1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW14723 Elastomer for Return Flood Gate 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 materials and performance
2、of elastomers on return flood gates (fuel fill check valves) for fuel tank assemblies. 1.1 Material Description. Materials covered by this specification are divided into two types: 1.1.1 Type A. Nitrile Rubber (Acrylonitrile butadiene copolymer NBR). 1.1.2 Type B. Drawing defined (e.g., using SAE J2
3、00 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、7619-1 SAE J200 2.2 GM Standards/Specifications. GMW3059 GMW14292 GMW3221 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Requirements on Test Specimens. Reference GMW3221. 3.1.1 General Requirements. 3.1.1.1 Test Samples. Unless ot
5、herwise specified, the shape, size and number of test 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 im
6、mersion are to be tested at +23C and with the same test methods. 3.1.2 Conditioning. Conditioning shall be as specified in the relevant test procedure. 3.1.3 Equipment. Conforming to the relevant test procedure. 3.1.4 Calibration. The test facilities and equipment shall be in good working order and
7、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 to its physical definition. 3.1.6 Facilities. Conforming to the relevan
8、t test procedure. 3.1.7 Deviations. Deviations 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-
9、GM WORLDWIDE ENGINEERING STANDARDS GMW14723 Copyright 2011 General Motors Company All Rights Reserved 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 M
10、ethod Unit Value Hardness Type A ISO 7619-1 Shore A 60 5 Type B As specified on drawing/math data file Shore A As specified on drawing Age Resistance (Heat Aging) Type A ISO 188 Method B, 168 -2 h at +70 3C Change in Hardness Shore A 10 maximum Type B As specified on drawing/math data file Shore A A
11、s specified on drawing Fuel Resistance Type A ISO 1817, Liquid 2, 48 - 2 h at +23 5C Test piece thickness 1 0.1 mm Change of volume (15 minutes after removal) Change of Hardness (15 minutes after removal) Change of Hardness after storage in air for 48 h at +23C % Shore A % 0 to +30 -15 to +2 -5 to +
12、15 Type B As specified on drawing/math data file As specified on drawing Determination of Deposits Type A GMW14292 Free from Deposits Type B As specified on drawing/math data file Shore A As specified on drawing 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. A
13、ll materials 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 materi
14、als 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
15、 manufacturing 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 documentatio
16、n of 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 bet
17、ween 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 specific
18、ation. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14723 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 3 5.5 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For n
19、ew 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 Classification and Labeling of Chemicals (GHS) requirements
20、 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. 5.6 All materials supplied to this standard must comply with
21、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 (i.e., GM Supply Power) under this standard number have been qualified by Engi
22、neering 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, Abbreviations and Symbols. GHS Globally Harmonized System
23、MSDS Material Safety Data Sheet NBR Nitrile Rubber Acrylonitrile Butadiene Copolymer SDS Safety Data Sheet 8 Coding System This standard shall be referenced in other documents, drawings, etc. as follows: Material per GMW14723 Type “X“, where X = material type as defined in Section 1.1 9 Release and
24、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 Five year refresh. (Global Elastomers Team) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
