1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW14725 Elastomer for Sealing Between Pipe Fuel Filler and Body Panel Copyright 2012 General Motors Company All Rights Reserved February 2012 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This standard covers
2、 the materials and performance of elastomeric sealing between the fuel filler pipe and the cut-out in the body panel. 1.1 Material Description. Materials covered by this standard are divided into three types: 1.1.1 Type A: Chlorinated Polyethylene (CM). 1.1.2 Type B: Nitrile Rubber (Acrylonitrile Bu
3、tadiene Copolymer (NBR). 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 the latest approved standards are applicable unless otherwise specifie
4、d. 2.1 External Standards/Specifications. ASTM D2000 ISO 188 ISO 1817 ISO 7619-1 IEC 60093 ISO 815 ISO 3865 SAE J200 ISO 37 ISO 1431-1 2.2 GM Standards/Specifications. GMW3059 GMW14162 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1
5、. 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 stated, mechanical properties in d
6、elivery state and after heat or fluid immersion are to be tested at +23 C and with the same test methods. 3.2 Conditioning. Conditioning shall be as specified in the relevant test method. 3.3 Equipment. Conforming to the relevant test methods. 3.4 Calibration. The test facilities and equipment shall
7、 be in good working order and shall have a valid calibration label. 3.5 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. 3.6 Facilities.
8、 Conforming to the relevant test methods. 3.7 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. Copyright General Motors Company Provided by IHS under license with Gene
9、ral Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14725 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 2 of 4 3.8 Material and Performance Requirements. Material and performance req
10、uirements are summarized in Table 1. Table 1: Material and Performance Properties Property Test Method Unit Value Hardness Type A Hardness to ISO 7619-1 Shore A 65 5 Type B Hardness to ISO 7619-1 Shore A 60 5 Type C As specified on drawing/math data file Shore A As specified on drawing Elongation at
11、 Break Type A, B ISO 37, dumbbell test piece Type 4 % 250 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 h -2 h at +100 C 3 C Change in Hardness Shore A +15 maximum Type B ISO 188 Method B, 168 h -2 h at +70 C
12、3 C Change in Hardness Shore A +10 maximum Type C As specified on drawing/math data file Shore A As specified on drawing Ozone Resistance Type A ISO 1431-1, 50 pphm, 20% strain, 40 C 2 C, 72 h -2 h, Visual Examination - No cracks Type B ISO 1431-1, 50 pphm, 10% strain, 25 C 2 C, 72 h -2 h, Visual Ex
13、amination - No cracks Type C As specified on drawing/math data file - As specified on drawing Fuel Resistance Type A ISO 1817 to Liquid 2; 48 h -2 h; +23 C 5 C Test piece thickness 1 mm 0.1 mm Change of Volume (15 minutes after removal) Change of Hardness (15 minutes after removal) Change of Hardnes
14、s after storage in air for 48 h at +23 C Ozone Resistance after storage in air for 48 h at +23 C % Shore A Shore A +50 maximum -15 to +2 -5 to +15 No cracks Type B ISO 1817 to Liquid 2; 48 h -2 h; +23 C 5 C Test piece thickness 1 mm 0.1 mm Change of Volume (15 minutes after removal) Change of Hardne
15、ss (15 minutes after removal) Change of Hardness after storage in air for 48 h at +23 C % Shore A Shore A +50 maximum -20 to +2 -5 to +15 Type C As specified on drawing/math data file % As specified on drawing Compression Set Type A ISO 815 test piece Type B +70 C 3 C, 24 h -2 h, 25% compressed % 25
16、 maximum Type B ISO 815 test piece Type B +70 C 3 C, 24 h -2 h, 25% compressed % 30 maximum Type C As specified on drawing/math data file % As specified on drawing Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking pe
17、rmitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14725 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 3 of 4 Property Test Method Unit Value Paint Staining Types A and B Paint Staining to ISO 3865, Method A; Ultraviolet (UV) Exposure to GMW1416
18、2/B/2 MJ/m minimum - Contact stain permissible, No migration stain Type C As specified on drawing/math data file - As specified on drawing Volume Resistivity Types A and B Volume Resistance to IEC 60093 Test voltage 500 V 107 maximum Type C As specified on drawing/math data file - As specified on dr
19、awing 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All 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
20、 language shall take precedence. 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 specification and approved by the responsible Engineering department prior to commencement o
21、f 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 required for initial release must be completed. It is the responsibility of the supplie
22、r 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 release tests shall be repeated and documented by the supplier prior to commencement of deli
23、very 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 by any supplier until representative initial production samples have been approved by th
24、e 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 chemical composition of an existing product has occurred, a complete copy of the Materi
25、al 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 requirements. In addition, product MSDS/SDS submissions must be in compliance with specific cou
26、ntry 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 Reportable Substances for Parts. 6 Approved Sources Engineering qualifications of an ap
27、proved source are required for this standard. Only sources listed in the GM Materials File under this 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
28、source in that individual country. 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 GMW14725 Copyright 2012 General Motors Company All Rights
29、 Reserved February 2012 Page 4 of 4 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. Ohms CM Chlorinated Polyethylene GHS Globally Harmonized System of Classification and Labeling of Chemicals MSDS Material Safety Data Sheet NBR Nitrile Rubber (Acrylonitrile butadiene
30、copolymer) SDS Safety Data Sheet UV Ultraviolet 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW14725 Type X Where: X = Material type as defined in Section 1.1 9 Release and Revisions This standard was originated in October 2005. It w
31、as 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 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-,-,-
