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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.TES.023 Thermoplastic Elastomer- Styrene Block Copolymer, Shore A35, Interior, Integrally Colored 1 Scope This specification covers the properties of a natu- ral, UV stabilized thermoplastic elastomer consist- ing of polypropylene and SEBS (
2、sty- rene/ethylene/butylene/styrene) rubber for interior applications. 1.1 Typical Application. Typical applications in- clude the following: gear shift boots, cup and tray liners, dampeners 2 References Note: Only the latest approved standards are ap- plicable unless otherwise specified. 2.1 Extern
3、al Standards/Specifications. ISO 34-1 ISO 1183 ISO 37 SAE J1545 ISO 812 SAE J1885 ISO 815 SAE J2236 ISO 868 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 a
4、re summarized 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 ar
5、e not exceeded 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 t
6、est specimen 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 perfo
7、rmed on unannealed 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 spec
8、imens in natural, 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
9、s 1 and 2. Copyright 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,
10、06/23/2008 23:31:14 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.TES.023 GM ENGINEERING STANDARDS Copyright 2003 General Motors Corporation All Rights Reserved Page 2 of 3 June 2003 Table 1: Compound Properties (Natural) Property Test Method Unit Value Shore A Hardne
11、ss ISO 868, 15 s delay Shore A 35 5 Specific Gravity ISO 1183 1.03 to 1.09 Tensile Stress at Break ISO 37, Type 1 dumbbell, 500 mm/minute MPa 4.4 min Elongation at Break ISO 37, Type 1 dumbbell, 500 mm/minute % 425 min Tensile Stress at 100% Elongation ISO 37, Type 1 dumbbell, 500 mm/minute MPa 0.55
12、 min Compression Set ISO 815, Type A, 22 h at 70C % 35 max Tear Strength ISO 34-1, Method B, angle die, 500 mm/minute kN/m 12 min Properties After Heat Ag- ing SAE J2236 1000 h at 125C in an air- circulating oven followed by indicated property testing at 23C. Test methods are the same as for origina
13、l mechanical property testing. Change in property No objectionable color change or tackiness. Tensile Strength Elongation at Break % % 80% retention 80% retention Fogging Number GM9305P, Type B, 95C % 70 min Colorfastness to Light Change in Color Surface Defects Xenon Arc per SAE J1885, 1240.8 kJ/m2
14、 (see Note 1) E 3.0 No objectionable defects allowed Table 2: Compound Properties (Integrally Colored) Propery Test Method Unit Value Fogging Number GM9305P, Type B, 85 C % 70 min Colorfastness to Light Change in Color Surface Defects Xenon Arc per SAE J1885, 1240.8 kJ/m2 (see Note 1) E 3.0 No objec
15、tionable defects allowed Note 1: For integrally colored compounds, the color of each test specimen shall be measured per SAE J1545, CIELAB color space, 10 degree observer, illuminant D65, specular included, sphere geometry, before and after exposures. In case of conflict between accelerated and natu
16、ral weathering, natural weathering takes precedent. 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 23:31:14 MDTNo reproduction or networking permitted without license from IHS -,-,- GM ENGINEE
17、RING STANDARDS GMP.TES.023 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 All materials supplied 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 wi
18、th the requirements of GMW3059, Re- stricted and Reportable Substances for Parts. 6 Approved Sources Approved sources 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. a
19、s follows: GMP.TES.023 8 Release and Revisions 8.1 Release. This specification was originated by the 90A TPE Specialist Team in January 2003 and first published in June 2003. 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 23:31:14 MDTNo reproduction or networking permitted without license from IHS -,-,-