1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW14561 Elastomer for Hydraulic Damping Parts Chassis Copyright 2012 General Motors Company All Rights Reserved February 2012 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This specification covers the materi
2、als and performance of elastomeric materials used for hydraulic damping parts in chassis applications (hydro bushings). 1.1 Material Description. Materials covered by this specification are divided into two types: 1.1.1. Type A: Elastomer up to +70 C. 1.1.2 Type B: Drawing defined (e.g., using SAE J
3、200 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 188 ISO 1817 ISO
4、 23529 ISO 37 ISO 815 ISO 7619-1 SAE J200 ISO 48 ISO 1431-1 ISO 11357-2 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, s
5、ize and number of test pieces shall be in accordance with the relevant test method. 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
6、and with the same test methods. 3.1.2 Conditioning. Conditioning shall be as specified in the relevant test method. 3.1.3 Equipment. Conforming 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
7、.1.5 Alternatives. 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 method. 3.1.7 Deviations. Deviat
8、ions from the requirements of this standard shall have been agreed upon. Such deviations shall be specified on component drawings, test certificates, reports, etc. 3.2 Material and Performance Requirements. Material and performance requirements are summarized in Table 1. Copyright General Motors Com
9、pany Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14561 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 2 of 4 Table 1: Material and Perfo
10、rmance Properties Property Test Method Unit Value Hardness Type A ISO 7619-1 ISO 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 Elongation at Break Type A ISO 37, Type 4 dumbbell, 200 mm/
11、minute 20 mm/minute % 350 minimum Type B As specified on drawing/math data file % As specified on drawing Tensile Strength Type A ISO 37, Type 4 dumbbell, 200 mm/minute 20 mm/minute MPa 14 minimum Type B As specified on drawing/math data file MPa As specified on drawing Age Resistance (Heat Aging) T
12、ype A ISO 188, Method B, 168 h -2 h at +70 C 3 C Change in Hardness Change in Elongation at Break Change in Tensile Strength Shore A/IRHD % % +10 maximum -30 maximum -15 maximum Type B As specified on drawing/math data file - As specified on drawing Compression Set Type A ISO 815 test piece Type B +
13、70 C 3 C, 24 h -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 C 2 C, 20% strain, 72 h -2 h Visual Examination - No cracks permissible Type B As specified on drawing/math data file - As specifie
14、d on drawing Cold Resistance Type A ISO 23529, -30 C 3 C; 5 h +1 h Change in Hardness Shore A +15 maximum Type B As specified on drawing/math data file - As specified on drawing Resistance to Hydraulic Fluid Type A ISO 1817 to hydraulic fluid used in hydro bushing 168 h -2 h at +70 C 3 C Change in H
15、ardness Change in Volume Change in Elongation at Break Change in Tensile Strength Shore A/IRHD % % % 5 maximum 5 maximum -30 maximum -40 maximum Type B As specified on drawing/math data file - As specified on drawing Glass Transition Temperature, Tg Type A ISO 11357-2 C -30 or lower Type B As specif
16、ied on drawing/math 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. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot
17、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14561 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 3 of 4 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All m
18、aterials 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 precedence. 5.3 Inspection and Rejection. Samples of components or materials
19、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 new approval must be received for any changes, e.g., properties, ma
20、nufacturing 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 timely manner, without solicitation, and to include documentation of
21、 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 supplies. In individual cases, a shorter test can be agreed to between
22、 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 Engineering department(s) as meeting the requirements of this specificatio
23、n. 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 Data Sheet must be submitted in compliance with the Globally Harmonize
24、d 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 Material Safety Data Sheet/Safety Data Sheet guidance documents where a
25、vailable. 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 this standard. Only sources listed in the GM Materials File under t
26、his standard number have been qualified by Engineering as meeting the requirements of this 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, Abbreviatio
27、ns, and Symbols. CTS Component Technical Specification EPDM Ethylene Propylene Diene Terpolymer GHS Globally Harmonized System of Classification and Labeling of Chemicals IR Isoprene Rubber IRHD International Rubber Hardness Degree MSDS Material Safety Data Sheet NR Natural Rubber Pphm Parts per hun
28、dred million SDS Safety Data Sheets VTS Vehicle Technical Specification 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 GMW14561 Copyright 2
29、012 General Motors Company All Rights Reserved February 2012 Page 4 of 4 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material Y per GMW14561, Type “X“, Hardness HH Note Where: Y = Elastomer type (natural rubber (NR), isoprene rubber (IR), ethylen
30、e propylene diene terpolymer (EPDM), etc.) X = Material type as defined in Section 1.1 HH = nominal hardness (nominal value) Example: NR per GMW14561, Type A, Hardness 65 Shore A Note: Hardness and Material may intentionally be left blank for Vehicle Technical Specification (VTS) or Component Techni
31、cal Specification (CTS) and shall be identified on the drawing once the specific dynamic rate of application has been met. 9 Release and Revisions This standard was originated in October 2005. It was first approved by the Global Elastomers Team in July 2006. It was first published in November 2006.
32、Issue Publication Date Description (Organization) 1 NOV 2006 Initial publication. 2 FEB 2012 5 Year Refresh. (Global Elastomers GSSLT) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
