Technical specification of flame retardant of non-metallic materials for railway vehicle
1 Scope
This standard specifies the terms and definitions, product classification, requirements and test methods of flame retardant of non-metallic materials for railway vehicle.
This standard is applicable to the inspection and manufacture of flame retardant properties of non-metallic materials for railway vehicle (including trailers and control cars of centralized power EMU).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2406.2 Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature test
GB/T 5454 Textiles - Burning behaviour - Oxygen index method
GB/T 8323.2 Plastic - Smoke generation - Part 2: Determination of smoke density by a single-chamber test
GB 8624-2012 Classification for burning behavior of building materials and products
GB/T 10707 Rubber - Determination of the burning behaviour
GB/T 17596-1998 Textiles - Commercial laundering procedure for textile fabrics prior to flammability testing
TB/T 1484
(all parts) Specification for cables on board rolling stock
ISO 19702 Guidance for sampling and analysis of toxic gases and vapours in fire effluents using Fourier Transform Infrared (FTIR) spectroscopy
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
exposed area
surface area of combustible material directly exposed to fire source
3.2
limited surfaces
relatively small surface of exposed area with a dimensional limit
3.3
strip
compared with the conventional surface, it has a certain length and a relatively small exposed area, which is different from the limited surfaces with relatively uniform dimensions in all directions
3.4
specific optical density of smoke
D, (n)
maximum specific optical density of smoke within n minutes, where n is the time elapsed from the beginning of the test
4 Product classification
4.1 Classification principles
For flame retardant properties of materials, the classification principles are as follows:
a) Intrinsic properties of the material;
b) Position of the material or component;
c) Shape and layout of the material;
d) Exposed area and relative mass of the material.
4.2 Product classification
The flame retardant requirements of different products are shown in Table 1 according to 4.1.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Product classification
5 Flame retardant requirements and test methods of non-metallic materials
Annex A (Normative) Method and result judgment of 45° angle burning test
Annex B (Normative) Test method for toxic gases
