1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16849 Polyurethane, Dense Molded, Adhesive Coated Copyright 2012 General Motors Company All Rights Reserved September 2012 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This standard defines the requirement
2、s for a dense molded polyurethane material having high resiliency, high coefficient of friction, and a pressure sensitive adhesive (PSA) coating on one side. These materials are typically used as spacers. 1.1 Material Description. The material shall be dense molded polyurethane with an acrylic press
3、ure sensitive adhesive coating on one side. These materials are available in the following types. 1.1.1. Type I. Thirty (30) to forty (40) durometer molded or cast-to thickness roll stock foamed urethane with an acrylic based PSA. 1.1.2 Type II. Sixty (60) to eighty (80) durometer molded or cast to
4、thickness roll stock urethane with an acrylic based PSA. The color of the material shall be specified on the part drawing. Black is typically used. The material types are available in brown, clear, or a custom color match. Parts will be molded or cast to thickness and die-cut to obtain the desired s
5、ize and contour. Solid urethane roll stock is available in thicknesses up to 3.5 mm. Foamed urethane roll stock is available up to 6.5 mm. Molded urethane is available up to 25.4 mm. One surface of the molded or die cut part shall be covered evenly and completely with a pressure sensitive adhesive.
6、The adhesive shall be protected with a release liner, which can be readily removed without any detrimental effects 1.1.2.1 Limitations on Usage. This material is not suitable for use in applications with exposure to brake fluid or engine coolant, or with exposure to temperatures in excess of 105 C i
7、ntermittent and 65 C continuous, or with exposure to ultraviolet (UV). 1.2 Symbols. Not applicable. 1.3 Typical Applications. Typical application is spacers. 1.4 Remarks. The classification into types is according to different ranges of durometer. 2 References Note: Only the latest approved standard
8、s are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 37 ISO 815 ISO 868 2.2 GM Standards/Specifications. GMW3059 GMW14093 GMW14729 GMW3221 GMW14124 2.3 Additional References. BASF Basecoat per R98/R99. BASF Clearcoat per E10CG060S. TMC003 Material Safety Data Sheet
9、 guidance documents (available at ). 3 Requirements 3.1 Requirements on Test Specimens. Reference GMW3221. All samples are to be conditioned prior to each requirement test to GMW3221, Code A. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo r
10、eproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16849 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 2 of 4 3.2 Test Preparation. Testing is done according to the ISO laboratory procedures. Samples shall be properl
11、y identified, where appropriate, with the molding method, direction of grain, and conditions of the curing process. Limited testing may also be run on finished parts. Slabs representing a minimum of three (3) production lots must be submitted for source approval. 3.3 Physical property and adhesion r
12、equirements are listed in Table 1. Table 1: Requirements Test Type I Type II 1. Original Properties Durometer, (ISO 868, 15 second delay), Type A, points 35 5 70 10 2. Oven Aging, 70 hours at 70 C Durometer Change, points, maximum 5 5 Flexibility: Tensile dumbell (per ISO 37, Type I) shall be wrappe
13、d 180 around a 25 mm mandrel. No cracks or breaks No cracks or breaks 3. Compression Set, 22 hours at 70 C, (ISO 815, Type A), %, maximum 35 35 4. Cold Flexibility, Tensile dumbbell (per ISO 37, Type I) that has been at -40 C for 70 hours shall be wrapped 180 degrees around a 25 mm mandrel that has
14、been cooled to -40 C for at least 5 hours. No cracks or breaks No cracks or breaks 5. Hydrolytic Stability, 168 hours at 70 C and 100% relative humidity (RH). Durometer Change, %, maximum -25 -30 6. Adhesion Requirements, Finished parts shall be bonded to production representative substrate. Samples
15、 shall be fixtured to represent in-car position. (If a production substrate is not known, then test on BASF R98/R99 base coat, E10CG060S clear coat for North America and other regions to select their common paint system.) Edge Adhesion After 168 hours at 70 C. After 168 hours condensing humidity per
16、 GMW14729. After three (3) cycles of GMW14124, cycle W. During and after all exposures, the edges of the dense molded sample must be securely bonded. There shall be no signs of lift or separation from the bond to substrate. Impact Test. (GMW14093 apparatus C). As received Within 60 seconds after com
17、pletion of the second cold cycle in GMW14124, cycle W, three (3) cycles, a total of three (3) impacts. Must withstand 1.7 Joules when reverse impacted. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulation
18、s 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. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction o
19、r networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16849 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 3 of 4 5.3 Inspection and Rejection. Samples of components or materials released to a GM material specification shall be teste
20、d 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, manufacturing process, location of manufacture, etc. If
21、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 documentation of all modifications of materials and/or processes and t
22、o 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 between the responsible Engineering department and the suppli
23、er. 5.4 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 compliance with the Globally Harmoniz
24、ed 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 Sheet guidance documents where
25、available. 5.5 All materials supplied to this 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. The appropriate GM Materials Engineering department(s)
26、must confirm material as meeting the requirements of this specification. Any test data sheets of material submitted to General Motors for such confirmation (e.g., during Production Part Approval Process (PPAP) under this material specification must list all properties and must apply corresponding te
27、st methods of this material specification. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM Approved Materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. GHS Globally Harmonized System of Classification and Labeling of Chemicals MSDS Material Safety Da
28、ta Sheet PPAP Production Part Approval Process PSA Pressure Sensitive Adhesive RH Relative humidity SDS Safety Data Sheet UV Ultraviolet 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16849, Type Z Z = I or II per 1.1 Example: Polyur
29、ethane, dense molded, adhesive coated per GMW16849, Type I 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 GMW16849 Copyright 2012 General M
30、otors Company All Rights Reserved September 2012 Page 4 of 4 9 Release and Revisions This standard was originated in August 2012. It was first approved by the Adhesives Global Subsystem Leadership Team in September 2012. It was first published in September 2012. Issue Publication Date Description (Organization) 1 SEP 2012 Initial publication. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
