1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW14742 Elastomer for Pad Brake Pedal and Pad Clutch Pedal Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: North American Engineering Standards Page 1 of 3 1 Scope This standard covers the materia
2、ls and performance of elastomeric materials used for pad brake pedal and pad clutch pedal. 1.1 Material Description. Materials covered by this standard are divided into two types: 1.1.1 Type A. Elastomer. 1.1.2 Type B. Drawing defined (e.g., using SAE J200 or ASTM D2000 line callout) 1.2 Symbols. No
3、t 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 ISO 37 ISO 7619-1 ISO 188 ISO 23529 ISO 815 SAE J200 2.2
4、GM Standards/Specifications. GMW3059 GMW3283 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 test pieces shall be in accordance with the relev
5、ant Test Methods. 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 Test Methods. 3.1.2 Conditioning. Conditioning s
6、hall be as specified in the relevant Test Methods. 3.1.3 Equipment. Conforming to the relevant Test Methods. 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
7、 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 Methods. 3.1.7 Deviations. Deviations from the requirements of this standard shall have been agr
8、eed 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 GMW14742 Copyright 2011 General Motors Company All Rights Reserved
9、 October 2011 Page 2 of 3 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 Shore A As specified on drawing Type B As specified on drawing/
10、math data file Shore A As specified on drawing Elongation at Break Type A ISO 37, Type 4 dumb-bell, 200 20 mm/minute % 250 minimum Type B As specified on drawing/math data file % As specified on drawing Age Resistance (Heat Aging) Type A ISO 188 Method B,72 -2 h at +100 3 C Change in Hardness Shore
11、A 5 maximum Type B As specified on 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 % 25 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
12、, 20% strain, 72 -2 h visual examination 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 Bending test r=2,5 mm No cracks Type B As specified on drawing/math data file MPa As specified on drawing Abrasion Re
13、sistance Type A GMW3283-3 on complete part but 10 1 N load, 500 cycles cm As specified on drawing Type B 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, r
14、ules, 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 material specification
15、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. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWID
16、E ENGINEERING STANDARDS GMW14742 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 3 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
17、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 relea
18、se 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 b
19、y 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
20、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 requirem
21、ents. 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
22、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 (e.g., MATSPC) under this standard number have been qualified by Engineering as meeting the requirements of this standard.
23、 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. GHS Globally Harmonized System MATSPC Global repository of GM Approved Materials fo
24、r corresponding GM Engineering Standards. MSDS Material Safety Data Sheet SDS Safety Data Sheet 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW14742, Type “X“: Where X = material type as defined in Section 1.1. 9 Release and Revision
25、s 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 Five year refresh. (Global Elastomers Team). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
