1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW14744 Elastomer for Grommets Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This specification covers the materials and performance of e
2、lastomeric grommets for use in body applications up to 100 C maximum. 1.1 Material Description. Materials covered by this specification are divided into three types: 1.1.1 Type A. Guiding grommets, up to continuous operating temperature of 70 C. Material defined on part drawing. 1.1.2 Type B. Guard
3、grommets, up to continuous operating temperature of 100 C. Material defined on part drawing. 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 Remarks. Not applicable. 2 References Note: Only th
4、e latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D2000 ISO 815 ISO 37 ISO 1431 ISO 48 ISO 23529 ISO 188 SAE J200 2.2 GM Standards/Specifications. GMW3059 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents
5、(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 to be taken from finished parts. If not otherwise s
6、tated, mechanical properties in delivery state and after heat or fluid immersion are to be tested at +23 C and with the same test methods. 3.1.2 Conditioning. Conditioning shall be as specified in the relevant Test Methods. 3.1.3 Equipment. Conforming to the relevant Test Methods. 3.1.4 Calibration.
7、 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 specification shall be determined correctly with respect t
8、o its physical definition. 3.1.6 Facilities. Conforming to the relevant Test Methods. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14744 Copyright 2011 General Motors Company All Rights Reserved October 2011 P
9、age 2 of 4 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 certificates, reports, etc. 3.2 Material and Performance Requirements. Material and performance requirements are summarized
10、in Table 1. Table 1: Material and Performance Properties Property Test Method Unit Value Hardness Type A, B ISO 48 Method M IRHD As specified on drawing Type C As specified on drawing/math data file Shore A As specified on drawing Elongation at Break Type A ISO 37, test piece in the shape of ring, 5
11、00 50 mm/minute % 250 minimum Type B ISO 37, Type 4 dumbbell, 200 20 mm/minute % 500 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 -2 h at +70 3 C Change in Hardness IRHD +10 maximum Type B ISO 188 Method B, 1
12、68 -2 h at +100 3 C Change in Hardness IRHD +15 maximum Type C As specified on drawing/math data file As specified on drawing Ozone Resistance Type A ISO 1431-1, 50 pphm, 20% strain on mandrel, 25 2 C, 72 -2 h, visual examination (no magnification) No cracks Type B ISO 1431-1, 50 pphm, 20% strain on
13、 mandrel, 40 2 C, 72 -2 h visual examination (no magnification) No cracks Type C As specified on drawing/math data file As specified on drawing Compression Set Type B ISO 815 test piece Type B +70 3 C, 24 -2 h, 25% compressed % 30 maximum Type C As specified on drawing/math data file As specified on
14、 drawing Cold Resistance Types A and B ISO 23529, -30 3 C, 5 +1 h Bending test r= 2.5 mm No cracks Type C As specified on drawing/math data file As specified on drawing 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws,
15、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. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WOR
16、LDWIDE ENGINEERING STANDARDS GMW14744 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 4 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 spec
17、ification 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 agreed, all testing and documentation normally
18、 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 new release. If not otherwise agreed, all rele
19、ase 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 shipments shall be made
20、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 when a change in
21、 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 MSDS/SDS require
22、ments. 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, Restricted and
23、 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 this standard. For
24、other GM locations, the responsible Engineering group should be contacted to obtain the approved source in that individual country. The responsible engineering group should be contacted to identify the approved sources in that individual country. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, A
25、bbreviations, and Symbols. GHS Globally Harmonized System IRHD International Rubber Hardness Degree MATSPC Global repository of GM Approved Materials for corresponding GM Engineering Standards MSDS Material Safety Data Sheet PPHM Parts per Hundred Million SDS Safety Data Sheet Provided by IHSNot for
26、 ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14744 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 4 of 4 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows:
27、 Material per GMW14744 Type “X“, where X = material type as defined in 1.1 9 Release and Revisions This standard was originated in October 2005. It was first approved by the Global Elastomers Team in May 2006. It was first published in November 2006. Issue Publication Date Description (Organization) 1 NOV 2006 Initial publication. 2 OCT 2011 5 Year Refresh, Compression Set test for Type B and C added (Global Elastomers Team) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
