National Standard of People s Republic of China

Transcription

1 Translated English of Chinese Standard: GB ICS T 09 National Standard of People s Republic of China GB GB Replacing GB Flammability of Automotive Interior Materials 汽车内饰材料的燃烧特性 Issued on: January 18, 2006 Implemented on: July 1, 2006 Jointly issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; The Standardization Administration Committee of the People's Republic of China. Page 1 of 15

2 Table of Contents Preface Scope Terms and definitions Technical requirements Test method Test report Page 2 of 15

3 Preface Chapter 3 and Chapter 4 of this Standard are mandatory; others are recommended. This standard corresponds to US Federation Automotive Vehicle Safety Standard FMVSS Flammability of Automotive Interior Materials. Its consistency with FMVSS Flammability of Automotive Interior Materials is non-equivalent. This standard replaces GB Flammability of Automotive Interior Materials. Compared with GB , the main changes of this standard are as follows: -- Automotive classification method in Chapter 1 is modified according to the requirements of GB ; -- According to the requirements of GB/T , modify the compiling method of terms and definitions in Chapter 2, and add English contents; -- Modify the definition of composite material; refer to Item 2.2; -- Improve the definition of interior material. Its definition scope is broadened; refer to Item 2.5; -- Technical requirements of Chapter 3 are modified; Item 3.1 and Item 3.3 in the previous standard s technical requirements are deleted; the relevant contents are included in Item 4.6; -- Requirements of heat source for test are modified; refer to Item 4.2.4; -- Add the test requirements when the flat test sample is not able to be obtained due to bent spare parts; refer to Item 4.3.2; -- Add the requirements - how to prepare test sample when the spare part s shape and dimension do not comply with the sampling requirements; refer to Item 4.3.2; -- Add the sampling requirements when the thickness of test sample is not uniform; refer to Item 4.3.2; -- Add the sampling example and graphic diagram; refer to Item 4.3.2; -- Modify the carding direction, before the test for surface fuzzing sample in test procedure; refer to Item 4.4.1; -- Add the test method when sample is slow-burning; refer to Item 4.4.9; -- Add content of result expression; refer to Item Page 3 of 15

4 This standard was proposed by National Development and Reform Commission. This standard shall be under centralized management of National Automotive Standardization Technical Committee. The standard was responsibly drafted by the Technical Center of China Faw Group Corporation; Main drafters of this standard: Wang Qing Guo, and Li Jing Hua. The previous versions replaced by this standard are: -- GB ; GB Page 4 of 15

5 Flammability of Automotive Interior Materials 1. Scope This standard defines the technical requirements and test methods of horizontal flammability of automotive interior material. This standard is applicable to the assessment of horizontal flammability of automotive interior material. Since there are many differences BETWEEN the actual conditions of various automotive interior materials (spare parts position, layout, use condition, ignition source, etc.) AND the test conditions stipulated in this standard, this standard is not applicable to the assessment of all the actual interior flammability of automotive interior materials. 2. Terms and definitions 2.1 burning rate According to this standard, the ratio between burning distance and the time used to burn such distance, in unit of mm/min. 2.2 composite material Surfaces of layers of similar or different materials that are tightly connected by different methods like heat sealing, splicing and welding to form a composite material. 2.3 exclusive material An overall even material that consists of the same kind of material. If different materials are intermittently connected together (like sewing, radio-frequency welding, riveting), the formed material shall not be regarded as composite material; each material shall be deemed as an exclusive material. 2.4 exposed side The spare parts shall be assembled towards the crew within the automobile. 2.5 interior materials The exclusive materials or composite materials used by automotive interior spare parts. They include: seating washer, seat backrest, seat-cover, seat belt, headrest, Page 5 of 15

