1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16720 Polyethylene - Linear Ultra High Molecular Weight, Ram Extrusion Copyright 2012 General Motors Company All Rights Reserved January 2012 Originating Department: North American Engineering Standards Page 1 of 3 1 Scope 1.1 Material Descr
2、iption. This specification covers the properties of an ultra high molecular weight (UHMW), polyethylene, ram extruded with extremely low coefficient of friction. 1.2 Symbols. The material abbreviation according to ISO 11469 is PE-UHMW. 1.3 Typical Applications. Typical applications include windshiel
3、d glass run channel. 1.4 Remarks. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 306 ISO 1628-3 ISO 527-1/2 ISO 1872-2 ISO 1183 ISO 11469 2.2 GM Standards/Specifications. GMW3013 GMW3221 GMW3
4、059 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Requirements on Test Specimens. Unless otherwise specified, compression molding of test specimens shall be accomplished per ISO 1872-2. Test methods and specimen dimensions are als
5、o to be in accordance with ISO 1872-2. All tests shall be performed on specimens 40 h minimum after molding and immediately following a conditioning period of 24 h minimum in a controlled atmosphere per GMW3221, Code A, unless otherwise specified. All tests shall be performed on unannealed specimens
6、. The values specified in Table 1 shall be met by test specimens in natural or black. 3.1.1 Chemical Requirements. All parts manufactured from molding compounds shall be resistant to the media they contact at their place of use. 3.2 Requirements on Materials. Materials approved to this specification
7、 shall meet the requirements of GMW3013, General Requirements for Handling of Technical Terms of Delivery for Plastics. 3.3 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize the material are summarized in Table 1. Note: For each product, the requiremen
8、ts to Table 1 shall be documented by a Certification Statement according to GMW3013. 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 GMW1672
9、0 Copyright 2012 General Motors Company All Rights Reserved January 2012 Page 2 of 3 Table 1: Compound Properties (Natural) Property Standard Note 1 Units Value Density ISO 1183/A g/cm3 Target Range 0.93 0.005 Intrinsic Viscosity ISO 1628-3 dl/g Target Range 30 4 Tensile Strength at Break ISO 527-1/
10、2 MPa 34 to 46 Tensile Strain at Break ISO 527-1/2 % 275 Tensile Modulus ISO 527-1/2 MPa 545 Vicat Softening Temperature ISO 306 C 75 Note 1: Standard test specimen and test setup should follow GMW3013. 3.4 Compound Properties. See Table 1. The following are also required for full specification appr
11、oval. The minimum number of lots per test required is one in natural: Poissons Ratio, Stress/Strain Curve at +23 C. See GMW3013 for the test procedures. 3.5 Performance Requirements. Performance requirements shall be specified on part drawings or in component specifications. 4 Manufacturing Process
12、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 precedenc
13、e. 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. A
14、 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 a
15、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 su
16、pplies. In individual cases, a shorter test can be agreed to between the responsible Engineering department and the supplier. 5.4 Initial Source Approval. No shipments shall be made by any supplier until representative initial production samples have been approved by the appropriate Materials Engine
17、ering department(s) as meeting the requirements of this specification. 5.5 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 Da
18、ta 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 compliance with specific country General Motors TMC003 Mat
19、erial Safety Data Sheet/Safety Data Sheet guidance documents where available. 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 GMW16720 Copyr
20、ight 2012 General Motors Company All Rights Reserved January 2012 Page 3 of 3 5.6 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualifications of an approved source are required for
21、 this standard. Only sources listed in the GM Materials File (i.e., MATSPC) under this standard number have been qualified by Engineering as meeting the requirements of this standard. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards.
22、 7.2 Acronyms, Abbreviations, and Symbols. GHS Globally Harmonized System MSDS Material Safety Data Sheet SDS Safety Data Sheet UHMW Ultra High Molecular Weight 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16720P-PE Where: GMW = GM
23、 Worldwide 16720 = Sequential number P = Plastics PE = Polyethylene 9 Release and Revisions This standard was originated in November 2011. It was first approved by the Plastics Global Subsystem Leadership Team in January 2012. It was first published in January 2012. Issue Publication Date Descriptio
24、n (Organization) 1 JAN 2012 Initial publication. Cross Reference of Replaced Specifications Standard No. Replaced Specification GMW16720 GMP.PE.051 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
