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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.TES.012 Thermoplastic Elastomer - Styrene Block Copolymer, Shore A89, 100 MPa Flexural Modulus, Interior, Integrally Colored 1 Scope This specification covers the properties of a natural, UV stabilized thermoplastic elastomer consisting of p
2、olypropylene and SEBS (styrene/ethylene/butylene/styrene) rubber for interior applications. 1.1 Typical Application. Typical applications include the following: molded-in-color airbag cover 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External
3、Standards/Specifications. ASTM D3763 ISO 1183 ISO 34-1 SAE J1545 ISO 37 SAE J1639 ISO 178 SAE J1885 ISO 812 SAE J 2236 ISO 868 2.2 GM Standards/Specifications. GM9305P GMW3059 GMW3001 GMW3221 3 Requirements 3.1 Requirements on Delivery. Important physical, mechanical and thermal properties that char
4、acterize the material are 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 ap
5、plicable safe limits are not exceeded when conducting test procedures, processes, and/or handling the materials required by this specification. Test specimen shall be die cut from fan gated injection molded plaques having a nominal thickness of 2.0 0.2 mm. Die cut specimens are to be tested with the
6、 long axis of the test specimen perpendicular to the direction of flow. Plaque dimensions must be sufficient to permit this. Tests shall be conducted 40 h minimum after molding and immediately following a conditioning period of 24 h per GMW3221 Code A, unless otherwise specified. All tests shall be
7、performed on unannealed specimens. In addition, tests specified at temperatures below or above 22 3C shall be 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 speci
8、mens 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 anymore than 10% from the specified minimum value. 3.3 Compound Properties. See Tables 1
9、 and 2. Copyright 2004 General Motors Corporation All Rights Reserved June 2004 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/
10、23/2008 23:30:57 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.TES.012 GM ENGINEERING STANDARDS Copyright 2004 General Motors Corporation All Rights Reserved Page 2 of 3 June 2004 Table 1: Compound Properties (Natural) Property Test Method Unit Value Shore A Hardness
11、ISO 868, 15 s delay Shore A 88 6 Specific Gravity ISO 1183 0.87 to 0.93 Tensile Stress at Break ISO 37, Type 1 dumbbell, 500 mm/minute MPa 7.4 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 4.4 min
12、 Tear Strength ISO 34-1, Method B, angle die, 500 mm/minute kN/m 53 min Flexural Modulus -30C +22C +70C ISO 178, 50 mm span, 2 mm/minute test speed, chord modulus using 0.5 to 2.5 mm strain MPa 815 max 65 130 20 min Properties After Heat Aging SAE J2236 1000 h at 135C in an air- circulating oven fol
13、lowed by indicated 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 % % 50% retention 50% retention Fogging Number GM9305P, Type B, 95C % 70 min Colorfas
14、tness to Light Xenon Arc per SAE J1885, 1240.8 kJ/m2 Change in Color Surface Defects E 3.0 No objectionable defects allowed Multiaxial Impact at +23C, Total Energy ASTM D3763, 6.6 m/s, Ref. SAE J1639 Joules 13 min. at max load Failures must be ductile Multiaxial Impact at -40C, Total Energy ASTM D37
15、63, 6.6 m/s, Ref. SAE J1639 Joules 10 min. at max load Failures must be ductile 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 23:30:57 MDTNo reproduction or networking permitted without licen
16、se from IHS -,-,- GM ENGINEERING STANDARDS GMP.TES.012 Copyright 2004 General Motors Corporation All Rights Reserved June 2004 Page 3 of 3 Table 2: Compound Properties (Integrally Colored) Property Test Method Unit Value Fogging Number GM9305P, Type B, 95 C % 70 min Colorfastness to Light Xenon Arc
17、per SAE J1885, 1240.8 kJ/m2 Change in Color Surface Defects E 3.0 No objectionable defects allowed Multiaxial Impact at -40C, Total Energy ASTM D3763, 6.6 m/s, Ref. SAE J1639 Joules 10 min. at max load Failures must be ductile Note 1: For integrally colored compounds, the color of each test specimen
18、 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 natural weathering, natural weathering takes precedent. 4 Manufacturing Process Not applicable. 5 Rule
19、s 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 with the requirements of GMW3059, Restricted and Reportable Substances for
20、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. as follows: GMP.TES.012 8 Release and Revisions 8.1 Release. This specificat
21、ion was originated by the 90A TPE Specialist Team in September 1998. 8.2 Revisions. Rev Date Description (Organization) A JUN 2003 ISO conversion; revised title (TPE Material Specialist) B JUN 2004 Revised Table 1 values (TPE Material Specialist) 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 23:30:57 MDTNo reproduction or networking permitted without license from IHS -,-,-