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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.TES.008 Thermoplastic Elastomer - Styrene Block Copolymer, Shore A87, 100 MPa Flexural Modulus, Interior, Paintable 1 Scope This specification covers the properties of a black, non-UV stabilized thermoplastic elastomer con- sisting of polypr
2、opylene and SEBS (sty- rene/ethylene/butylene/styrene) rubber for interior applications. 1.1 Typical Application. Typical applications in- clude the following: painted airbag cover 2 References Note: Only the latest approved standards are ap- plicable unless otherwise specified. 2.1 External Standar
3、ds/Specification. ASTM D3763 ISO 868 ISO 34-1 ISO 1183 ISO 37 SAE J1639 ISO 178 SAE J2236 ISO 812 2.2 GM Standards/Specifications GM9305P GMW3059 GMW3001 3 Requirements 3.1 Requirements on Delivery. Important physi- cal, mechanical and thermal properties that char- acterize the material are summariz
4、ed in charts.The color shall be specified on drawings, in material specifications 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 excee
5、ded when conducting test procedures, proc- esses, and/or handling the materials required by this specification. Test specimen shall be die cut from fan gated in- jection molded plaques having a nominal thickness of 2.0 0.2 mm. Die cut specimens are to be tested with the long axis of the test specime
6、n per- pendicular to the direction of flow. Plaque dimen- sions must be sufficient to permit this. Tests shall be conducted 40 h minimum after molding and immediately following a conditioning period of 24 h minimum at 22 3C and 50 6% RH unless otherwise specified. All tests shall be performed on una
7、nnealed specimens. In addition, tests specified at temperatures below or above 22 3C shall be conducted at the specified tem- perature using specimens conditioned at the speci- fied temperature for 4 h minimum. The minimum values specified in the property ta- bles must be met by test specimens in na
8、tural, black or in a standard sampled color if natural or black are not available. For colored grades where pigment and additive systems (e.g. stabilizer) are used, the impact values shall not decrease any- more than 10% from the specified minimum value. 3.3 Compound Properties. See Table 1. Copyrig
9、ht 2003 General Motors Corporation All Rights Reserved June 2003 Originating Department: North American Engineering Standards Page 1 of 3 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:30:5
10、0 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.TES.008 GM ENGINEERING STANDARDS Copyright 2003 General Motors Corporation All Rights Reserved Page 2 of 3 June 2003 Table 1: Compound Properties (Black) Property Test Method Unit Value Shore A Hardness ISO 868, 15 s del
11、ay Shore A 87 5 Specific Gravity ISO 1183 0.98 to 1.03 Tensile Stress at Break ISO 37, Type 1 dumbbell, 500 mm/minute MPa 9.6 min Elongation at Break ISO 37, Type 1 dumbbell, 500 mm/minute % 400 min Tensile Stress at 100% Elongation ISO 37, Type 1 dumbbell, 500 mm/minute MPa 3.0 min Tear Strength IS
12、O 34-1, Method B, angle die, 500 mm/minute kN/m 45 min Flexural Modulus -30C +22C +70C ISO 178, 50 mm span, 10 mm/minute test speed, chord modulus using 0.5 to 2.5 mm strain MPa 630 max 70 125 29 min Properties After Heat Ag- ing SAE J2236 1000 h at 135C in an air- circulating oven followed by indic
13、ated property testing at 23C. Test methods are the same as for original mechanical property testing. Change in property No objectionable color change or tackiness. Tensile Strength Elongation at Break % % 90% retention 90% retention Fogging Number GM9305P, Type B, 95C % 70 min Multiaxial Impact at +
14、23C, Total Energy ASTM D3763, 6.6 m/s, Ref. SAE J1639 Joules 8.3 min. at max load Failures must be ductile Multiaxial Impact at -40C, Total Energy ASTM D3763, 6.6 m/s, Ref. SAE J1639 Joules 11 min. at max load Failures must be ductile Copyright General Motors North America Provided by IHS under lice
15、nse with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:30:50 MDTNo reproduction or networking permitted without license from IHS -,-,- GM ENGINEERING STANDARDS GMP.TES.008 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 All materials supplied
16、 to this specification must comply with the requirements of GMW3001, Rules and Regulations for Material Specifications. 5.2 All materials supplied to this specification must comply with the requirements of GMW3059, Re- stricted and Reportable Substances for Parts. 6 Approved Sources Approved sources
17、 to this specification shall be listed in the GM MATSPC computer system. 7 Coding System This material specification shall be referenced in other documents, drawings, VTS, CTS, etc. as follows: GMP.TES.008 8 Release and Revisions 8.1 Release. This specification was first approved and released in Jun
18、e 2000 from a 1992 preprint. 8.2 Revisions. Rev Date Description (Organization) A JUN 2003 ISO conversion; revised title (TPE Material Specialist) Copyright 2003 General Motors Corporation All Rights Reserved Page 3 of 3 June 2003 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:30:50 MDTNo reproduction or networking permitted without license from IHS -,-,-