1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15815 Thermoplastic Elastomers - Polyolefinic Plus Nitrile Rubber Based 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, f
2、uel and oil resistant, thermoplastic vulcanizates containing fully cured Acrylonitrile-Butadiene Rubber (NBR) elastomer particles dispersed in a continuous Polypropylene (PP) matrix. These materials can be processed by extrusion and injection molding. Material types are delineated by hardness values
3、. 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-(NBR + PP). 1.3 Typical Applications. Typical applications include the following: gaskets and connectors. 2 References Note: Only the latest
4、 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/Specifications. GMW3013 GMW3059 GMW3221 GMW3235 2.3 Additional References. TMC003 Material Saf
5、ety 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. Important physical, mechanical and thermal p
6、roperties 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 otherwise. 3.2 Requirements on Test Sp
7、ecimens. 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 required by this specification. 3.2.1 Tests sp
8、ecimens 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 to permit this. 3.2.2 Tests shall be c
9、onducted 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 22 C 3 C shall be conducted at the spe
10、cified 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 available. For colored grades where other
11、 pigment and additive systems (e.g., stabilizer) are used, the impact values shall not decrease more than 10% from the specified minimum value. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without lice
12、nse from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15815 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 2 of 6 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
13、 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 1 Shore A Hardness ISO 868, 15 s delay Shore A 70 5 Shore D Hardness ISO
14、 868, 15 s delay Shore D Not applicable Density ISO 1183 g/cc 0.99 to 1.04 Tensile Stress at Break ISO 37, Type 1 dumbbell, 500 mm/minute MPa 4.1 minimum Elongation at Break ISO 37, Type 1 dumbbell, 500 mm/minute % 170 minimum Tensile Stress at 100% Elongation ISO 37, Type 1 dumbbell, 500 mm/minute
15、MPa 2.1 minimum Compression Set ISO 815, Type A, 70 h at 125 C % 50 maximum Tear Strength ISO 34-1, Method B, angle die, 500 mm/minute kN/m 18 minimum Low Temperature Brittleness ISO 812, Type B C -27 maximum Properties After Short Term Heat Aging ISO 188, 168 h at 125 C in an air-circulating oven f
16、ollowed 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 Break Tensile Stress at 100% Elongation - % % % +30 maximum -45 maximum +25 maximum Copyright General Motors Company Provided by
17、 IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15815 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 3 of 6 Property Test Method Unit Type 1 Properties
18、After Long Term Heat Aging ISO 188, 1000 h at 100 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 tackiness 80 retention minimum 60 retention minimu
19、m Tensile Stress Elongation at Break - % % 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 methods are the same as for original mechanical property testing. Change in Property - Tensile Stress Elongation at Break Ten
20、sile Stress at 100% Elongation Volume Change Tear Strength - % % % % % -45 maximum -50 maximum -20 maximum 0 maximum -55 maximum Properties After Fluid Aging Tensile Stress Elongation at Break Tensile Stress at 100% Elongation Volume Change Tear Strength ISO 1817, Immersion in Sour Gasoline, 336 h a
21、t 40 C followed by the indicated property testing at 23 C. Test methods are the same as for original mechanical property testing. Change in Property % % % % % -35 maximum -45 maximum -20 maximum +35 maximum -40 maximum Ozone Resistance ISO 1431-1, Procedure A, 100 pphm, 40 C - Zero Rating Copyright
22、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 GMW15815 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 4 of 6 Property T
23、est Method Unit Type 1 Fogging GMW3235-B-T2 mg 10 No droplets or crystals are allowed upon visual inspection 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 Proce
24、ss 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 language, the English language shall take preced
25、ence. 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 to commencement of delivery of bulk supplies
26、. 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 responsibility of the supplier to inform the customer in
27、 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 commencement of delivery of non-conforming bulk
28、 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 composition of an existing product has occurred, a
29、 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 addition, product MSDS/SDS submissions must be in
30、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 Substances for Parts. 6 Approved Sources Materia
31、ls 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 used, the part supplier can use GM Material F
32、ile reference for Production Part Approval Process (PPAP) material approval. If the decision is made to use a not yet approved material, contact Materials Engineering Plastics team for details on the approval process. The material approval process must be completed prior to PPAP start date of the pa
33、rt supplied to General Motors. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without
34、license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15815 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 5 of 6 7.2 Acronyms, Abbreviations, and Symbols. CLTE Coefficient of Linear Thermal Expansion DSC Differential Scanning Calorimetry GHS Globally Harmonized Sys
35、tem of Classification and Labeling of Chemicals IR Infrared Spectroscopy IRM Industry Reference Material MSDS Material Safety Data Sheet NBR Acrylonitrile-Butadiene Rubber PP Polypropylene PPAP Production Part Approval Process pphm parts per hundred million SDS Safety Data Sheet TGA Thermogravimetri
36、c Analysis TPV Thermoplastic Vulcanizate 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW15815P-TPV(NBR+PP)-Type X Where: GMW = GM Worldwide Specification 15815 = Sequential Number P = Plastic TPV = Thermoplastic Vulcanizate NBR+PP =
37、Acrylonitrile-Butadiene Rubber plus Polypropylene Type X = Type 1 to 4 as defined in Table 1 9 Release 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 De
38、scription (Organization) 1 SEP 2008 Initial publication. 2 JAN 2013 Five year refresh of standard; replaced specific gravity with density, updated fogging procedure & requirement, removed Differential Scanning Calorimetry (DSC), Infrared Spectroscopy (IR), and Thermogravimetric Analysis (TGA) scans.
39、 (Plastics Global Subsystem Leadership Team) Cross-Reference of Replaced Specifications GMW15815P-TPV(NBR+PP) Type Specification Replaced 1 GMP.E/P.081 (GMNA) HN2390, Type 1 (GMH) 2 - 3 - 4 - Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo r
40、eproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15815 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 6 of 6 Appendix A Table A1: Type Definition Type Hardness Range 1 70 5 Shore A 2 80 5 Shore A 3 90 5 Shore A 4 40 5 Shore D Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
