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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.TES.004 Thermoplastic Elastomer - Styrene Block Copolymer, Shore A73, Interior, UV Stabilized, Integrally Colored 1 Scope This specification covers the properties of a natural or integrally colored, UV stabilized ther- moplastic elastomer co
2、nsisting of polypropylene and SEBS (styrene/ethylene/butylene/styrene) rubber for interior applications. 1.1 Typical Application. Typical applications include the following: lever knobs, buttons and other soft touch applications. Continuous operat- ing temperature range: -40 to 135 C. 2 References N
3、ote: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 34-1 ISO 868 ISO 37 ISO 1183 ISO 812 SAE J1885 ISO 815 SAE J2236 2.2 GM Standards/Specifications. GM9305P GMW3059 GMW3001 GMW3221 3 Requirements 3.1 Requirements on Delivery.
4、 Important physical, mechanical and thermal properties that characterize the material are summarized in charts. The color shall be specified on drawings, in material specifications and otherwise. Requirements on Test Specimens Tests shall be conducted using the latest issue of the test methods indic
5、ated. Suitable precauti- ons 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 specification. Test specimens shall be die cut from fan gated injection molded plaques having a nominal thick
6、- 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 sufficient to permit this. Tests shall be conducted 40 h minimum after molding and immediately following a condition- ing period of 24 h
7、per GMW3221 Code A, unless otherwise specified. All tests shall be performed on unannealed specimens. In addi- tion, tests specified at temperatures below or above 22 3C shall be conducted at the speci- fied temperature using specimens conditioned at the specified temperature for 4 h minimum. The mi
8、nimum 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 grades where other pigment and additive systems (e.g. stabilizer) are used, the impact values shall not decrease more than
9、10% from the specified minimum value. 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=
10、Japan, IHS Not for Resale, 06/23/2008 23:30:36 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.TES.004 GM ENGINEERING STANDARDS Copyright 2004 General Motors Corporation All Rights Reserved Page 2 of 3 June 2004 3.1.1 Mechanical Requirements. See Table 1. Table 1: Mecha
11、nical Requirements Mechanical Properties Test Methods Unit Values Hardness - Shore A ISO 868, 15 s delay Shore A 73 7 Tensile Stress at break ISO 37, Type 1 dumbbell, 500 mm/minute MPa 6.9 min Elongation at Break ISO 37, Type 1 dumbbell, 500 mm/minute % 460 min Tensile Stress at 100 % Elongation ISO
12、 37, Type 1 dumbbell, 500 mm/minute MPa 1.3 min Compression Set ISO 815, Type A, 22 h at 70 C % 82 max Tear Strength ISO 34-1, Method B, angle die, 500 mm/minutekN/m 30 min Low Temperature Brittleness ISO 812, Type B C - 57 max Properties After Heat Aging Tensile Strength Elongation at Break SAE J22
13、36, 1000 h at 100 C in an air- circulating oven followed by indicated property testing at 23 C. Test methods are the same as for original mechanical property testing. Change in prop- erty % % No objectionable color change or tackiness. 80 retention min 80 retention min 3.1.2 Physical Requirements. S
14、ee Table 2. Table 2: Physical Requirements Physical Properties Test Methods Unit Values Specific Gravity ISO 1183 0.90 - 0.93 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 E 3.0 No objectionable de- fects al
15、lowed 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 23:30:36 MDTNo reproduction or networking permitted without license from IHS -,-,- GM ENGINEERING STANDARDS GMP.TES.004 Copyright 2004Gener
16、al Motors Corporation All Rights Reserved June 2004 Page 3 of 3 3.1.3 Additional Requirements. See Table 3. Table 3: Additional Performance Properties (Integrally Colored) Additional Performance Properties Test Methods Unit Value Fogging Number GM9305P, Type B, 85 C % 70 min Colorfastness to Light C
17、hange in Color Surface Defects Xenon Arc per SAE J1885, 1240.8 kJ/m2 E 3.0 No objectionable de- fects allowed Note 1: For integrally colored compounds, the color of each test specimen shall be measured per SAE J1545, CIELAB color space, 10 observer, illuminant D65, specular included, spherical geome
18、try, before and after exposures. In case of conflict between accelerated and natural weathering, natural weathering takes precedence. 3.2 Performance Requirements. Performance Requirements e.g., flammability, fogging or re- sistance to odor shall be specified on part draw- ings or in component speci
19、fications. 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 Mate- rial Specifications. 5.2 All materials supplied to this specification must comply with the require
20、ments of GMW3059, Restricted and Reportable Sub- stances for Parts. 6 Approved Sources Engineering qualification of an approved source is required for this specification. Only sources listed in the GM Materials File (i.e., MATSPC) under this specification number have been quali- fied by engineering
21、as meeting the requirements of this specification. 7 Coding System This material specification shall be referenced in other documents, drawings, VTS, CTS, etc. as follows: GMP.TES.004 8 Release and Revisions 8.1 Release. This standard was originated by the Plastics Committee in June 1994. 8.2 Revisi
22、ons. Rev Approval Date Description (Organization) B JUN 2002 ISO Conversion (TPE Materi- als Specialist) C JUN 2004 Editorial (TPE Materials Spe- cialist) 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 23:30:36 MDTNo reproduction or networking permitted without license from IHS -,-,-