1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW14717 Elastomeric Ball Joint Boots Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This standard covers the requirements for elastomeric
2、ball joint boots, for service free ball and socket joints used in steering and suspension assemblies. 1.1 Material Description. Materials covered by this specification are divided into three types: 1.1.1 Type A. Polychloroprene (CR) with 5% by mass maximum. Nitrile Rubber (Acrylonitrile Butadiene Co
3、polymer (NBR); for normal use on passenger vehicles and light commercial vehicles. 1.1.2 Type B. Polyurethane (PU) Elastomer; for use in arduous conditions, such as heavy commercial vehicles. 1.1.3 Type C. Drawing defined (e.g., using SAE J200 or ASTM D2000 line callout). 1.2 Symbols. Not applicable
4、. 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 1817 ISO 48 ISO 2285 ISO 188 ISO 23529 ISO 868 SAE J200 2.
5、2 GM Standards/Specifications. GMW3059 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1.1 Resources. 3.1.1.1 Test Samples. Unless otherwise specified, the shape, size and number of test pieces shall be in accordance with the relevant
6、 Test Method. 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 shall
7、 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 working order and shall have a valid calibration label. 3.1.5 Alternatives. Alternative test facilities and equipment may also
8、be used. However, all measuring variables as specified in this standard shall be determined correctly with respect to its physical definition. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14717 Copyright 2011
9、General Motors Company All Rights Reserved October 2011 Page 2 of 4 3.1.6 Facilities. Conforming to the relevant Test Method. 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,
10、reports, etc. 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 48 Method M IRHD 55 5 Type B ISO 868 Shore A 85 5 Type C As specified on drawing/
11、math data file Shore A As specified on drawing Elongation at Break Types A, B ISO 37, Type 4 dumbbell, 200 20 mm/minute % 400 minimum Type C As specified on drawing/math data file % As specified on drawing Tensile Strength Type A ISO 37, Type 4 dumbbell, 200 20 mm/minute MPa 10 minimum Type B ISO 37
12、, Type 4 dumbbell, 200 20 mm/minute MPa 17.5 minimum Type C As specified on drawing/math data file MPa 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 5 maximum Type B ISO 188 Method B, 168 -2 h at 70 3 C Change in Hardness Shor
13、e A -10 to +5 Type C As specified on drawing/math data file N/mm As specified on drawing Grease Resistance Types A, B ISO 1817, Grease see drawing, 168 -2 h at 70 3 C Change in Hardness Change of Volume Ozone Resistance to ISO 1431-1, 50 pphm, 20% strain on mandrel, 40 2 C, 72 -2 h, Visual examinati
14、on IRHD/Shore A % 5 15 No cracks Type C As specified on drawing/math data file As specified on drawing Cold Resistance Types A, B ISO 23529, 22 +2 h at -40 3 C Test piece: strip cut through boot 10 mm wide, bent 180 around a mandrel, radius of 2.5 mm No cracks Type C As specified on drawing/math dat
15、a file As specified on drawing Tension Set Type A ISO 2285 test piece in the shape of ring, 50 5% strain, 24 -2 h, 100 3 C, followed by cooling in strained condition for 2 -0.2 h at 23 5 C % 40 maximum Type B ISO 2285 test piece in the shape of ring, 50 5% strain, 24 -2 h, 70 3 C, followed by coolin
16、g in strained condition for 2 -0.2 h at 23 5 C. % 90 maximum Type C As specified on drawing/math data file As specified on drawing Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14717 Copyright 2011 General Moto
17、rs Company All Rights Reserved October 2011 Page 3 of 4 Property Test Method Unit Value Hydrolysis Resistance Type B ISO 1817, deionized water, 168 -2 h at 70 3 C Change in Tensile Strength % -40 maximum Type C As specified on drawing/math data file As Specified on drawing 4 Manufacturing Process No
18、t 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 language shall take precedence.
19、 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 of delivery of bulk supplies. A n
20、ew 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 supplier to inform the customer in a ti
21、mely 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 delivery of non-conforming bulk supp
22、lies. 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 the appropriate Materials Engineer
23、ing 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 Material Safety Data Sheet/Safety Data
24、 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 country General Motors TMC003 Mater
25、ial 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 approved source are required for t
26、his 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. For other GM locations, the responsible Engineering group should be contacted to obtain the approved source in that in
27、dividual country. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM Approved Materials for corresponding GM Engineering Standards. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14717 Copyright 2011 General
28、Motors Company All Rights Reserved October 2011 Page 4 of 4 7.2 Acronyms, Abbreviations, and Symbols. CR Polychloroprene GHS Globally Harmonized System IRHD International Rubber Hardness Degree MSDS Material Safety Data Sheets NBR Nitrile Rubber (Acrylonitrile butadiene copolymer) PPHM Parts per Hun
29、dred Million PU Polyurethane SDS Safety Data Sheet 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW14717 Type “X” Where: X = Material type as defined in Section 1.1. 9 Release and Revisions This standard was originated in October 2005
30、. 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 SEP 2011 5 Year Refresh. Time for Ozone Resistance added. (Global Elastomers Team) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
