1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15814 Thermoplastic Elastomers - Polyolefinic, Partially Crosslinked Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 1 of 6 1 Scope 1.1 Material Description. This specification covers the properties of black, gene
2、ral purpose, heat stabilized, thermoplastic vulcanizates containing partially crosslinked Ethylene-Propylene-Diene Monomer (EPDM) elastomer particles dispersed in a continuous Polypropylene (PP) matrix. These materials can be processed by extrusion and injection molding. Material types are delineate
3、d 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 the following: seals and gaskets. 2 References Note:
4、 Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 34-1 ISO 188 ISO 868 ISO 18064 ISO 37 ISO 812 ISO 1183 SAE J1976 ISO 105-B06 ISO 815 ISO 1431-1 SAE J2527 2.2 GM Standards/Specifications. GMW3013 GMW3059 GMW3221 GMW3235 2.3 Add
5、itional 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 Delivery for Plastics. 3.1 Requirements on Delivery. Impor
6、tant 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 specified on drawings, in material specifications and
7、 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 procedures, processes, and/or handling the materials require
8、d 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 direction of flow. Plaque dimensions must be sufficient
9、 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 addition, tests specified at temperatures below or above
10、 22 C 3 C shall be conducted at the specified temperature using specimens conditioned at the specified temperature for 4 h minimum. 3.2.3 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 av
11、ailable. For colored grades where other pigment and Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15814 Copyright 2013 General Motors C
12、ompany All Rights Reserved January 2013 Page 2 of 6 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 shall be tested to Table 1. The following are also requir
13、ed 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 Method Unit Type 3 Type 5 Type 6 Shore A Hardness ISO
14、868, 15 s delay Shore A 45 5 65 5 75 5 Density ISO 1183 g/cc 0.93 to 1.05 0.97 to 1.04 0.96 to 1.02 Tensile Stress at Break ISO 37, Type 1 dumbbell, 500 mm/minute MPa 2.1 minimum 3.3 minimum 4.5 minimum Elongation at Break ISO 37, Type 1 dumbbell, 500 mm/minute % 200 minimum 380 minimum 490 minimum
15、Tensile Stress at 100% Elongation ISO 37, Type 1 dumbbell, 500 mm/minute MPa 0.8 minimum 2.0 minimum 2.8 minimum Compression Set ISO 815, Type A, 22 h at 70 C % 45 maximum 45 maximum 55 maximum Tear Strength ISO 34-1, Method B, angle die, 500 mm/minute kN/m 8 minimum 21 minimum 30 minimum Low Temper
16、ature Brittleness ISO 812, Type B C -54 maximum Properties After Heat Aging ISO 188, 1000 h at 120 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 Property No objectionable color change or t
17、ackiness Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15814 Copyright 2013 General Motors Company All Rights Reserved January 2013 Pag
18、e 3 of 6 Property Test Method Unit Type 3 Type 5 Type 6 Tensile Stress Elongation at Break % % 75 retention minimum 75 retention minimum Ozone Resistance ISO 1431-1, Procedure A, 100 pphm, 40 C - Zero Rating Fogging GMW3235-B-T2 mg 10 No droplets or crystals are allowed upon visual inspection Colorf
19、astness to Light ISO 105-B06 Condition 5, rotating rack 1 rpm, 1240.8 kJ/m2 - E 3.0 No objectionable defects allowed Change in Color Surface Defects - Accelerated Weathering SAE J2527 with Extended ultraviolet (UV) Filters, 2500 kJ/m2 - E 3.0 No objectionable defects allowed Change in Color Surface
20、Defects - Natural Weathering Note 1 2 years exposure to natural weathering in Arizona and Florida per SAE J1976, Procedure A - E 3.0 No objectionable defects allowed Color Change Surface Defects - Note 1: In case of conflict between accelerated weathering and natural weathering, natural weathering t
21、akes precedence. 3.4 Performance Requirements. Performance requirements, e.g., flammability, resistance to odor, etc., shall be specified on part drawings or in component specifications. 4 Manufacturing Process Not applicable. Copyright General Motors Company Provided by IHS under license with Gener
22、al Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15814 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 4 of 6 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy
