1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 11925-2:2010Reaction to fire tests Ignitability of products subjected to direct impingement of flamePart 2: Single-flame source testBS EN ISO 11925-2:2010 BRITISH STAND
2、ARDNational forewordThis British Standard is the UK implementation of EN ISO 11925-2:2010. It is identical to ISO 11925-2:2010, incorporating corrigendum January 2011. It supersedes BS EN ISO 11925-2:2002, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committe
3、e FSH/21/1, Reaction to fire tests - European fire test methods including ignitabilty tests.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible
4、 for its correct application. BSI 2011 ISBN 978 0 580 60503 1 ICS 13.220.50 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2011. Amendments/corrigenda i
5、ssued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 11925-2 November 2010 ICS 13.220.50 English Version Reaction to fire tests - Ignitability of products subjected to direct impingement of flame - Part 2: Single-flame source test (ISO 11925-2:2010) Essai
6、s de raction au feu - Allumabilit de produits soumis lincidence directe de la flamme - Partie 2: Essai laide dune source flamme unique (ISO 11925-2:2010) Prfungen zum Brandverhalten - Entzndbarkeit von Produkten bei direkter Flammeneinwirkung - Teil 2: Einzel-Flammentest (ISO 11925-2:2010) This Euro
7、pean Standard was approved by CEN on 2 October 2010. 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 co
8、ncerning 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
9、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, Ir
10、eland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix
11、 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 11925-2:2010: EIncorporating corrigendum January 2011Supersedes EN ISO 11925-2:2002EN ISO 11925-2:2010 (E) 3 Foreword This document (EN ISO 11925-2:2010)
12、 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 te
13、xt or by endorsement, at the latest by May 2011, and conflicting national standards shall be withdrawn at the latest by May 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for
14、 identifying any or all such patent rights. This document supersedes EN ISO 11925-2:2002. 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, Cze
15、ch Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 11925-2:2
16、010 has been approved by CEN as a EN ISO 11925-2:2010 without any modification. BS EN ISO 11925-2:2010iiiEN ISO 11925-2:2010(E) Contents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Test apparatus .2 5 Test specimen4 5.1 Preparation.4 5.2 Dimensions 4
17、 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 operations5 7.3 Testing operations 6 7.4 Duration of test7 8 Expression of results7 9 Test report7 Annex A (informative) Precision of test meth
18、od23 Bibliography26 BS EN ISO 11925-2:2010iv EN ISO 11925-2:2010(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 technica
19、l 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 wit
20、h 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 Inter
21、national 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
22、 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 third edition cancels and replaces the second edition (ISO 11
23、925-2:2002), 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 Report1) Part 2: Single-flame source test Part 3: M
24、ulti-source test1)1) The main title of ISO 11925 has been changed since these parts were first published, originally referring to the ignitability of building products only. It is intended that these parts be aligned with the new main title at their next revision. BS EN ISO 11925-2:2010vEN ISO 11925
25、-2:2010(E) Introduction This fire test method has been developed to define reaction to the 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
26、. 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 th
27、e production of flaming droplets depends on whether or not the filter paper placed beneath the specimen ignites. BS EN ISO 11925-2:2010This page deliberately set blankINTERNATIONAL STANDARD EN ISO 11925-2:2010(E)1Reaction to fire tests Ignitability of products subjected to direct impingement of flam
28、e 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 haz
29、ards can 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 identified and provided. Written safety instructions should be issued. Appropriate training should be given to relev
30、ant 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 can produce severe flaming during the test. A hand water spray or an inert gas suppression
31、 system, e.g. compressed nitrogen, which can be directed to the burning area, should be available together with other means, such as fire extinguishers. In some cases, smouldering can be difficult to extinguish completely and immersion in water can be necessary. 1 Scope This part of ISO 11925 specif
32、ies 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
33、 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
34、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 BS EN ISO 11925-2:20102 EN ISO 11925-2:2010(E) 3 Terms and definitions For the purposes of this document, the terms a
35、nd definitions given in ISO 13943 and the following apply. 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; b) a planar exposed surface with a surface irregula
36、rity 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
37、, 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 d
38、uring the fire test procedure and igniting the filter paper beneath the specimen 3.4 sustained flaming persistence of flame for a period greater than 3 s 3.5 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
39、 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
40、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 po
41、ssible, 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 hoo
42、d “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 BS EN
43、ISO 11925-2:20103EN ISO 11925-2:2010(E) 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
44、 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 o
45、f 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 toge
46、ther 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 a
47、ttached 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 f
48、ill 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 sp
49、ecimen 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 specime
