test apparatus
4.1 Test room
A 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
An enclosure (see Figure 1) constructed from stainless steel sheets, with heat resistant, glazed doors
provided for access and observation in at least the front and one lateral side. 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 (see Figure 1). 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 gap between
the supports at the front of the chamber shall be closed. The air velocity measured in the chimney of
the combustion chamber, as shown in Figure 1, shall be (0,7 ± 0,1) m/s, measured with the pilot
burner only ignited and with the ventilation hood ‘on’.
The combustion chamber shall be situated under a suitably ventilated hood.
4.3 Ignition source
A burner is 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
The fuel shall be commercial propane 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
The specimen holder consists of a do
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