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GB/T 8626-2007 English PDF (GBT8626-2007)
GB/T 8626-2007 English PDF (GBT8626-2007)
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GB/T 8626-2007: Test method of flammability for building materials
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standard is technically outdated.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;
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 double stainless steel U-shaped frame, 15 mm wide
and (5 ± 1) mm thick, with other dimensions as shown in Figure 3. The frame hangs
vertically from the support (see 4.6 and Figure 4) in such a way that the underside of
the specimen is exposed directly to the flame along its centre line and edges (see
Figures 5 to 7).
The two halves of the specimen holder are held together by screws or clamps to
prevent the specimen warping.
It is important that the technique of clamping used is capable of restraining the
specimen for the total duration of the test.
NOTE. Small pins of approximately 1 mm in length may be incorporated on the surface of the
frame to which the specimen is attached.
4.6 Support
A vertical stand to which the specimen holder is attached in such a way 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 respectively.
5 Test specimen
5.1 Preparation
The test specimen is cut from a sample which is representative of the product to be
tested using the templates specified in 4.8.
5.2 Dimensions
The dimensions of the test specimens shall be ( ) mm long by ( ) mm wide.
Specimens of normal thickness 60 mm or less shall be tested using their full thickness.
Specimens of normal 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 essentially flat, the specimens may be tested in the form as in
end use (e.g. pipe insulation). The product shall be supplied in its entirety or as
specimens of length of 250...
Get QUOTATION in 1-minute: Click GB/T 8626-2007
Historical versions: GB/T 8626-2007
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GB/T 8626-2007: Test method of flammability for building materials
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;
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 double stainless steel U-shaped frame, 15 mm wide
and (5 ± 1) mm thick, with other dimensions as shown in Figure 3. The frame hangs
vertically from the support (see 4.6 and Figure 4) in such a way that the underside of
the specimen is exposed directly to the flame along its centre line and edges (see
Figures 5 to 7).
The two halves of the specimen holder are held together by screws or clamps to
prevent the specimen warping.
It is important that the technique of clamping used is capable of restraining the
specimen for the total duration of the test.
NOTE. Small pins of approximately 1 mm in length may be incorporated on the surface of the
frame to which the specimen is attached.
4.6 Support
A vertical stand to which the specimen holder is attached in such a way 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 respectively.
5 Test specimen
5.1 Preparation
The test specimen is cut from a sample which is representative of the product to be
tested using the templates specified in 4.8.
5.2 Dimensions
The dimensions of the test specimens shall be ( ) mm long by ( ) mm wide.
Specimens of normal thickness 60 mm or less shall be tested using their full thickness.
Specimens of normal 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 essentially flat, the specimens may be tested in the form as in
end use (e.g. pipe insulation). The product shall be supplied in its entirety or as
specimens of length of 250...
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