1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16233 Thermoplastic Elastomers - Styrenic, Exterior Copyright 2012 General Motors Company All Rights Reserved September 2012 Originating Department: North American Engineering Standards Page 1 of 5 1 Scope 1.1 Material Description. This spec
2、ification covers the properties of black, heat stabilized, weatherable thermoplastic elastomers consisting of polypropylene (PP) and styrene/ethylene/butylene/styrene (SEBS) rubber for exterior applications. Material types are delineated by hardness values. The types and corresponding hardnesses are
3、 defined in Appendix A, Table A1. 1.2 Symbols. The material abbreviation according to ISO 18064 is TPS-SEBS. 1.3 Typical Applications. Typical applications include the following: exterior lace and closeouts. 2 References Note: Only the latest approved standards are applicable unless otherwise specif
4、ied. 2.1 External Standards/Specifications. ISO 34-1 ISO 812 ISO 1183 ISO 18064 ISO 37 ISO 868 ISO 1431-1 SAE J1976 ISO 188 2.2 GM Standards/Specifications. GMW3013 GMW3059 GMW3221 GMW14650 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirement
5、s 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 Test Specimens. Tests shall be conducted using the latest issue of the test methods indicated. Suitable precautions sh
6、ould 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. 3.1.1 Tests specimens shall be die cut from fan gated injection molded plaques having a nominal thickness of 2.0 mm 0.2 mm. D
7、ie 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. 3.1.2 Tests shall be conducted 40 h minimum after molding and immediately following a conditioning period of 24 h minimum per GMW3221
8、, Code A, unless otherwise specified. All tests shall be performed on unannealed specimens. In addition, 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. 3.1.3 The minimum
9、 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 10%
10、from the specified minimum value. 3.2 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. Th
11、e color shall be specified on drawings, in material specifications and otherwise. 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 GMW16233 C
12、opyright 2012 General Motors Company All Rights Reserved September 2012 Page 2 of 5 3.3 Compound Properties. See Table 1. A minimum of six lots shall 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 Mo
13、dulus Poissons Ratio Coefficient of Linear Thermal Expansion (CLTE) Stress-Strain Curve at 23 C Table 1: Compound Properties (Black) Property Test Method Unit Type 1 2 3 4 Shore A Hardness ISO 868, 15 s delay Shore A 50 5 60 5 70 5 75 5 Density ISO 1183 1.12 to 1.26 Tensile Stress at Break ISO 37, T
14、ype 1 dumbbell, 500 mm/minute MPa 2.0 minimum 2.7 minimum 4.0 minimum 4.5 minimum Elongation at Break ISO 37, Type 1 dumbbell, 500 mm/minute % 500 minimum 300 minimum 300 minimum 450 minimum Tensile Stress at 100% Elongation ISO 37, Type 1 dumbbell, 500 mm/minute MPa 0.2 minimum 1.0 minimum 2.0 mini
15、mum 1.5 minimum Tear Strength ISO 34-1, Method B, angle die, 500 mm/minute kN/m 15.0 minimum 18.0 minimum 20.0 minimum 26.0 minimum Low Temperature Brittleness ISO 812, Type B C -40 maximum Properties After Long Term Heat Aging ISO 188, 1000 h at 110 C in an air-circulating oven followed by indicate
16、d property testing at 23 C. Test methods are the same as for original mechanical property testing. Change in Property - Tensile Stress % 70 retention minimum Elongation at Break % 70 retention minimum Ozone Resistance ISO 1431-1, Procedure A, 100 pphm, 40 C - Zero Rating Accelerated Weathering Test
17、to GMW14650 (Weather-Ometer Resistance) Class 3 - Change in color E 3.0 maximum Surface defects - No objectionable defects allowed Solar Weathering Note 1 2 years exposure to Natural weathering in Arizona and Florida per SAE J1976, Procedure A - - Color change - E 3.0 maximum Surface defects - - No
18、objectionable defects allowed Note 1: In case of conflict between accelerated weathering and natural weathering, natural weathering takes precedence. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted withou
19、t license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16233 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 3 of 5 3.4 Performance Requirements. Performance requirements, e.g., flammability, resistance to odor, etc., shall be specified on part drawings or in comp
20、onent specifications. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy 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 langu
21、age, the English language shall take precedence. 5.3 Inspection and Rejection. Samples of components or materials released to a GM material specification shall be tested for conformity with the requirements of this material specification and approved by the responsible Engineering department prior t
22、o commencement of delivery of bulk supplies. A new approval must be received for any changes, e.g., properties, manufacturing process, location of manufacture, etc. If not otherwise agreed, all testing and documentation normally required for initial release must be completed. It is the responsibilit
23、y of the supplier to inform the customer in a timely manner, without solicitation, and to include documentation of all modifications of 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 comm
24、encement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreed to between the responsible Engineering 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 composi
25、tion of an existing product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in compliance with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In additio
26、n, product MSDS/SDS submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance documents where available. 5.5 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Subst
27、ances for Parts. 6 Approved Sources Materials supplied to this specification must be approved by General Motors. A list of approved materials 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 us
28、ed, the part supplier can use GM Material File reference for Production Part Approval Process (PPAP) material approval. If the decision is made to use a not yet approved material, contact the Global Plastics Team for detail on the approval process. The material approval process must be completed pri
29、or to PPAP start date of the part supplied to General Motors. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. CLTE Coefficient of Linear Thermal Expansion GHS Globally Harmonized System of
30、Classification and Labeling of Chemicals GSSLT Global Subsystem Leadership Team MSDS Material Safety Data Sheet PP Polypropylene PPAP Production Part Approval Process pphm parts per hundred million Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for Resa
31、leNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16233 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 4 of 5 SDS Safety Data Sheet SEBS Styrene/Ethylene/Butylene/Styrene TPS Thermoplastic Elastomer Styrenic 8
32、Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16233P-TPS-SEBS-Type X Where: GMW = GM Worldwide Specification 16233 = Sequential Number P = Plastic TPS = Thermoplastic Elastomer Styrenic SEBS = Styrene/Ethylene/Butylene/Styrene Type X
33、= Type 1 to 4, as defined in Table 1 9 Release and Revisions This standard was originated in June 2009. It was first approved by the Global Plastics Team in July 2009. It was first published in July 2009. Issue Publication Date Description (Organization) 1 JUL 2009 Initial publication. 2 JAN 2012 Ed
34、it Table 1 Properties. (Plastics Global Subsystem Leadership Team (GSSLT) 3 FEB 2012 Correct Table 1 Properties (Plastics GSSLT) 4 SEP 2012 Add Type 4. Edit Table 1: - Change title “Specific Gravity” to “Density”. - Update test method for Accelerated Weathering. (Plastics Global Subsystem Leadership
35、 Team) 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 GMW16233 Copyright 2012 General Motors Company All Rights Reserved September 2012 Pag
36、e 5 of 5 Appendix A Table A1: Type Definitions Type Hardness Range 1 50 5 Shore A 2 60 5 Shore A 3 70 5 Shore A 4 75 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-,-,-
