1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15175 Elastomer for Pads of Metal or Plastic Clamps Copyright 2012 General Motors Company All Rights Reserved September 2012 Originating Department: North American Engineering Standards Page 1 of 3 1 Scope This specification covers the mater
2、ials and performance of elastomeric materials used for pads on metal or plastic clamps. 1.1 Material Description. Materials covered by this specification are divided into three types. 1.1.1 Type A. Elastomer up to +125 C permanent. For parts, which are suspended thermally higher loads, including eng
3、ine compartment. 1.1.2 Type B. Elastomer up to +100 C permanent. For parts, which are used exclusively outside of the engine compartment. 1.1.3 Type C. Drawing defined (e.g., using SAE J200 or ASTM D2000 line callout). 1.2 Symbols. Not applicable. 1.3 Typical Applications. Not applicable. 1.4 Remark
4、s. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D2000 ISO 188 ISO 1431-1 ISO 23529 ISO 37 ISO 815 ISO 7619-1 SAE J200 2.2 GM Standards/Specifications. GMW3059 2.3 Additional References. TM
5、C003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Resources. 3.1.1 Test Samples. Unless otherwise specified, the shape, size and number of test pieces shall be in accordance with the relevant test method. Unless otherwise specified, samples are finished parts or
6、to be taken from finished parts. If not otherwise stated, mechanical properties in delivery state and after heat or fluid immersion are to be tested at +23 C and with the same test method. 3.1.2 Conditioning. Conditioning shall be as specified in the relevant test method. 3.1.3 Equipment. Conforming
7、 to the relevant test method. 3.1.4 Calibration. The test facilities and equipment shall be in good working order and shall have a valid calibration label. 3.1.5 Alternatives. Alternative test facilities and equipment may also be used. However, all measuring variables as specified in this specificat
8、ion shall be determined correctly with respect to its physical definition. 3.1.6 Facilities. Conforming to the relevant test method. 3.1.7 Deviations. Deviations from the requirements of this specification shall have been agreed upon. Such deviations shall be specified on component drawings, test ce
9、rtificates, reports, etc. 3.2 Material and Performance Requirements. Material and performance requirements are summarized in Table 1. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from I
10、HS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15175 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 2 of 3 Table 1: Material and Performance Properties Property Test Method Unit Value Hardness Type A and B ISO 7619-1 Shore A As specified on drawing Type C As specified on
11、 drawing/math data file Shore A As specified on drawing Elongation at Break Type A and B ISO 37, Type 2 or 4 dumbbell, 200 mm/minute 20 mm/minute % 200 minimum Type C As specified on drawing/math data file % As specified on drawing Age Resistance (Heat Aging) Type A ISO 188 Method B,168 h -2 h at +1
12、25 C 3 C Change in Hardness Shore A +15 maximum Type B ISO 188 Method B,168 h -2 h at +100 C 3 C Change in Hardness Shore A +10 maximum Type C As specified on drawing/math data file As specified on drawing Compression Set Type A and B ISO 815 test piece Type B +70 C 3 C, 24 h -2 h, 25% compressed %
13、40 maximum Type C As specified on drawing/math data file % As specified on drawing Ozone Resistance Type A and B ISO 1431-1, 50 pphm, 25 C 2 C, 20% strain, visual examination No cracks permissible Type C As specified on drawing/math data file As specified on drawing Cold Resistance Type A and B ISO
14、23529, -30 C 3 C; 5 h +1 h Change in Hardness Shore A +20 maximum Type C As specified on drawing/math data file MPa As specified on drawing 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recomm
15、endations 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 material specification shall be tested for conformi
16、ty 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, location of manufacture, etc. If not otherwise
17、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 materials and/or processes and to apply for a
18、new release. 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 GMW15175 Copyright 2012 General Motors Company All Rights Reserved September 20
19、12 Page 3 of 3 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 Engineering department and the supplier. 5.4 Mate
20、rial 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 compliance with the Globally Harmonized System of
21、 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 Data Sheet guidance documents where available. 5
22、.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 materials can be found in MATSPC. This GM Materi
23、al 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 is made to use a not yet approved material,
24、contact the Elastomers Global Subsystem Leadership Team 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 Approved Materials for Corresponding GM
25、Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. ASTM ASTM International GHS Globally Harmonized System of Classification and Labeling of Chemicals MPa Megapascal MSDS Material Safety Data Sheet PPAP Production Part Approval Process PPHM Parts per Hundred Million SAE SAE Internationa
26、l SDS Safety Data Sheet 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW15175, Type “X“, Where: X = Material type as defined in Section 1.1. 9 Release and Revisions This standard was originated in February 2006. It was first approved
27、by the Global Elastomers Team in May 2006. It was first published in February 2007. Issue Publication Date Description (Organization) 1 FEB 2007 Initial publication. 2 SEP 2012 5 Year Refresh. (Elastomers Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
