GMNA-9984543-1997.pdf
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1、VND.GM 998q5LI3-ENGL I,997 - 90Clb379 llllll7b=lA Ill-4 m 1 GENERAL MOTORS ENGINEERING STANDARDS 1 Materials and Processes - Paint I BLACKOUT/ACCENT TOPCOAT, COSMETIC 9984543 1 SCOPE. This specification covers the qualification requirements for cosmetic blackout/accent topcoats. These coatings are n
2、onweatherable and have limited application in areas that have minimal performance requirements. They are specialty products for specific vehicles and may not be submit- ted for other nonweatherable blackouts that have additional requirements for performance or processing. 2s E8BZ 1 .s ” g 1.1 Produc
3、ts covered under this specification are restricted to f $3 Zone D appearance areas or Zone C areas that do not have ssrb -2Et exposure to UV or stone chipping. (Appearance Zones are .r ekkB defined in GM4364M and GM4348M.) They are classified per 2;zcs zs=ze GM4367M as Type 5 for durability and I&z
4、C or E for usage. ,gsi)on a&E* 4.e -T BBEa 8, u cm 1.2 The coating is intended for use on metal or plastic sub- 1 c 7 g $ zggw* strates which have been cleaned and primed per appropriate d 8 Wd? GM specifications. Application may also be over topcoat over- % s 2 2 .s 00 0s spray* dBZQb$ w erfc 2 REF
5、ERENCED STANDARDS. GMlOOOM GM4367M GM4348M GM4389M GM4350M GM4493 GM4364M GM4496M GM9533P 9984094 3 REQUIREMENTS. Materials submitted for qualifica- tion to this specification must comply with the requirements listed below for performance and information. 3.1 RESTRICTED AND REPORTABLE CHEMICALS (GMl
6、OOOM). All materials supplied to this specification must comply with the requirements listed in GMlOOOM, Restricted and Reportable Chemicals.” 3.2 SUBMISSION REQUIREMENTS. Prior to test initia- tion, a submission letter must be provided to the responsible engineer that includes ah data required in C
7、hart 1 of GM4493. 3.3 PANEL PREPARATION. For test purposes, ail blackouts are to be applied over steel panels primed with 9984094 elec- trocoat. In addition, blackouts intended for use on metal, rigid plastic or flexible plastic parts must be evaluated over the spe- cific combination of substrate, c
8、leaning process, and primer intended for use. 3.3.1 Film Build The supplier must establish the optimum film build range for each technology. This range must be within a lower limit of 0.5 miIs and an upper limit of 2.0 mils. 3.3.2 Bake. The supplier must establish the optimum bake window for each te
9、chnology. Air dry systems must be tack- free for handling within a maximum of 30 minutes 18C (65 F). Bake systems must be designed for optimum cure between 20 minutes 121 “C (250F) and 30 minutes 130C (265F). Testing must be done at upper and lower extremes for each technology to determine the windo
10、w. The supplier must establish a drying time chart for air dry systems relating time, temperature, and humidity. A cure chart must be established for baked products. These charts must show the bake (air dry) processing window wherein all performance requirements are met. A bake chart that has been s
11、igned by NAO Paint Engineering is the only acceptable document allowed in either an assembly plant or Tier 1 or Tier 2 suppli- ers to GM. 3.3.3 Appearance. Requirements per GM4364M or GM4348M Zone C and D must be met. Typical gloss is 30 on a 60 meter. High gloss is 80 on an 20” meter. Color and glo
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