6 Under this condition, the possible burning distance shall equal to the distance from the first marking line to the point where the flame goes out, or from the first marking line to the end of the sample. c) If width of the spare parts is between 3mm to 60mm and its length is less than 356mm; or width of the spare parts is above 60mm and its length is less than 138mm, this standard will not be applicable for test. Sample with a width of less than 3mm shall not be tested according to the standard, either Sampling Sample at least 5 pieces from the tested spare parts. For materials with different burning speed along the different distances, sampling shall be carried out at different distances; and five or more pieces of the samples shall be tested in the combustion box respectively. Sampling methods are as follows: a) When the material is supplied as whole width, sample shall be with full width and 500mm in length at least. Cut the materials at 100mm away the edge. Then sample evenly with equidistant spaces on the rest part. b) If shape and size of the spare parts conform to the sampling requirements, samples shall be cut off from the spare parts. c) If shape and size of the spare parts doesn t conform to the sampling requirements and this standard must be applied, it may use the same material and the same manufacturing process to prepare the standard sample with the same structure as the spare parts (356mm*100mm). The thickness shall be the minimum thickness of the spare parts, and shall not be larger than 13mm. Such test results cannot be used for identification and certification. Sample preparation details must be indicated in the test report. d) If thickness of the spare parts is larger than 13mm, mechanically cut off the samples from the non-exposed face to ensure that the sample thickness including the exposed surface equals to 13mm. e) In case of uneven thickness of the spare parts, mechanically cut off the samples from the non-exposed surface to ensure that the spare parts thickness is consistent with the minimum thickness. f) In case that uniform sample is not available due to bent spare parts, choose the parts as uniform as possible. And the arch-height of the sample shall not be larger than 13mm; otherwise, it must use the same material and the same manufacturing process to prepare the standard sample with the same structure as the spare parts (356mm*100mm). Thickness shall be the minimum thickness of the spare parts, and shall not be above 13mm. g) Test the composite material as the exclusive material, with the same sampling Page 12 of 15

7 4.4.5 Flame burns from the free end of the sample forward. Start to measure the time instantaneously when the root of propagating flame passes the first marking line. Pay attention to the propagating situation of the flame at the surface with faster burning rate. Timing shall be based on the surface with faster flame propagating speed When the flame arrives at the second marking line or it goes out before arriving at the second marking line, stop timing. Timing shall also be based on the surface with faster flame propagating speed. If the flame goes out before arriving at the second marking line, measure the burning distance from the first marking line to the point where the flame goes out. Burning distance refers to the length of the burned sample surface or burned interior of the sample If the non-exposed surface of the sample has been cut off, timing shall be based on the flame propagating speed at the exposed surface Requirements of the burning rate does not applicable to the surface formed by the cutting sample If the sample keeps slow combustion for a long time since the timing starts, stop testing when the timing reaches 20 min and record the burning time and burning distance In case of serial tests or repeated tests, the maximum temperature of the combustion box and testing support before next test shall not exceed 30 C. 4.5 Calculation Burning rate (V) shall be calculated by following formula: Where: V - burning rate, unit is mm/min; L - burning distance, unit is mm; V = 60* (L/T) T - time used for burning distance L, unit is s. Test result of burning speed shall be the maximum measured value of the burning speed of 5 or more samples. 4.6 Result expression If the sample is exposed to flame for 15s and still not burned; or the sample is burned, but the flame goes out before it arrives at the first marking line, there is no burning distance to measure. It shall be deemed as conformity to the requirements of burning rate. Result shall be recorded as A-0 mm/min. Page 14 of 15

8 4.6.2 If the flame goes out itself within 60s since timing starts, and the burning distance is less than 50mm, it shall be deemed as conformity to the requirements of burning rate. Result shall be recorded as A If the flame goes out between the 2 marking lines since timing starts, it shall be deemed as self-extinguishing sample and non-conformity to the requirements in Item 4.6.2; burning rate shall be calculated according to the requirements in Item 4.5; the result shall be recorded as C-actual value of burning rate (mm/min) If the flame arrives at the second marking line since timing starts or the situation mentioned in Item 4.49 happens (stop testing initiatively), burning rate shall be calculated according to the requirements in Item 4.5; the result shall be recorded as D-actual value of burning rate (mm/min) If the sample is burned within 15s after inflaming and the flame arrives at the first marking line, the sample shall be deemed as nonconformity to the requirements of burning rate, recorded as E. 5 Test report Test report shall include following contents: a) Material type, spare parts name, source, test date and tester; b) Sample color and number; c) Material composition; d) Sample size, thickness of respective layer of the composite material; the direction of the sample in the product; e) Sample quantity; f) Test result: Whether burning distance, burning time, burning rate and flammability conforms to the standard requirements; g) Whether supporting wire is used h) Record of test conditions that are different with the requirements in the standard. END Page 15 of 15