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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.E/P.140 Thermoplastic Elastomer - Polyolefinic, Shore A55, Interior, Integrally Colored Copyright 2005 General Motors Corporation All Rights Reserved October 2005 Originating Department: North American Engineering Standards Page 1 of 3 1 Sco
2、pe This specification covers the properties of a natural, UV and heat stabilized, thermoplastic vulcanizate containing fully cured EPDM particles dispersed in a continuous polypropylene matrix. This material can be processed by injection molding, extrusion, or blow molding. 1.1 Typical Application.
3、Typical applications include the following: soft touch buttons, knobs, keypads, mats, seals and parts where softness, conformity, critical color match and appearance are required. Continuous operating temperature range: -40C to 100C. 2 References Note: Only the latest approved standards are applicab
4、le unless otherwise specified. 2.1 External Standards/Specifications. AATCC 23 ISO 868 ISO 34-1 ISO 1183 ISO 37 SAE J1545 ISO 105-G02 SAE J1885 ISO 812 SAE J2236 ISO 815 2.2 GM Standards/Specifications. GM1002M GMW3059 GM9305P GMW3221 GMW3001 3 Requirements 3.1 Requirements on Delivery. Important ph
5、ysical, mechanical and thermal properties that characterize 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. Su
6、itable 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 specification. Tests specimens shall be die cut from fan gated injection molded plaques having a nominal thickness of 2
7、.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 me sufficient to permit this. Tests shall be conducted 40 h minimum after molding and immediately following a conditioning period of 24 h minimum per G
8、MW3221, Code A unless otherwise specified. All tests shall be 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 val
9、ues 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 10% from
10、 the specified minimum value. 3.3 Compound Properties. See Table 1 and Table 2. 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 and GM1002M
11、, Standard Requirements - Plastics. 5.2 All materials supplied to this specification must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japa
12、n, IHS Not for Resale, 06/23/2008 23:22:43 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.E/P.140 GM ENGINEERING STANDARDS Copyright 2005 General Motors Corporation All Rights Reserved Page 2 of 3 October 2005 Table 1: Compound Properties (Natural) Property Test Method
13、 Unit Value Shore A Hardness ISO 868, 15 second delay. Shore A54 to 62 Specific Gravity ISO 1183 0.91 to 0.93 Tensile Stress at Break ISO 37, Type 1 dumbbell, 500 mm/minute MPa 2.4 min Elongation at Break ISO 37, Type 1 dumbbell, 500 mm/minute % 250 min Tensile Stress at 100% Elongation ISO 37, Type
14、 1 dumbbell, 500 mm/minute MPa 1.4 min Compression Set ISO 815, Type A, 22h at 70C % 40 max Tear Strength ISO 34-1, Method B, angle die, 500 mm/minutekN/m 10 min Low Temperature Brittleness ISO 812, Type B C -52 max Properties After Heat Aging SAE J2236, 1000 h at 100C in an air- circulating oven fo
15、llowed by indicated property testing at 23 C. 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 min 75 retention min Fogging Number GM9305P, Type B, 95C % 70 min C
16、olorfastness to Light Xenon Arc per SAE J1885, 1240.8 kJ/m2 Change in Color Surface Defects E 3.0 No objectionable defects allowed Table 2: Compound Properties (Integrally Colored) Property Test Method Unit Value Fogging Number GM9305P, Type B, 95C % 70 min. Colorfastness to Light Xenon Arc per SAE
17、J1885, 1240.8 kJ/m2 Change in Color Surface Defects E 3.0 No objectionable defects allowed Colorfastness to Burnt Gas (propane) AATCC 23 or ISO 105-G02, 168 h at 60C, specimen color: light gray or beige E = 1.5 max YI = 2.0 max For integrally colored compounds, the color of each test specimen shall
18、be measured per SAE J1545, CIELAB color space, 10 degree observer, illuminant D65, specular included, sphere geometry, before and after exposure. In case of conflict between accelerated weathering and natural weathering, natural weathering takes precedence. 6 Approved Sources Engineering qualificati
19、ons 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 qualified by engineering as meeting the requirements of this specification. Copyright General Motors North America Provided by IHS under
20、 license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:22:43 MDTNo reproduction or networking permitted without license from IHS -,-,- GM ENGINEERING STANDARDS GMP.E/P.140 Copyright 2005 General Motors Corporation All Rights Reserved October 2005 Page 3 of
21、3 7 Notes Not applicable. 8 Coding System This material specification shall be referenced in other documents, drawings, VTS, CTS, etc. as follows: Material per GMP.E/P.140 9 Release and Revisions 9.1 Release. This standard originated in October 2003. It was first approved by TPE Specialist in October 2005. It was first published in October 2005. 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 23:22:43 MDTNo reproduction or networking permitted without license from IHS -,-,-