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1、 CG ENGINEERING STANDARDS Material Specification Plastics GMP.E/P.137 Thermoplastic Elastomer - Polyolefinic, Shore A47, Interior/Exterior and Underhood Applications, High Flow 1 Scope This specification covers the properties of a black, high flow, UV and heat stabilized, thermoplastic vulcanizate c
2、ontaining fully cured EPDM elastomer particles dispersed in a continuous polypropylene matrix. This material can be processed by injection molding or extrusion. 1.1 Typical Application. Typical applications include the following: air cleaner seal. Continuous operating temperature range: -40C - 135C.
3、 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 34-1 ISO 1431-1 ISO 37 ISO 1817 ISO 188 SAE J1885 ISO 812 SAE J1960 ISO 815 SAE J1976 ISO 868 SAE J2236 ISO 1183 2.2 GM Standards/Specifications. GM9305P GMW30
4、59 GMW3001 GMW3221 3 Requirements 3.1 Requirements on Delivery. 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. 3.2 Requirements On Test Specimens. Tests
5、 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 exceeded when conducting test procedures, processes, and/or handling the materials required by this specification. Tests specimens shall be die
6、 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 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 m
7、olding and immediately following a conditioning period of 24 h minimum per GMW3221 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 specime
8、ns conditioned at the specified temperature for 4 h minimum. The minimum 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. st
9、abilizer) are used, the impact values shall not decrease more than 10% from the specified minimum value. Copyright 2004 General Motors Corporation All Rights Reserved October 2004 Originating Department: North American Engineering Standards Page 1 of 3 Copyright General Motors North America Provided
10、 by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:22:32 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.E/P.137 GM ENGINEERING STANDARDS Copyright 2004 General Motors Corporation All Rights Reserved Page 2 of
11、3 October 2004 3.3 Compound Properties. See table 1. Table 1: Compound Properties (Black) Property Test Method Unit Value Shore A Hardness ISO 868, 15 second delay. Shore A43 to 51 Specific Gravity ISO 1183 0.92 to 0.97 Tensile Stress at Break ISO 37, Type 1 dumbbell, 500 mm/minute MPa 2.8 min Elong
12、ation at Break ISO 37, Type 1 dumbbell, 500 mm/minute % 265 min Tensile Stress at 100% Elongation ISO 37, Type 1 dumbbell, 500 mm/minute MPa 0.8 min Compression Set ISO 815, Type A, 70h at 125C % 55 max Tear Strength ISO 34-1, Method B, angle die, 500 mm/minutekN/m 11 min Low Temperature Brittleness
13、 ISO 812, Type B C -56 max Properties After Heat Aging SAE J2236, 1000 h at 120C 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 Property No objectionable color change or tackiness Tensile St
14、rength Elongation at Break % % 70 retention min 70 retention min Heat Aging ISO 188, 168 hours at 150C in an air- circulating oven followed by the indicated property testing at 23C. Test methods are the same as for original mechanical property testing. Change in property Tensile Strength Elongation
15、at Break Tensile Stress 100% Elongation % % % -25 max -30 max +20 max Properties After Fluid Aging ISO 1817, Immersion in IRM 903, 70 hours at 125C followed by the indicated property testing at 23C. Test methods are the same as for original mechanical property testing. Change in property Tensile Str
16、ength Elongation at Yield Tensile Strength 100% Elongation Volume Change % % % % -65 max -75 max -35 max +120 max Ozone Resistance ISO 1431-1, Procedure A, 100 pphm, 40 C Zero Rating Fogging Number GM9305P, Type B, 95C % 70 min Copyright General Motors North America Provided by IHS under license wit
17、h GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:22:32 MDTNo reproduction or networking permitted without license from IHS -,-,- GM ENGINEERING STANDARDS GMP.E/P.137 Copyright 2004 General Motors Corporation All Rights Reserved Page 3 of 3 October 2004 Table 1: C
18、ompound Properties (Black) (contd) Property Test Method Unit Value Colorfastness to Light Xenon Arc per SAE J1885, 1240.8 kJ/m2 Change in Color Surface Defects E 3.0 No objectionable defects allowed Accelerated Weathering Xenon Arc per SAE J1960, 2500 kJ/m2 Change in Color Surface Defects E 3.0 No o
19、bjectionable defects allowed Solar Weathering 2 years exposure to Natural weathering in Arizona and Florida per SAE J1976, Procedure A Color Change Surface Defects E 3.0 No objectionable defects allowed 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 All materials supplied to thi
20、s 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 Parts. 6 Approved Sources Engineering qualification
21、 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. 7 Coding System This material specification shall be referenced
22、 in other documents, drawings, VTS, CTS, etc. as follows: GMP.E/P.137 8 Release and Revisions 8.1 Release. This material specification originated by the TPE Material Specialist in January 2003. It was first published in June 2003. 8.2 Revisions. Rev Approval Date Description (Organization) A OCT 200
23、4 Revise Table 1 properties, addition of GMW3221. (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 23:22:32 MDTNo reproduction or networking permitted without license from IHS -,-,-