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GB/T 8627-2007 English PDF (GBT8627-2007)

GB/T 8627-2007 English PDF (GBT8627-2007)

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GB/T 8627-2007: Test method for density of smoke from the burning or decomposition of building materials

This Standard specifies the specific requirements for the test apparatus, test procedure, calculation of test results and test report for density of smoke from the density or decomposition of building materials.
GB/T 8627-2007
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 13.220.50
Q 10
Replacing GB/T 8627-1999
Test Method for Density of Smoke from the
Burning or Decomposition of Building Materials
ISSUED ON. DECEMBER 21, 2007
IMPLEMENTED ON. JUNE 1, 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
1 Application Scope ... 4
2 Normative References ... 4
3 Test Method ... 4
4 Test Apparatus ... 5
5 Test Specimen ... 7
6 Conditioning ... 7
7 Test Procedure ... 8
8 Special Procedure ... 9
9 Optional Procedure ... 9
10 Treatment of Data ... 9
11 Test Report ... 10
Appendix A (Informative) Cross Reference of the Article Numbers of this Standard and the Article Numbers of ASTM D2843-1999 ... 17
Appendix B (Informative) Technical Differences between This Standard and ASTM D2843-1999 and Their Reasons ... 19
Foreword
This Standard modifies and adopts ASTM D2843-1999, Standard Test Method for Density of Smoke from the Burning or Decomposition of Plastics (English edition). This Standard was redrafted in accordance with ASTM D2843-1999. The cross reference of the article numbers of this Standard and the article numbers of ASTM D2843-1999 is listed in Appendix A.
In consideration of the national conditions of China, some modifications are made in this Standard when it adopts ASTM D2843-1999; the list of these technical differences and their reasons are given in Appendix B.
This Standard replaces GB/T 8627-1999, Test Method for Density of Smoke from the Burning or Decomposition of Building Materials.
Compared with GB/T 8627-1999, the main technical changes of this Standard are as follows.
-- it specifies the steel wire mesh opening size in specimen holder is 6 mm while GB/T 8627-1999 only specifies the side length is 5 mm (see 2.1.5 of edition 1999); -- it deletes the note ?€?During a non-arbitration test, liquified petroleum gas can be used as the fuel gas for test?€? (2.2.1 of edition 1999);
-- it specifies the working pressure of propane is changed from 210 kPa to 276 kPa (see 4.3.1 of this edition); and
-- it adds special procedure for materials that drip and adds auxiliary burner and collector tray and so on. Meanwhile, it adds optional procedure (see Article 8 and Article 9).
Appendix A and Appendix B of this Standard are informative.
This Standard was proposed by the Ministry of Public Security of the PEOPLE Republic of China.
This Standard shall be under the jurisdiction of Subcommittee 7 of the National Technical Committee on Fire Protection (SAC/TC 113/SC 7).
The responsible drafting organization of this Standard. Sichuan Fire Research Institute of Ministry of Public Security.
The main drafters of this Standard. Zhao Chenggang, Liu Songlin, Zeng Xubin, Yao Jianjun and Yu Yingfei.
The editions of the standard replaced by this Standard are as follows.
-- GB/T 8627-1988 and GB/T 8627-1999.
Test Method for Density of Smoke from the
Burning or Decomposition of Building Materials
1 Application Scope
This Standard specifies the specific requirements for the test apparatus, test procedure, calculation of test results and test report for density of smoke from the density or decomposition of building materials.
This Standard specifies the test method for the measurement of volume of smoke produced under controlled conditions of combustion or decomposition. The measurements with this test method are made in terms of the loss of light transmission through a collected volume of smoke produced under controlled, standardized conditions. The apparatus is constructed so that the flame and smoke is observable during the test.
This standard is used to measure and describe the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions.
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.
GB/T 2918-1998, Plastics ?€? Standard Atmospheres for Conditioning and Testing ( idt. ISO 291.1997)
3 Test Method
3.1 It is intended to determine the possible smoke release of building materials under controlled conditions of combustion and decomposition. The principle is to evaluate the smoke density by measuring the loss of light transmission through a solid dust of smoke produced under conditions of combustion and decomposition of materials. 3.2 The test specimen is exposed to flame for the duration of the test, and the smoke shall focus a spot of light on the photocell in the right instrument panel. 4.4.3 Another box containing the photometer shall be attached to the right side of the chamber. The barrier-layer photoelectric cell shall have standard observer spectral response. An egg-crate grid in front of the photocell shall be used to protect the cell from stray light. The grid shall be finished in dull black and have openings at least twice as deep as they are wide. The current produced by the photocell is indicated in terms of percent light absorption on a meter. The photocell linearity decreases as the temperature increases; compensations shall therefore be made. The photocell shall not be operated at temperatures exceeding 50??C.
4.4.4 The meter shall have two ranges. The range change shall be accomplished by shunting the meter to one tenth of its sensitivity. When smoke accumulates to absorb 90 percent of the light beam, the meter shall be set to its basic sensitivity, by any appropriate manner. By doing this, the scale in the meter will then read from 90 to 100 % absorption instead of reading from 0 to 100 % absorption.
4.5 Timing Device
A timing device shall be used to indicate 15-s intervals. The timing device shall start measuring when the burner is swung into test position.
4.6 Planimeter
A planimeter or other suitable means shall be used for measuring the area under the light-absorption curve.
5 Test Specimen
5.1 The standard specimen shall be 25.4 ?? 0.3 by 25.4 ?? 0.3 by 6.2 ?? 0.3 mm. Other thicknesses can also be used; however, their thickness shall be stated in the report together with smoke density. Material thinner than 6.2 mm shall be tested by stacking and forming a composite specimen 6.2 mm thick. Material thicker than 6.2 mm shall be tested by machining the material down to a thickness of 6.2 mm. The maximum thickness of specimen is 25mm; when the thickness of material is greater than 25 mm, decide the fire exposure face in accordance with actual application conditions and reserve the fire exposure face during cutting.
5.2 The test sample shall consist of three specimens. The specimens shall be sanded, machined, or die cut in a manner that produces a cut surface that is free from projecting fibers, chips, and ridges.
6 Conditioning
6.1 Conditioning ?€? Condition the test specimens for not less than 40 h prior to test in accordance with the ambient conditions specified in GB/T 2918-1998.
During calibration, the mean value the three differences between the indicating value of light quantity and the calibrated value of standard filters shall be less than 3% (absolute value).
8 Special Procedure
8.1 For materials that drip, a second or auxiliary burner (with separate propane gas supply) shall be introduced into the chamber. See Figure 5 and auxiliary burner parts list.
8.2 Use a stainless steel collector tray to replace calcium-silicate sheet (1B in Figure 1) collector tray. The collector tray is tapered and collects drippings at the bottom (see 11 in Figure 5).
8.3 The auxiliary burner shall be ignited at the same time the standard burner is ignited. The auxiliary burner shall be operated at 138 kPa and it shall be positioned in such a manner that its flame is directed at the center of the collector tray. 9 Optional Procedure
9.1 Data acquisition hardware or a potentiometric recorder can be employed to record the output of the photocell versus time.
9.2 With a suitably sensitive meter, more than one decade chan...

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