GMNA-GMP.EEBC.001-2004.pdf
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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.EEBC.001 Thermoplastic Elastomer - Polyester, Shore D36, 45 MPa Flexural Modulus 1 Scope This specification covers the properties of a Shore D36, 45 MPa flexural modulus thermoplastic polyester elastomer, pellet form, injection molding and e
2、xtrusion compound. The polyester is a poly(ether ester) block copolymer. 1.1 Typical Application. Typical applications include the following: hoses, tubing, seals and jacketing for wire and cable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 Ex
3、ternal Standards/Specifications. ASTM D789 ISO 974 ISO 34-1 ISO 1133 ISO 178 ISO 1183 ISO 306 ISO 3146 ISO 527 ISO 14910-2 ISO 868 2.2 GM Standards/Specifications. GMW3001 GMW3059 3 Requirements 3.1 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize the
4、 material are summarized in charts. The color shall be specified on drawings, in material specifications and otherwise. Performance requirements, e.g. flammability, fogging or resistance to odor shall be specified on the part drawing, in the math data file, or in component specifications. 3.2 Requir
5、ements 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 materials required by this specificatio
6、n. Unless otherwise specified, preparation of test specimens and standard test methods shall be in accordance with ISO 14910-2. All test values herein are based on material with a moisture content of 0.1% maximum. Immediately after molding, specimens shall be sealed in a moisture-proof container/env
7、elope. Tests shall be conducted 40 h minimum after molding and immediately following a conditioning period of 24 h minimum at 22 3C and 50% RH unless otherwise specified. All tests shall be performed on unannealed specimens. In addition, tests specified at temperatures below or above 22 3C shall be
8、conducted at the specified temperature using specimens conditioned at the specified temperature for 4 h minimum. 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 available. For colored gra
9、des 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. 3.3 Compound Properties. See Table 1. Copyright 2004 General Motors Corporation All Rights Reserved Originating Department: North America Engi
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