GMNA-9984103-1990.pdf
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1、_ 9006379 0004493 321 I 13 - 25 (18) 38 - 51 (43) 20 - 41 (30) 38 - 51 (43) I I GENERAL MOTORS ENGINEERING STANDARDS Materials and Processes - Paint I 8 - 18 (13) 18 - 38 (25) IS - 36 (20) 15 - 30 (20) ENAMEL, HIGH SOLIDS - RIGID BASECOAT/RIGID CLEARCOAT SYSTEM 9984103 1 SCOPE. This specification co
2、vers the performance and qualification requirements for rigid exterior solventborne high solids basecoat/claucoat enamel systems. Typid volume soiids as sprayed are 45 to 50% for the basemat and 54 to 60% for the clearcoat. 1.1 Basecoats and clear coats approved under this specifica- tion are classu
3、ied as rigid and can be used only on rigid or semirigid substrates. Ucarcoats may be used with other basecoats as well and arc covered as components under specification 9984472. The basecoat/cicarcoat enamel is part of the total paint system which must meet Corporate goals for appearance and durabil
4、ity. 2 REFERENCED STANDARDS. GM4350M GM4364M GM4367M GM9508P 9984460 9984472 ASTM D1186 3 REQUIREMENTS. Materials submitted for qualifica- tion to t h i s specification must meet ail the material, pafor- mance, processability requirements of GM4367M. only key requirements, exceptions or requirements
5、 specific to this type of basecaat/clcarcoat system are noted. herein. Once qualified to these requirements, routine testing of parts is covered by specification GM4350M. 3.1 F i l m Thickness (ASTM D1186). The coating must meet ail specified appearance and durability requirements within the frlm bu
6、ild ranges shown in Table 1. The categories of normal and weak hiding colors are guidelines oniy. The actual acceptable range for a color or specific pigmentation will be dictated by appearance and hiding capabiiity utab- lished during the workability phase of Annual Color testing. TABLE 1 - FILM TH
7、ICKNESS RANGE (TARGET), Cun Coating N o d Hiding Colon Weak Hiding Colors Basecoat Clearcoat Basecoat clearcoat DurribJAppear. Durab./Appear. I (Zones - A3.0 I (Zones D B Appuuancc zones are specified in GM4364M. Exceptions to these film builds on specific car lines must be reevaluated for durabilit
8、y. Maximum F i l m Build for TweTones and R e p a i r s . Apply the minimum amount of film build required for hiding and leveling. Total topcoat f i l m build must not exceed 225 p n unless otherwise authorized for a specific technology. 3.2 Gravelometer (GM9508P. Method A ) . Minimum rating shaii b
9、c 6 for no& film builds and bakes and 5 for all other conditions of bakes and fh within the bake latitude charts provided by supplier. This include in-line and nai-line repalls and associated bakes, and maximum tota millowable film thickness per 3.1. 3.3 Annual Color Testing (GM9620P). After qualifi
10、cation of basecoat/clearcoat technologies to this specification based on representative colors, all new colors or pigmentation changes must be tested per Annual color test procedures as established by GM engineering groups. New colors must meet ail matcriai, performance and processability requiremen
11、ts herein prior to production tryout. 3.4 Processability Requirements. Clearcoats covered under this specification are intended to be applied wet-on-wet over the bastcoat. Clcarmat must not be appiied over aked basecoat unicss the approved matcriai has ben specuically evaluated and approved for this
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