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GB 38262-2019: Flammability of interior materials for buses
GB 38262-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.40
T 09
Flammability of Interior Materials for Buses
ISSUED ON: OCTOBER 14, 2019
IMPLEMENTED ON: JULY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 5 
4 Technical Requirements ... 6 
5 Test Methods ... 8 
6 Implementation Date ... 9 
Appendix A (Normative) Sampling Requirements for Test Samples ... 10 
Flammability of Interior Materials for Buses
1 Scope
This Standard stipulates the terms and definitions, technical requirements, test
methods and the requirements of implementation date of flammability of interior
materials for buses.
This Standard is applicable to the assessment of flammability of interior materials for
Type-M2 and Type-M3 buses.
This Standard does not include electrical devices (various electric appliance modules,
such as air conditioning assembly control switch, wiring harness, electric appliance
control panel, navigator, radio, DVD module and driving combination meter), lamps,
airbags (curtains), bathroom accessories (such as toilet, washbasin and water tank)
and laminboard whose external layer is metallic material and internal layer is non-
metallic material.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 2406.2-2009 Plastics - Determination of Burning Behavior by Oxygen Index -
Part 2: Ambient-temperature Test (ISO 4589-2:1996, IDT);
GB/T 2918 Plastics - Standard Atmospheres for Conditioning and Testing;
GB/T 5454 Textiles - Burning Behavior - Oxygen Index Method (GB/T 5454-1997, neq
ISO 4589:1984);
GB 8410 Flammability of Automotive Interior Materials;
GB 8624-2012 Classification for Burning Behavior of Building Materials and Products;
GB/T 8627 Test Method for Density of Smoke from the Burning or Decomposition of
Building Materials;
GB/T 10707 Rubber - Determination of the Burning;
GB/T 11785 Reaction to Fire Tests for Floorings - Determination of the Burning
Behavior Using a Radiant Heat Source;
b) Width ≥ 100 mm, 138 mm ≤ length < 356 mm; same material component whose
accumulative used length in the same interior part is ≥ 1 m;
c) 20 mm ≤ width < 100 mm, length ≥ 356 mm; same material component whose
accumulative used length in the same interior part is ≥ 2 m.
4.2.4 Other instructions
4.2.4.1 Component dimensions shall be measured in accordance with the maximum
rectangle covered by the maximum projective plane of the component in any direction.
4.2.4.2 If component dimensions cannot satisfy the requirements in 4.2.3, then, this
component is not applicable to this Standard.
4.2.4.3 If component dimensions can satisfy the requirements in 4.2.3, but there are
cavities, and the parts without cavities cannot satisfy the requirements of minimum
dimensions, then, this component is also not applicable to this Standard.
4.2.4.4 In terms of components manufactured by the same manufacturer, with the
same materials, the same process and the same thickness, but are used in different
parts, components with the highest technical requirements may be tested to cover
components of other parts.
5 Test Methods
5.1 Conditioning
Before tests, samples shall be placed for over 24 h in accordance with the stipulations
in GB/T 2918, and under the conditions of standard ambient temperature (23 ± 2) °C,
relative humidity (50 ± 5) %.
5.2 Sampling Requirements
Please refer to Appendix A for sampling requirements.
5.3 Horizontal Burning
Conduct the test in accordance with the stipulations in GB 8410.
5.4 Vertical Burning
Conduct the test in accordance with the stipulations in GB/T 32086.
5.5 Oxygen Index
5.5.1 Textile materials shall be tested in accordance with the stipulations in GB/T 5454.
5.5.2 Rubber materials shall be tested in accordance with the stipulations in GB/T
Appendix A
(Normative)
Sampling Requirements for Test Samples
A.1 Preparation of test samples
Avoid cavities, directly cut test samples from components. If the components cannot
be cut into sample strips stipulated in this Standard, then, raw materials of the
components may be adopted to make sample strips that comply with the stipulations
in accordance with the same production process of the components.
If the components are made of multiple materials, they shall be decomposed into single
materials or laminated composite materials. In accordance with the requirements of
the single materials and laminated composite materials, respectively prepare samples.
The preparation of test samples may take the recommended dimensional
requirements in Table A.1 as a reference.
After components are decomposed into single materials and laminated composite
materials, in accordance with the technical requirements of the category that the
components belong to, determine the test results.
Example: for example, door guard which has the structure: PVC leather cladded substrate;
after decomposition, PVC leather and substrate shall respectively be tested in
accordance with the requirements of Class-1 “interior panels”; the test results
shall be determined in accordance with the technical requirements of “interior
panels”.
A.2 Requirements of thickness
When components’ actual thickness is less than the standard thickness recommended
in Table A.1, the thickness of test sample shall be the actual thickness of the
components. When components’ actual thickness is more than the standard thickness
recommended in Table A.1, the mode of cutting may be adopted to make sample strips
with the standard thickness. In terms of components, on which, the mode of cutting
cannot be adopted, the components may be made into sample strips that comply with
the post-cutting status. No matter which mode is adopted, it needs to be indicated in
the report.
When the density of smoke is tested, component thickness shall comply with the
stipulations in GB/T 8627.