GB/T 28752-2012 in English

《GB/T 28752-2012火焰在垂直表面的横向蔓延试验方法》由TC113（全国消防标准化技术委员会）归口，主管部门为应急管理部。

Test method for lateral spread of flame on building and transport products in vertical configuration

CAUTION: So that suitable precautions can be taken to safeguard health, the attention of all concerned in fire tests is drawn to the possibility that toxic or harmful gases can be evolved during exposure of test specimens. The advice on safety given in Annex C shall also be noted.

1 Scope

This standard specifies a method of test for measuring the lateral spread of flame along the surface of a specimen of a product orientated in the vertical position. It is applicable to assessing the performance of essentially flat materials, composites or assemblies that are used primarily as the exposed surfaces of walls in buildings and transport vehicles, such as ships and trains. Some profiled products (such as pipes, see Annex D) can also be tested under specified mounting and fixing conditions.

This standard is applicable to the measurement and description of the properties of materials, products or assemblies in response to radiative heat in the presence of a pilot flame under controlled laboratory conditions. It is not suitable to be used alone to describe or appraise the fire hazard or fire risk of materials, products or assemblies under actual fire conditions.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 14107 Fundamental terminology of fire protection - Part 2

3 Terms and definitions

For the purposes of this standard, the following terms and definitions and those given in GB/T 14107 apply.

3.1
assembly
fabrication of materials, products and/or composites

Example: Sandwich panels.

Note: The assembly may include an air gap.

3.2
average heat for sustained burning
average of the values of heat for sustained burning, measured at a number of specified positions

Note The average heat for sustained burning is expressed in megajoules per square metre (MJ/m2).

3.3
backing board
non-combustible board with the same width and length as the test specimen and (12.5 ± 3) mm thick, used in every test to back the specimen

Note 1: See 9.6.

Note 2: A non-combustible board is one that, when tested to ISO 1716, yields a gross calorific potential (PCS) of ≤ 2.0 MJ/kg.

3.4
composite
combination of materials that are generally recognized in building construction as discrete entities

Example: Coated or laminated materials.

3.5
critical heat flux at extinguishments
CFE
incident heat flux at the surface of a specimen at the point along its horizontal centreline where the flame ceases to advance and may subsequently go out

Note 1: The CFE value reported is based on interpolations of measurements with a non-combustible calibration board.

Note 2: The critical heat flux at extinguishment is expressed in kilowatts per square metre (kW/m2).

3.6
exposed surface
that surface of the specimen subjected to the heating conditions of the test

Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Surface characteristics of products for testing
6 Test specimens
7 Test apparatus
8 Test Environment
9 Additional equipment and instrumentation
10 Setting-up and calibration procedure
11 Test procedures
12 Expression of fire performance of specimen
13 Test report
Annex A (Informative) Comparison between clause numbers in this standard and those in ISO 5658-2:2006
Annex B (Informative) Technical differences between this standard and ISO 5658-2:2006 and their causes
Annex C (Normative) Safety precautions
Annex D (Normative) Test method for flame spread of plastic piping
Annex E (Informative) Specimen construction
Annex F (Informative) Calibration of the working heat-flux meter
Annex G (Informative) Guidelines for reporting and follow-up of results of fire test procedures
Annex H (Informative) Variability of test results
Bibliography