GMNA-9984858-1995.pdf
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1、I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I TOPCOAT - FLEXIBLE ENAMEL, WATERBORNE BASECOATISOLVENT-BORNE CLEARCOAT 9984858 1 SCOPE. This specification covers the qualification and performance requirements for flexible, exterior, one-compo- nent, waterborne basecoat/sol
2、vent borne clearcoat topcoats for use over plastic substrates. 1.1 Basecoat components of these systems are waterborne technologies and are identified by 9984434 plus the individual WAXXXX color codes. 1.2 Clearcoat components of these systems are solvent borne technologies identified by 99845 11. 1
3、.3 Each combination of specific basecoat and clearcoat must be tested and approved as a basecoaticlearcoat system. The individual components are not interchangeable. In addition, the topcoat system is part of the total system and must meet quali- fications set forth in this specification and shown o
4、n engineering drawings. 2 REFERENCED STANDARDS. GMlOOOM GM4495M 9984511 GM4367M GM4496M 9984801 GM4493M GM9620M ASTM D1186 GM4494M 9984434 3 REQUIREMENTS. 3.1 RESTRICTED AND REPORTABLE CHEMICALS (GMlOOOM). By 1997 start of saleable vehicles, all materials supplied to this specification must comply w
5、ith the require- ments listed in GMlOOOM, “Restricted and Reportable Chemicals.” 3.2 Materials approved to this specification must meet all of the minimum requirements of GM4367M, Class 3, Type D. 3.3 SUBMISSION INFORMATION REQUIREMENTS (GM4493M). Chart 1 of this specification must be completed prio
6、r to approval of the product. 3.4 PANEL PREPARATION. Panels are to be prepared per GM4494M for lype D materials. Note that powerwashing per 9984801 is required. 3.5 COMPATIBILITY. Compatibility with associated materi- als are evaluated per GM4495M for the respective type of usage. 3.6 PROCESSABILITY
7、. Processability must be demon- strated per GM4496M. 3.7 FILM THICKNESS (ASTM D1186). The coating must meet all specified appearance and durability requirements within the general film build ranges as indicated in Table 1. Individual colors may have narrower ranges for optimum appearance. Individual
8、 colors may also have higher minimum film builds than the technology minimum due to hiding or ultraviolet opacity. The acceptable range for a color or specific pigmentation will be established during the annual “Pigmenta- tion Evaluation” (GM9620M). and will be approved and released by NAO Paint Eng
9、ineering. 3.7.1 Film Build Latitude. The specific clearcoat film build range must be established by a Designed Experiment or a matrix ranging from 1.0 to 2.5 mils. Performance criteria are xenon, Florida, flex, adhesion, chip. 3.7.2 Film build requirements for Zone D or any deviations to Zones A - C
10、 will be specified on individual part drawings. TABLE 1 - FILM BUILD REQUIREMENTS RANGE Zones A,B,C, Zones A,B,C, (ill hlld 3.8 BARE. Products that are approved to this specification have a typical bake range of 116 to 135 C (240 to 275 F). Flash is typically 1 to 2 minutes between coats of basecoat
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