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1、 ENGINEERING STANDARDS Material Specification General 9986185 Low MDI Urethane Foam, Prepolymer Copyright 2005 General Motors Corporation All Rights Reserved August 2005 Originating Department: North American Engineering Standards Page 1 of 2 1 Scope This specification covers the chemical and physic
2、al requirements of the prepolymer component of a two part polyurethane foam. 1.1 Material Description. 1.1.1 The acoustical polyurethane foam system is comprised of a 24:1 mixture (by volume) of an amine/water curative (9986184) and an isocyanate prepolymer (9986185). The mixture of 9986184 and 9986
3、185 is identified as 9986183. 1.1.2 The structural polyurethane foam system is comprised of a 4:1 mixture (by volume) of prepolymer (9986185) and amine/polyol surfactant mixture (9986241). The mixture of 9986185 and 9986241 is identified as 9986242. 2 References Note: Only the latest approved standa
4、rds are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D92 ASTM D2196 ASTM D1638 2.2 GM Standards/Specifications. 9986183 GM9763P 9986184 GMW3001 9986241 GMW3059 9986242 3 Requirements 3.1 Requirements on Delivery. The isocyanate prepolymer must be homogeneous and
5、 free of lumps, unmixed particles and foreign materials. 3.1.1 Chemical Requirements. Not applicable. 3.1.2 Mechanical Requirements. 3.1.2.1 Stability, GM9763P. Store in airtight containers away from heat and sunlight. 3.1.2.2 Elevated Temperature. As shipped, the material must be capable of withsta
6、nding temperature range of 55C for 72 h. 3.1.2.3 Low Temperature. As shipped, the material must be capable of withstanding three cycles of the applicable cycle schedule outlined in A2 of GM9763P. 3.1.2.4 Storage. The shelf life of the material in closed containers shall be 90 days at a temperature n
7、ot to exceed 35C. Shelf life of the material commences upon the receipt of the material from the manufacturer. 3.1.3 Physical Requirements. 3.1.3.1 Color. The two components, polyol curative and isocyanate hardener shall be in contrasting colors. The colors shall be so picked that in instances of im
8、proper mixing, color striations shall be visible in the dispensed bead. 3.1.3.1.1 Material Properties. See Table 1. Table 1: Material Properties Properties Test Values Test Methods Viscosity (at 25C) 3500 cps ASTM D2196 Appearance Brown liquid Flash Point 230F ASTM D92 Shelf Life 3 months min Specif
9、ic Gravity1.05 to 1.15 ASTM D1638 Odor Slight 3.1.3.2 Viscosity. The viscosity of the iso- cyanate pre-polymer should be tested at 25C and at the process condition according to ASTM D2196. 4 Manufacturing Process Manufacturing equipment must be approved prior to implementing this product into an ass
10、embly plant. 5 Rules and Regulations 5.1 All materials supplied to this specification must comply with the requirements of GMW3001, Rules and Regulations for Material Specifications. 5.2 All materials supplied to this specification must comply with the requirements of GMW3059, Copyright General Moto
11、rs North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 20:54:02 MDTNo reproduction or networking permitted without license from IHS -,-,- 9986185 GM ENGINEERING STANDARDS Copyright 2005 General Motors Corporation All Right
12、s Reserved Page 2 of 2 August 2005 Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualifications of an approved source is required for this specification. Only sources listed in the GM Materials File (i.e., MATSPC) under this specification number have been qualified b
13、y engineering as meeting the requirements of this specification. 7 Coding System This material specification shall be referenced in other documents, drawings, VTS, CTS, etc. as follows: Material per 9986185 8 Release and Revisions 8.1 Release. This standard originated in May 1999. It was first appro
14、ved and published in August 2000. 8.2 Revisions. Rev Approval Date Description (Organization) A AUG 2005Title edit; Addition of Viscosity; re-write of Material Description (Section 1.1); (Foam Specialist) Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 20:54:02 MDTNo reproduction or networking permitted without license from IHS -,-,-