GMW-3232-2007.pdf
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1、Test Method Materials GMW3232 Test Method for Determining the Flammability of Interior Trim Materials 1 Scope This test method shall be used to determine the hor- izontal burn rate of materials used in the passenger compartment of motor vehicles after exposure to a small flame. Note: Nothing in the
2、specification supersedes appli- cable laws and regulations. Note: In the event of a conflict between the Eng- lish and the domestic language, the English language shall take precedence. 1.1 Applicability.The method permits testing of materials and parts of the vehicle interior, individually or in co
3、mbination up to a thickness of 13 mm. It is normally only applicable to materials and parts within a 13 mm range to the passenger compartment air space. 1.1.1 Testing Frequency.All sources supplying parts or materials to this requirement must perform routine quality control testing to confirm compli
4、ance of each lot of material or parts produced. 1.1.2 Lot Identification. Each lot of material shall remain readilyavailable andidentifiable, untilthe tests are complete so it may be retrieved in the event of inspection and/or test failure.Each lot of material shall have a unique identification. 1.1
5、.3 Use of Incoming Material Test Data. When a source location can demonstrate that their process does not adversely affect flammability, the source location may use test data from each lot of incoming material. 2 References Note: Only the latest approved standards are appli- cable unless otherwise s
6、pecified. 2.1 External Standards/Specifications. FMVSS 302 2.2 GM Group Standards/Specifications. GM6090MGM9070P GMI 60261GMW3221 ISC-C93-001LTP.EM.129 STD 232 2.3 Additional References. Contran Resolution 675/86 3 Test Equipment 3.1 Facilities. 3.1.1 Test Cabinet.One configuration satisfying these
7、requirements is shown in Figure 3 to Figure 5 in Appendix A. The test cabinet consists of a rectangular steel cab- inet of approx.internal dimensions 381 mm long, 203 mm deep and 356 mm high. It shall have a heat resisting glass observation window, a closable open- ing to permit insertion of the tes
8、t specimen mounting fixture and a hole to accommodate tubing for a gas burner. A 13 mm clearance space around the top of the cabinet, ten 19 mm diameter holes in the base of the cabinet and legs to elevate the bottom of the cab- inet by 10 mm are to be provided for ventilation. 3.1.2 Apparatus for c
9、onditioning as required and to the appropriate requirements as described in GMW3221-Code A, unless otherwise specified in the relevant material specification. 3.1.3 Drying oven capable of maintaining the speci- fied temperature within the specified tolerances. 3.1.4 Chemical Fume Cupboard.Chemical f
10、ume cupboard suitable for mounting the test cabinet to avoid the penetration of combustion products to the laboratory during test.A natural venting hood is permissible provided adequate ventilation is assured. Any forced air ventilation shall be the minimum required for venting. 3.2 Equipment. 3.2.1
11、 Test Specimen Mounting Fixture. One con- figuration satisfying these requirements is shown in Figure 6 and Figure 7 in Appendix A: This shall consist of two matching U-shaped frames of metal (e.g.aluminum) stock 25 mm wide and 10 mm thick. The interior dimensions of the U-shaped frames shall be 51
12、mm wide by 330 mm long. Gauge Copyright 2007 General Motors Corporation All Rights Reserved Publication Department: North American Engineering Standards, Records and Documentation February 2007Page 1 of 14 PRD045 - VPRE ST 1 10/03 GMW3232GM WORLDWIDE ENGINEERING STANDARDS lines shall be marked (e.g.
13、by slots) on the upper frame 38 and 292 mm respectively from its open end. In order to support sub size test specimens and those that soften and bend during test, the lower frame shall have the means to accommodate thin heat resistance wires that span the width of the U-shaped frame at 25 mm interva
14、ls. (Grooves cut into the lower frame to accommodate 0.2 mm, e.g. nickel-chrome, ther- mowire are recommended). 3.2.2 Support Stand. One configuration satisfying these requirements is shown in Figure 8 in Appendix A: A metal stand to locate and support the test specimen mounting fixture (paragraph 3
15、.2.1) in the center of the cabinet during test, is required. 3.2.3 In order to detect when the flame front has pro- gressedto each of the gaugelines, it isrecommended to use lightweight cotton thread counterbalanced with approx. 14 g weights spanning the full width of the lower frame at the gauge li
16、nes (see Figure 6 in Appendix A). 3.2.4 A stopwatch calibrated to an accuracy of 0.5 s. 3.2.5 Bunsen burner with a tube of (10.0 0.5) mm inside diameter and provided with a gas adjusting valve to give a flame (38 1) mm high when the tube is vertical and the air inlet to the burner is closed. 3.2.6 G
17、as to provide a flame temperature equivalent to, or exceeding, that of natural gas. 3.2.7 Metal combwith seven to eightsmooth rounded teeth per 25 mm. 3.2.8 Cutting dies or shears for preparation of test specimens. 4 Test Material 4.1 Test Vehicle/Test Specimen. 4.1.1 Wherever possible, from the ava
18、ilable mate- rialorcomponent,rectangulartestspecimens (355 2) mm long and (100 2) mm wide, shall be taken. The thickness of the test specimens shall be that of the single or composite material used in the vehicle, except when the materials or composites thickness exceeds 13 mm. Then the test specime
19、ns shall be cut down to 13 mm, measured from the surface of the specimen closest to the passenger compartment air space. 4.1.2 Where it is not possible to obtain flat test spec- imens due to surface curvature, the test specimens shall be cut to not more than 13 mm in thickness at any point. As far a
20、s possible the test specimens shall be of uniform thickness. 4.1.3 Testing of Smaller Sized Samples. 4.1.3.1 General Requirements.The maximum available length or width of test specimens shall beusedwhereeitherdimensionislessthan (355 2) mm and (100 2) mm respectively. 4.1.3.2 Specific Japanese Legal
21、 Requirements. The minimum acceptable sample size shall be 25 mm in width and 293 mm in length. 4.1.3.3 SpecificBrazilianLegalRequirements (CONTRAN Resolution 675/86).The minimum acceptable sample size shall be 3 mm in width, but samples (3.60) mm wide shall be (355 2) mm long, and samples (60.100)
22、mm wide shall be at least 138 mm long. 4.1.4 Where sample sizes or shapes restrict the abil- ity to test, molded plaques of raw material shall be made 100 mm in width and 355 mm in length with a thickness no greater than the thinnest component cross section from the actual part for which the plaque
23、is being substituted. In sampling the test panels it shall be ensured that they are fully representative of the material or com- posite under test. 4.1.5 In the case of materials made of superimposed layers of different materials which are not composite materials, all the layers of the materials inc
24、luded within a depth of 13 mm from the surface facing towards the passenger compartment air space shall be tested individually. 4.1.6 Test specimens shall be cut from materials or composites both in production direction and perpen- dicular to this (e.g. warp and weft direction, longitu- dinal and tr
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