GMW GMW15817-2013 Thermoplastic Elastomers - Polyolefinic Fully Crosslinked Underhood Nylon Bondable Issue 2 English.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15817 Thermoplastic Elastomers - Polyolefinic, Fully Crosslinked, Underhood, Nylon Bondable Copyright 2013 General Motors Company All Rights Reserved December 2013 Page 1 of 5 1 Scope 1.1 Material Description. This specification covers the p
2、roperties of black, heat stabilized, thermoplastic vulcanizates containing fully crosslinked Ethylene-Propylene-Diene Monomer (EPDM) elastomer particles dispersed in a continuous Polypropylene (PP) matrix. These materials are formulated to bond to polyamides (Nylon 6 and Nylon 6,6) and can be proces
3、sed by injection molding. Material types are delineated by hardness values. The types and corresponding hardnesses available are identified in Appendix A, Table A1. 1.2 Symbols. The material abbreviation according to ISO 18064 is TPV-(EPDM+PP). 1.3 Typical Applications. Typical applications include
4、the following: air duct cuffs, radiator fan shroud seals. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 34-1 ISO 812 ISO 1183 ISO 18064 ISO 37 ISO 815 ISO 1431-1 ISO 188 ISO 868 ISO 1817 2.2 GM Standards/Sp
5、ecifications. GMW3013 GMW3059 GMW3221 GMW3235 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements Materials approved to this specification shall meet the requirements of GMW3013, General Requirements for Handling of Technical Terms of Deliv
6、ery for Plastics. 3.1 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize the material are summarized in Table 1. Note: For each product, the requirements to Table 1 shall be documented by Certification Statement according to GMW3013. The color shall be
7、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 are not exceeded when conducting test procedu
8、res, processes, and/or handling the materials required by this specification. 3.2.1 Tests specimens shall be die cut from fan gated injection molded plaques having a nominal thickness of 2.0 mm 0.2 mm. Die cut specimens are to be tested with the long axis of the test specimen perpendicular to the di
9、rection of flow. Plaque dimensions must be sufficient to permit this. 3.2.2 Tests shall be conducted 40 h minimum after molding 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 add
10、ition, tests specified at temperatures below or above 22 C 3 C shall be conducted at the specified temperature using specimens conditioned at the specified temperature for 4 h minimum. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduc
11、tion or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15817 Copyright 2013 General Motors Company All Rights Reserved December 2013 Page 2 of 5 3.2.3 The minimum values specified in the property tables must be met by test specimens in natural, black, or in a
12、 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 the specified minimum value. 3.3 Compound Properties. See Table 1. A minimum of six lots sha
13、ll be tested to Table 1. The following are also required for full specification approval (the minimum number of lots per test required is one): Youngs Modulus Poissons Ratio, Coefficient of Linear Thermal Expansion (CLTE) Stress-Strain Curve at 23 C Table 1: Compound Properties (Black) Property Test
14、 Method Unit Type 1 Type 2 Shore A Hardness ISO 868, 15 s delay Shore A 55 5 70 5 Density ISO 1183 g/cc 0.93 to 0.97 0.93 to 0.98 Tensile Stress at Break ISO 37, Type 1 dumbbell, 500 mm/minute MPa 1.8 minimum 4.0 minimum Elongation at Break ISO 37, Type 1 dumbbell, 500 mm/minute % 180 minimum 270 mi
15、nimum Tensile Stress at 100% Elongation ISO 37, Type 1 dumbbell, 500 mm/minute MPa 0.9 minimum 2.4 minimum Compression Set ISO 815, Type A, 70 h at 125 C % 65 maximum 70 maximum Tear Strength ISO 34-1, Method B, angle die, 500 mm/minute kN/m 13 minimum 13 minimum Low Temperature Brittleness ISO 812,
16、 Type B C -55 maximum -54 maximum Properties After Short Term Heat Aging ISO 188, 168 h at 135 C in an air-circulating oven followed by the indicated property testing at 23 C. Test methods are the same as for original mechanical property testing. Change in Property - - Tensile Stress Elongation at B
17、reak Tensile Stress at 100% Elongation % % % -30 maximum -25 maximum +10 maximum -50 maximum -50 maximum +25 maximum Properties After Long Term Heat Aging ISO 188, 1000 h at 125 C in an air-circulating oven followed by indicated property testing at 23 C. Test methods are the same as for original mec
18、hanical property testing. Change in Property No objectionable color change or tackiness Tensile Stress Elongation at Break % % 50 retention minimum 50 retention minimum Properties After Fluid Aging ISO 1817, Immersion in IRM 903, 70 h at 125 C followed by the indicated property testing at 23 C. Test
19、 methods are the same as for original mechanical property testing. Change in Property Tensile Stress Elongation at Break Volume Change % % % -75 maximum -85 maximum +150 maximum -75 maximum -85 maximum +110 maximum Ozone Resistance ISO 1431-1, Procedure A, 100 pphm, 40 C Zero Rating Fogging GMW3235-
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