GMNA-9984271-1995.pdf
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1、- 9006379 0004839 B7L I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I UV ABRASION RESISTANT COATINGS FaR LIGHTING APPLICATIONS 9984271 1 SCOPE. This specification covers the requirements for a clear UV cured hardcoat to be used on exterior applications. The coatings in thi
2、s specification are for protective purposes on plastics. 1.1 These UV cured coatings are part of a total painted prod- uct system and must meet the requirements set forth in this specification and those shown on engineering drawings. This specification shall be used in conjunction with the Approved
3、Paint on Plastics Systems (APOPS). a section of Materials Specification File (MATSPC) which listed approved substrate, cleaning, priming, and topcoat combinations. REFERENCED STANDARDS. GMlOOOM GM4466P GM4298P GM9071P GM4348M GM9125P GM435OM GM9163P GM4389M GM9504P GM4465P GM9505P GM9508P GM9509P GM
4、9515P SAE J576C REQUIREMENTS. 3.1 RESTRICTED AND REPORTABLE CHEMICALS (GMlOOOM). By 1997 start of saleable vehicles, all materials supplied to this specification must comply with the require- ments listed in GMlOOOM, “Restricted and Reportable Chemicals.” 3.2 SURFACE PREPARATION. The substrate must
5、be clean and free of surface defects which would affect photometric performance or appearance. 3.3 APPLICATION. Reduce and apply uniformly to achieve dry film thickness that will meet material and process specifi- cations when used over clear lenses, pad print inks, or paints for decorative and blac
6、kout purposes. 3.4 CURE. Cure with ultraviolet radiation with a wattage specified by supplier. The hardcoat must be properly cured as determined by the cure test specified per GM9509P. 3.5 APPEARANCE. Must present a uniform appearance, and be free of visual or physical defects that would aestheti- c
7、ally or photometrically cause the coated part to fail and must meet the applicable requirements of GM4348M as shown in Table 1. Paragraoh I TABLE 1 Title I Comments 1 1 scope ! 3 1 Appearance Zone A 1 5 1 Orange Peel Zone A 1 With a min ratine of 6.2 6.3 No craters in Zone A 8, must be accepkble to
8、customer DirtinZoneA 6.5 6.6 Gverspray in Zone A Pinholing/Popping in 7me A 6.8 INoSaesinZoneA 1 3.6 PERFORMANCE. Coated lens must meet GM4465P with no evidence of blistering or other appearance changes at the end of 96 h followed by GM9071P with a minimum of 99% retention. Coated lens tested to GM9
9、508P with a mini- mum rating of 7. 3.7 APPROVAL. For coatings to be initially approved per this specification an extended production run must be made to confii process, appearance, cost, and quality control. When testing is satisfactorily completed per the above requirements, approval to this specif
10、ication will be given. The abrasion resis- tant coatings per this specification must be evaluated and approved for each specific lamp design. 4 SOURCE SHIPMENT RESPONSIBILITY. It will be the responsibility of the supplier to insure that the material is not exposed to temperatures during shipment whi
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