GMNA-GMP.TES.024-2004.pdf
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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.TES.024 Thermoplastic Elastomer - Styrene Block Copolymer, Shore A33 1 Scope This specification covers the properties of a black thermoplastic elastomer consisting of polypropylene and SEBS (sty- rene/ethylene/butadiene/styrene) rubber for i
2、nterior applications. 1.1 Typical Application. Typical applications include the following: pressure relief valve seal hinge / sealing strip. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 34 ISO 868 ISO 37 I
3、SO 1183 ISO 815 SAE J2236 2.2 GM Standards/Specifications. GMW3001 GMW3221 GMW3059 3 Requirements 3.1 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize the material are summarized in charts. The color shall be specified on drawings, in material specifi
4、cations and otherwise. 3.2 Requirements on Test Specimens. Tests shall be conducted using the latest issue of the test methods indicated. Suitable precautions should be taken to ensure that applicable safe limits are not exceeded when conducting test procedures, processes, and/or handling the materi
5、als required by this specification. Test specimens shall be die cut from fan gated injection molded plaques having a nominal thick- ness of 2.0 0.2 mm. Die cut specimens are to be tested with the long axis of the test specimen perpendicular to the direction of flow. Plaque dimensions must be suffici
6、ent to permit this. Tests shall be conducted 40 h minimum after molding and immediately following a condition- ing period of 24 h minimum per GMW3221, Code A, unless otherwise specified. All tests shall be performed on unannealed specimens. In addition, tests specified at temperatures be- low or abo
7、ve 22 3C shall be conducted at the specified temperature using specimens condi- tioned at the specified temperature for 4 h mini- mum. The minimum values specified in the property tables must be met by test specimens in natural, black or in a “standard” sampled color if natural or black are not avai
8、lable. For colored grades where other pigment and additive systems (e.g. stabilizer) are used, the impact values shall not decrease more than 10% from the specified minimum value. Copyright 2004 General Motors Corporation All Rights Reserved June 2004 Originating Department: North American Engineeri
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- GMNA GMP TES 024 2004
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