Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
All the technical contents of this standard are mandatory.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China.
Flammability of interior materials for buses
1 Scope
This standard specifies the terms and definitions, technical requirements, test method, and requirements for implementation date for flammability of interior materials for buses.
This standard is applicable to the evaluation of flammability of interior materials for M2 and M3 buses.
This standard does not cover electrical parts (electrical modules such as air conditioner assembly control switch, wire harnesses, electrical control panel, navigator, radio receiver, DVD module, and driving combination instrument), lighting, air bags (curtains), bathroom accessories (toilet, hand wash basin, and water tank) and sandwich panels with metallic outer layer and non-metallic inner layer.
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 2406.2-2009 Plastics - Determination of burning behaviour by oxygen index - Part 2: Ambient-temperature test (ISO 4589-2: 1996, IDT)
GB 2918 Plastics - Standard atmospheres for conditioning and testing
GB/T 5454 Textiles - Burning behaviour - 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 behaviour using a radiant heat source
GB/T 20285 Toxic classification of fire effluents hazard for materials
GB/T 32086 Requirement of vertical flammability characteristic and test method for certain category automobile interior material
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
bus
a passenger vehicle accommodating more than 9 seats including the driver's seat
3.2
horizontal burning
fix the sample to a horizontal fixture with one end exposing to a specified test flame, and evaluate the horizontal burning behavior by measuring the burning rate
3.3
vertical burning
fix the sample to a vertical fixture with the lower end which exposing to a specified test flame, and evaluate the vertical burning behavior by measuring the burning rate
3.4
oxygen index
under the specified test conditions, during applying oxygen - nitrogen mixture at 23℃±2℃, the minimum oxygen concentration maintaining the material combustion, expressed by volume fraction
3.5
density of smoke
a measure of the smoke amount emitted by a material under specify test conditions, expressed by the attenuation of light intensity transmitted through the smoke
3.6
smoke toxicity
the degree of damage/ harm caused by toxic and hazardous substances in the smoke
[GB 8624-2012, definition 3.19]
3.7
interior materials for buses
single material or laminated composite materials used for interior parts of buses, includes interior trim panels, floorings, elastic cushion materials, textile materials, leather materials, plastic materials for seats, as well as thermal insulation, noise reduction, vibration-absorptive materials, connection materials and other interior non-metallic materials
4 Technical requirements
4.1 Material classification
Interior materials for buses shall be classified according to the materials applied, parts contained and service position, as shown in Table 1.
Table 1 Classification of interior materials
Category number Material applied Part contained and service position
1 Interior trim panel materials Air duct, interior trim panel of top cover, racks for luggage, side panel, rear panel, instrument panel and its components as well as bathroom housing, and door trim.
2 Flooring materials Main material for floor, floor cover, and luggage compartment cover
3 Elastic cushion materials Elastic cushion for seat cushion, seat backrest, and headrest
4 Textile materials Seat fabrics, curtains, sun shades and other decorative fabrics
5 Leather materials Leather for decoration or coating (excluding genuine leather)
6 Plastic materials for seat Rigid plastic seat
7 Thermal insulation, noise reduction, and vibration-absorptive materials Thermal insulation, noise reduction, vibration-absorptive and other parts for engine compartment and vehicle body
8 Connecting materials Telescopic tarpaulin used for car hinged connection
9 Other interior materials Guardrails, handrails, seat accessories (seat basins, support plates, etc.), window pillars, upper and lower window frames, decorative lampshades, safety belts, sealing strips, and other parts of the vehicle
4.2 Technical requirements
4.2.1 General requirements
Interior materials meeting the requirements of this standard shall be considered to meet the requirements in GB 8410.
4.2.2 Flammability of interior materials
The flammability of interior materials shall meet the requirements of Table 2.
Table 2 Flammability of interior materials
Category number Material applied Technical requirements
Horizontal burning / (mm/min) Vertical burning / (mm/min) Oxygen index/% Smoke density grade Combustion performance grade
1 Interior trim panel materials ≥ Grade B ≤100 - ≤75 -
2 Flooring materials Floor cover A-0 - ≥30 - Bi (B-s1,t0)
Main material for floor, and luggage compartment cover ≥ Grade B ≤100 ≥26 ≤75 -
3 Elastic cushion materials A-0 ≤100 - - -
4 Textile materials Suspension materials such as curtains and sun shades ≥ Grade B ≤100 ≥30 ≤75 -
Others ≥27 ≤75 -
5 Leather materials For seats ≥ Grade B ≤100 ≥27 ≤75 -
Others ≥ Grade B ≥25 ≤75 -
6 Plastic materials for seats ≥ Grade B ≤100 ≥26 -
7 Thermal insulation, noise reduction, and vibration-absorptive materials For engine compartment A-0 ≤100 ≥28 ≤75 -
For bus body ≥ Grade B ≥25 ≤75 —
8 Connecting materials ≥ Grade B ≤100 ≥26 ≤75
9 Other interior materials ≤D-50 - ≥24 -
Note: “-” indicates that the parts are not subject to this test.
4.2.3 Minimum dimension requirements for parts
The minimum dimensions of the parts to be tested are as follows:
a) part with width ≥ 100 mm and length ≥ 356 mm;
b) parts of the same material with width ≥ 100 mm, 138 mm ≤ length ﹤ 356 mm, and cumulative length ≥ 1 m used in the same part of the vehicle;
c) parts of the same material with 20 mm ≤ width ﹤ 100 mm, length ≥ 356 mm, and cumulative length ≥ 2 m used in the same position of the vehicle;
4.2.4 Other descriptions
4.2.4.1 The dimension of the part shall be measured according to the maximum rectangle covered by the maximum projection plane in any direction of the part.
4.2.4.2 If the dimension does not meet the requirements of 4.2.3, the part shall be not applicable to this standard.
4.2.4.3 If the dimensions of the part can meet the requirements of 4.2.3, but it contains cavity, and the cavity-free area does not meet the minimum dimension requirements, the part shall be not applicable to this standard.
4.2.4.4 For parts of the same manufacturing plant, same material, same process, same thickness but used for different positions, the part used for the position with the highest technical requirements may be inspected to represent other parts.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Test method
6 Implementation date
Annex A (Normative) Sampling requirements for test sample