23、 applicable laws, rules, regulations and recommendations valid in the country of usage. 5.2 Language. In the event of conflict between the English and domestic language, the English language shall take precedence. 5.3 Inspection and Rejection. Samples of components or materials released to a GM mate
24、rial specification shall be tested for conformity with the requirements of this material specification and approved by the responsible Engineering department prior to commencement of delivery of bulk supplies. A new approval must be received for any changes, e.g., properties, manufacturing process,
25、location of manufacture, etc. If not otherwise agreed, all testing and documentation normally required for initial release must be completed. It is the responsibility of the supplier to inform the customer in a timely manner, without solicitation, and to include documentation of all modifications of
26、 materials and/or processes and to apply for a new release. If not otherwise agreed, all release tests shall be repeated and documented by the supplier prior to commencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreed to between the responsible Engi
27、neering department and the supplier. 5.4 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical composition of an existing product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in comp
28、liance with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In addition, product MSDS/SDS submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Dat
29、a Sheet guidance documents where available. 5.5 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Materials supplied to this specification must be approved by General Motors. A list of approved mat
30、erials can be found in MATSPC. This GM Material File is provided to third parties to reduce redundant testing of materials. If approved material already listed is used, the part supplier can use GM Material File reference for Production Part Approval Process (PPAP) material approval. If the decision
31、 is made to use a not yet approved material, contact Materials Engineering Plastics group for details on the approval process. The material approval process must be completed prior to PPAP start date of the part supplied to General Motors. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approv
32、ed materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. CLTE Coefficient of Linear Thermal Expansion DSC Differential Scanning Calorimetry EPDM Ethylene Propylene-Diene Monomer GHS Globally Harmonized System of Classification and Labeling of Chemicals IR In
33、frared Spectroscopy MSDS Material Safety Data Sheet PP Polypropylene PPAP Production Part Approval Process pphm parts per hundred million SDS Safety Data Sheet TGA Thermogravimetric Analysis TPV Thermoplastic Vulcanizate Copyright General Motors Company Provided by IHS under license with General Mot
34、ors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15814 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 5 of 6 UV Ultraviolet 8 Coding System This standard shall be referenced in other docum
35、ents, drawings, etc., as follows: Material per GMW15814P-TPV(EPDM+PP)-Type X Where: GMW = GM Worldwide Specification 15814 = Sequential Number P = Plastic TPV = Thermoplastic Vulcanizate (EPDM+PP) = Ethylene Propylene Diene Monomer plus Polypropylene Type X = Type 1 to 6 as defined in Table 1 9 Rele
36、ase and Revisions This standard was originated in February 2008. It was first approved by the Global Plastics Team in September 2008. It was first published in September 2008. Issue Publication Date Description (Organization) 1 SEP 2008 Initial publication. 2 JAN 2013 Five year refresh of standard;
37、replaced specific gravity with density, updated fogging procedure and requirement, removed Differential Scanning Calorimetry (DSC), Infrared Spectroscopy (IR), and Thermogravimetric Analysis (TGA) scans. (Plastics Global Subsystem Leadership Team) Cross-Reference of Replaced Specifications GMW15814P
38、-TPV(EPDM+PP) Type Specification Replaced 1 2 3 GMP.E/P.065 4 5 GMN8154 (aka GMP.E/P.112) 6 GMP.E/P.132 7 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEER
39、ING STANDARDS GMW15814 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 6 of 6 Appendix A Table A1: Type Definition Type Hardness Range 1 25 5 Shore A 2 35 5 Shore A 3 45 5 Shore A 4 55 5 Shore A 5 65 5 Shore A 6 75 5 Shore A 7 85 5 Shore A Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
