1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW14661 Elastomer for Damping Parts Chassis Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This standard covers the materials and performa
2、nce of elastomeric materials used for damping parts in chassis applications (e.g., bushings, strut mounts, and stabilizer bearings). 1.1 Material Description. Materials covered by this standard are divided into two types: 1.1.1 Type A. Elastomer up to +70 C. 1.1.2 Type B. Drawing defined (e.g., usin
3、g SAE J200 or ASTM D2000 line callout). 1.2 Symbols. Not applicable. 1.3 Typical Applications. Not applicable. 1.4 Remarks. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D2000 ISO 1431-1 IS
4、O 48 ISO 7619-1 ISO 188 ISO 23529 ISO 815 SAE J200 2.2 GM Standards/Specifications. GMW3059 2.3 Additional References. TMC003 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 tes
5、t pieces shall be in accordance with the relevant test procedure. Unless otherwise specified, samples are finished parts or 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
6、test procedures. 3.1.2 Conditioning. Conditioning shall be as specified in the relevant test procedures. 3.1.3 Equipment. Conforming to the relevant test procedures. 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 Al
7、ternatives. Alternative test facilities and equipment may also be used. However, all measuring variables as specified in this specification shall be determined correctly with respect to its physical definition. 3.1.6 Facilities. Conforming to the relevant test procedures. 3.1.7 Deviations. Deviation
8、s from the requirements of this standard shall have been agreed upon. Such deviations shall be specified on component drawings, test certificates, reports, etc. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW146
9、61 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 2 of 4 3.2 Material and Performance Requirements. Material and performance requirements are summarized in Table 1. Table 1: Material and Performance Properties Property Test Method Unit Value Hardness Type A ISO 7619-1 IS
10、O 48 Shore A IRHD Nominal Value Note 1 As specified on drawing Type B As specified on drawing/math data file Shore A Nominal Value Note 1 As specified on drawing Age Resistance (Heat Aging) Type A ISO 188 Method B,168 -2 h at +70 3 C Change in Hardness Shore A/IRHD + 10 maximum Type B As specified o
11、n drawing/math data file As specified on drawing Compression Set Type A ISO 815 test piece Type B +70 3 C, 24 -2 h, 25% compressed % 30 maximum Type B As specified on drawing/math data file % As specified on drawing Ozone Resistance Type A ISO 1431-1, 50 pphm, 25 2 C, 20% strain, visual examination
12、No cracks permissible Type B As specified on drawing/math data file As specified on drawing Cold Resistance Type A ISO 23529, -30 3 C; 5 +1 h Change in Hardness For initial hardness 64 Shore A For initial hardness 65 Shore A Shore A Shore A +20 maximum +15 maximum Type B As specified on drawing/math
13、 data file As specified on drawing Note 1: Nominal hardness implies a tolerance of 5 Shore A/IRHD, but the specific dynamic rate of the finished part overrides the hardness requirement. 4 Manufacturing Process Not applicable 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy a
14、pplicable 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 materi
15、al 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, lo
16、cation 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 m
17、aterials and/or processes and to apply for a new release. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14661 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 4 If not otherwise
18、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 Initial Source Approval. No shipment
19、s shall be made by any supplier until representative initial production samples have been approved by the appropriate Materials Engineering 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
20、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 Classification and Labeling of Chemicals (GHS) requirements or other country-specific
21、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. 5.6 All materials supplied to this standard must comply with the requirements of GMW3059
22、, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualifications of an approved source are required for this standard. Only sources listed in the GM Materials File (MATSPC) under this standard number have been qualified by Engineering as meeting the requirements of thi
23、s standard. For other GM locations, the responsible Engineering group should be contacted to obtain the approved source in that individual country. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. EPDM Ethylene Propylene Diene Monomer GHS Globally Harmonized System HH
24、Nominal hardness IR Isoprene Rubber IRHD International Rubber Hardness Degree MATSPC Global repository of GM Approved Materials for corresponding GM Engineering Standards. MSDS Material Safety Data Sheet NR Natural Rubber PPHM Part per Hundred Million SDS Safety Data Sheet 8 Coding System This stand
25、ard shall be referenced in other documents, drawings, etc., as follows: Material Y per GMW14661, Type “X“, Hardness HH Where: Y = Elastomer type (NR, IR, EPDM, etc.) X = Material type as defined in Section 1.1. HH = Nominal hardness (nominal value) Example: NR per GMW14661, Type A, Hardness 65 Shore
26、 A Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14661 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 4 of 4 9 Release and Revisions This standard was originated in October 2005. It
27、 was first approved by the Global Elastomers Team in July 2006. It was first published in July 2006. Issue Publication Date Description (Organization) 1 JUL 2006 Initial publication. 2 OCT 2011 5 Year Refresh. (Global Elastomers Team) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
