PDF GB/T 8626-2007 English (GB/T 8626-1988: Older version)
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Test method of flammability for building materials
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Test method of flammability for building materials
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GB/T 8626-2007: PDF in English (GBT 8626-2007) GB/T 8626-2007
GB
ICS 13.220.40
C 80
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
GB/T 8626-2007 / ISO 11925-2:2002
Replacing GB/T 8626-1988
Test method of flammability for building materials
(ISO 11925-2:2002 Reaction to fire tests –
Ignitability of building products subjected to direct impingement of flame –
Part 2: Single-flame source test, IDT)
ISSUED ON: DECEMBER 21, 2007
IMPLEMENTED ON: JUNE 01, 2008
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Test apparatus ... 7
5 Test specimen ... 10
6 Conditioning... 11
7 Test procedure ... 11
8 Expression of results ... 13
9 Test report ... 13
Annex A (Normative) Procedure for products which melt and shrink ... 25
Annex B (Informative) Precision of test method ... 30
Foreword
This Standard is equivalent to adopt ISO 11925-2:2002 “Reaction to fire tests -
Ignitability of building products subjected to direct impingement of flame - Part 2:
Single-flame source test” (English version).
This Standard is equivalent to translate ISO 11925-2:2002.
For ease of use, this Standard has the following editorial modification:
a) REVISE “this International Standard” INTO “this Standard”;
b) USE decimal point “.” To replace the comma “,” which is used as decimal point.
This Standard replaces GB/T 8626-1988 “Test method of flammability for building
materials”; because the research and development of a series of reaction to fire tests
by International Standardization Organization ISO/TC 92 SHOWS that the original
standard is technically outdated.
Compared with GB/T 8626-1988, the main differences of this Standard are as follows:
- REVISE the specimen dimension and quantity AS: specimen dimension (250 ×
90) mm; the thickness shall not exceed 60 mm; the specimen quantity is 6 pieces
(2.1 of 1988 edition);
- ADJUST the ignition duration TO 15 s or 30 s for clients’ choice, and INDICATE
the ignition duration in test report (3.7 of 1988 edition);
- SPECIFY the flame height to be (20 ± 1) mm (3.6 of 1988 edition);
- ADD the specifications of duration of test (see 7.4 of this edition);
- ADD the specifications of carrying out additional test for multilayer products
greater than 10 mm thick (see 7.3.3.2.3 and Figure 7 of this edition);
- DELETE the determination of material flammability (Chapter 4 of 1988 edition);
- ADD the expression of results (see Chapter 8 of this edition);
- ADD the test report (see Chapter 9 of this edition);
- ADD the normative annex “Procedure for products which melt and shrink” (see
Annex A of this edition);
- ADD the informative annex “Precision of test method” (see Annex B of this
edition).
Test method of flammability for building materials
1 Scope
This 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
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
EN 13238 Reaction to fire tests for building products - Conditioning procedures
and general rules for selection of substrates
EN ISO 13943 Fire safety - Vocabulary
3 Terms and definitions
For the purposes of this 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) planar exposed surface;
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 contacts 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 may be given in the relevant product standards.
7.3.3.1 Surface exposure
For all essentially flat products (see 3.2), the flame shall be applied on the centre line
of the specimen, 40 mm above the bottom edge (see Figure 9). Each different surface,
which may be exposed in practice, shall be tested (see 5.4.2).
7.3.3.2 Edge exposure
7.3.3.2.1 For essentially flat single layer or multilayer products less than or equal to 3
mm total thickness, the flame shall be applied to the mid point on the bottom of the test
specimen (see Figure 5).
7.3.3.2.2 For essentially flat single layer or multilayer products greater than 3 mm total
thickness, 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).
7.3.3.2.3 For all multilayer products greater than 10 mm thick, 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).
7.3.4 For products which are not essentially flat and which are to be tested in their end-
use form, the flame shall be applied as described 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.
NOTE: A modification to the apparatus and/or procedure may be necessary but many non-
planar products will normally only require a change in the specimen support frame. In some
instances, however, the burner mounting may also be inappropriate and the ignition source
may need to be held and applied manually.
The product may be free standing or may be held in its end-use orientation in a retaining frame
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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