GMNA-GM7474M-1995.pdf
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1、m 9006379 0000755 474 1 GENERAL MOTORS ENGINEERING STANDARDS Materials and Processes - Plastics GLASS FIBER REINFORCED POLYESTER /BALSA WOOD COMPOSITE LAMINATE GM7474M 1 SCOPE. This specification covers the sandwich con- struction process and mechanical properties of the resulting laminate. 1.1 The
2、skin consists of a glass reinforced unsaturated polyester composite per GMP.UP.013. 1.2 1.3 2 The core consists of end grain balsa wood per GM276M. APPLICATIONS: Floor panels. REFERENCED STANDARDS. GMlOOOM GM276M GMP.UP.013 ASTM C297 SAE 5400 ASTM C273 ASTM C393 3 REQUIREMENTS. See Table 1. 3.1 REST
3、RICTED AND REPORTABLE CHEMICALS (GMIOOOM). By 1997 start of saleable vehicles, all materials supplied to this specification must comply with the require- ments listed in GMIOOOM, “Restricted and Reportable Chemicals.” 3.2 TEST PROCEDURES. Tests shall be conducted using the latest issue of the test m
4、ethods indicated. Suitable precau- tions should be taken to ensure that applicable safe limits are not exceeded when conducting test procedures, processes, and/ or handling the materials required by this specification. 3.2.1 Tests shall be conducted 40 h min after molding and immediately following a
5、 conditioning period of 24 h min 22 f 3C and 50 f 5% RH unless otherwise specified. All test- ing shall be done on unarmealed samples. 3.3 CONSTRUCTION REQUIREMENTS. 3.3.1 Cut and form end grain balsa wood core per GM276M. 3.3.2 Apply two layers of 2 oz. continuous strand glass mat to both sides of
6、the Balsa core forming a sandwich construc- tion. 3.3.4 The molding conditions will be determined by DOE then posted on the press as an SOP for the operator. The pro- cedure and critical molding conditions will be controlled via SPC techniques. 4 SOURCE SHIPMENT RESPONSIBILITY. It will be the respon
7、sibility of the supplier to insure that the material is not exposed to temperatures during shipment which would cause the material to fail to meet any of the requirements of this specification. 5 INITIAL SOURCE APPROVAL. No shipment shall be made by any supplier until representative initial producti
8、on samples have been approved by engineering as meeting the requirements of this specification. 5.1 Completed copies of the Material Safety Data Sheet meeting GM information requirements must be submitted with any new submissions or whenever a composition change has occurred. 6 INSPECTION AND REJECT
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