1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15023 O-Rings Quick Fittings for Vacuum Brake System Copyright 2012 General Motors Company All Rights Reserved September 2012 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This specification covers the mate
2、rials and performance of elastomeric o-rings used for tightening quick fittings of vacuum brake system. 1.1 Material Description. Materials covered by this specification are divided into three types: 1.1.1 Type A: Fluorocarbon Rubber (FKM) Color code: black. 1.1.2 Type B: Fluorosilicone Rubber (FVMQ
3、) Color code: blue. 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 specified. 2.
4、1 External Standards/Specifications. ASTM D2000 ISO 188 ISO 1817 ISO 37 ISO 815 ISO 23529 ISO 48 ISO 1431-1 SAE J200 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 Samp
5、les. Unless otherwise specified, the shape, size and number of test pieces shall be in accordance with the relevant test method. 3.1.1.1 Unless otherwise specified, samples are finished parts or to be taken from finished parts. If not otherwise stated, mechanical properties in delivery state and aft
6、er heat or fluid immersion are to be tested at +23 C and with the same test method. 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 worki
7、ng 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 to its physical definition. 3.1.6 Facilities. Conforming t
8、o the relevant test method. 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. Copyright General Motors Company Provided by IHS under license with General Mot
9、ors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15023 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 2 of 4 3.2 Material and Performance Requirements. Material and performance requireme
10、nts are summarized in Table 1. Table 1: Material and Performance Properties Property Test Method Unit Value Hardness Type A ISO 48 Method M (measured on cross section) IRHD As specified on drawing Type B ISO 48 Method M (measured on cross section) IRHD As specified on drawing Type C As specified on
11、drawing/math data file Shore A As specified on drawing Elongation at Break Type A and B ISO 37, on complete o-ring 500 mm/minute 50 mm/minute % 150 minimum Type C As specified on drawing/math data file % As specified on drawing Tensile Strength Type A ISO 37, on complete o-ring 500 mm/minute 50 mm/m
12、inute MPa 7.5 minimum Type B ISO 37, on complete o-ring 500 mm/minute 50 mm/minute MPa 5 minimum Type C As specified on drawing/math data file % As specified on drawing Age Resistance (Heat Aging) Type A and B ISO 188 Method B, 168 h -2 h at +150 C 3 C Change in Hardness IRHD + 10 maximum Type C As
13、specified on drawing/math data file As specified on drawing Fuel Resistance Type A and B ISO 1817, Liquid 2, 48 h - 2 h at +23 C 5 C whole o-ring Change of volume (15 minutes after removal) bending test after storage in air for 48 h - 2 h at +23 C 5 C until opposite points meet % + 30 maximum No cra
14、cks Type C As specified on drawing/math data file % As specified on drawing Compression Set Type A and B ISO 815, on complete o-ring 150 C 3 C, 24 h - 2 h, 25% compressed % 20 maximum Type C As specified on drawing/math data file % As specified on drawing Ozone Resistance Type A and B ISO 1431-1, 50
15、 pphm, 20%, 40 C 2 C, visual examination (no magnification) No cracks Type C As specified on drawing/math data file As specified on drawing Cold Resistance Type A ISO 23529, -20 C 3 C; 5 h - 0.2 h Bending test until opposite parts meet No cracks Type B ISO 23529, -40 C 3 C; 5 h - 0.2 h Bending test
16、until opposite parts meet No cracks Type C As specified on drawing/math data file As specified on drawing 4 Manufacturing Process Not applicable. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without li
17、cense from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15023 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 3 of 4 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendations valid in the country o
18、f 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 shall be tested for conformity with the requirements of this
19、 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, manufacturing process, location of manufacture, etc. If not otherwise agreed, all testing and document
20、ation 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 all modifications of materials and/or processes and to apply for a new release. If not otherwise ag
21、reed, 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 the responsible Engineering department and the supplier. 5.4 Material Safety Data Sheets/Safety Dat
22、a 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 Harmonized System of Classification and Labeling of Ch
23、emicals (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 available. 5.5 All materials supplied to this
24、standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Materials supplied to this specification must be approved by General Motors. A list of approved materials can be found in MATSPC. This GM Material File is provided to third parti
25、es to reduce redundant testing of materials. If approved material already listed is used, the part supplier can use GM Material File reference for Production Part Approval Process (PPAP) material approval. If the decision is made to use a not yet approved material, contact the Elastomers Global Subs
26、ystem Leadership Team for detail on the approval process. The material approval process must be completed prior to PPAP start date of the part supplied to General Motors. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms
27、, Abbreviations, and Symbols. ASTM ASTM International FKM Fluorocarbon Rubber FVMQ Fluorosilicone Rubber GHS Globally Harmonized System of Classification and Labeling of Chemicals IRHD International Rubber Hardness Degree Mpa Megapascal MSDS Material Safety Data Sheet PPAP Production Part Approval P
28、rocess Pphm Parts per Hundred Million SAE SAE International SDS Safety Data Sheet 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 GMW15023 C
29、opyright 2012 General Motors Company All Rights Reserved September 2012 Page 4 of 4 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW15023 Type “X“, where X = material type as defined in Section 1.1. 9 Release and Revisions This standa
30、rd was originated in January 2006. It was first approved by the Global Elastomer Team in May 2006. It was first published in August 2007. Issue Publication Date Description (Organization) 1 AUG 2007 Initial publication. 2 SEP 2012 5 Year Refresh. (Elastomers Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
