1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW14746 Elastomeric Membrane - Brake Booster Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This specification covers the materials and pe
2、rformance of elastomeric membranes for brake boosters. 1.1 Material Description. Materials covered by this specification are divided into three types: 1.1.1 Type A. Styrene Butadiene Rubber (SBR), continuous operating temperature limit = 100 C. 1.1.2 Type B. Ethylene Propylene Diene Terpolymer (EPDM
3、) continuous operating temperature limit = 125 C. 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
4、unless otherwise specified. 2.1 External Standards/Specifications. ASTM D2000 ISO 1431-1 ISO 34-1 ISO 1817 ISO 37 ISO 23529 ISO 48 SAE J200 ISO 188 2.2 GM Standards/Specifications. GMW3059 GMW3356 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requ
5、irements 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 relevant Test Method. Unless otherwise specified, samples are finished parts or to be taken from finished parts. If not otherwise stated, mechanical prope
6、rties 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 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
7、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 be used. However, all measuring variables as specified in this specification shall be determined correctly with respect to its physical definition
8、. 3.1.6 Facilities. Conforming to 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. 3.2 Material and Performance Requirements. Mate
9、rial and performance requirements are summarized in Table 1. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14746 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 2 of 4 Table 1: Mater
10、ial and Performance Properties Property Test Method Unit Value Hardness Types A and B ISO 48 Method M IRHD 65 +5/-10 Type C As specified on drawing/math data file Shore A As specified on drawing Elongation at Break Types A and B ISO 37, Type 4 dumbbell, 200 20 mm/minute % 300 minimum Type C As speci
11、fied on drawing/math data file % As specified on drawing Tensile Strength Types A and B ISO 37, Type 4 dumbbell, 200 20 mm/minute MPa 15 minimum Type C As specified on drawing/math data file MPa As specified on drawing Tensile Modulus at 100% Elongation Types A and B ISO 37, Type 4 dumbbell, 200 20
12、mm/minute MPa 1.5 minimum Type C As specified on drawing/math data file MPa As specified on drawing Tear Strength Types A and B Tear strength to ISO 34-1 Method A (trouser test piece) N/mm 4 minimum Type C As specified on drawing/math data file N/mm As specified on drawing Age Resistance (Heat Aging
13、) Type A ISO 188 Method B, 168 -2 h at +100 3 C Change in Hardness Change in Elongation at Break Change in Tensile Strength Change in Tear Strength Tensile Modulus at 100% Elongation IRHD % % % MPa +10 maximum -40 maximum -30 maximum -40 maximum 3 minimum Type B ISO 188 Method B, 168 -2 h at +125 3
14、C Change in Hardness Change in Elongation at Break Change in Tensile Strength Change in Tear Strength Tensile Modulus at 100% Elongation IRHD % % % MPa +10 maximum -50 maximum -35 maximum -50 maximum 3 minimum Type C As specified on drawing/math data file As specified on drawing Resistance to Brake
15、Fluid Types A and B ISO 1817, to GMW3356, 125 3 C, 168 -2 h Change in Hardness Change in Elongation at Break Change in Tensile Strength Change of Volume IRHD % % % 5 -20 maximum -20 maximum 10 Type C As specified on drawing/math data file As specified on drawing Cold Resistance Types A and B ISO 235
16、29, -40 3 C, 22 +2 h, bending radius = 2 mm No cracks Type C As specified on drawing/math data file As specified on drawing Ozone Resistance Type B ISO 1431-1, 50 pphm, 20% strain, 40 2 C, 72 -2 h visual examination (no magnification) No cracks Type C As specified on drawing/math data file As specif
17、ied on drawing Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14746 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 4 4 Manufacturing Process Not applicable. 5 Rules and Regulati
18、ons 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. 5.3 Inspection and Rejection. Sam
19、ples 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 new approval must be received for a
20、ny 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 timely manner, without solicitation,
21、 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 supplies. In individual cases, a short
22、er 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 Engineering department(s) as meeting the r
23、equirements 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 Sheet must be submitted in compli
24、ance 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 Material Safety Data Sheet/Safety Data
25、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 this standard. Only sources listed
26、in the GM Materials File (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 individual country. 7 Notes 7.1 Glossary.
27、Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. EPDM Ethylene Propylene Diene Terpolymer GHS Globally Harmonized System IRHD International Rubber Hardness Degree MATSPC Global repository of GM Approved Materials for corresponding GM Engineering Standards MSDS Material Safety Data Sheets Pp
28、hm Parts per Hundred Million SBR Styrene Butadiene Rubber SDS Safety Data Sheets Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14746 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 4
29、 of 4 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW14746 Type “X“, where X = material type as defined in Section 1.1 9 Release and 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 5 Year Refresh (Global Elastomers Team) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
