1、 GMDAT ENGINEERING STANDARDS Material Specification Paints EDS-M-8778 3C1B TOP Coat - Pearl Mica 3C1B - Pearl Mica Copyright 2010 General Motors Company All Rights Reserved September 2010 Originating Department: GMDAT Engineering Standards Page 1 of 12 Version : 3 1 Scope Note: Nothing in this stand
2、ard supersedes applicable laws and regulations. Note: In the event of conflict between the Korean and English language, the Korean language shall take precedence. 1.1 Material Description 1.1.1 Pearl mica colors of 3C1B top coat consists of color base coating (resin: polyester or acrylic) for color
3、pigment, mica base coating (resin: polyester or acrylic) for pearl mica, pearl clear coating (mixture paints of pearl mica and clear) for gloss and pearl mica, and clear coat coating for gloss. Pearl mica colors of 3C1B top coat permit automatic application by the electrostatic BELL machine and manu
4、al application with a general air spray gun. 1.1.2 Each coating that builds 3C1B film shall be secured for compatibility between layers of wet film and between layers of dry film. 1.2 Symbols. Not applicable. 1.3 Typical Applications. This specification specifies the general requirements of color ba
5、se coating, mica base coating, pearl clear coating and clear coat coating of pearl mica color of 3C1B top coat. 1.4 Remarks. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/S
6、pecifications. EDS-M-0102 EDS-M-7304 EDS-M-8304 EDS-M-8521 EDS-M-8773 EDS-M-8728 EDS-M-8776 EDS-T-7902 EDS-T-7907 EDS-T-7909 EDS-M-8314 EDS-M-8616 EDS-M-8716 EDS-M-8766 EDS-T-7006 EDS-T-7906 EDS-T-7908 EDS-T-7910 1 : . : , . 1.1 1.1.1 3C1B Pearl Mica Color Color Base ( : Polyester Acrylic), Pearl Mi
7、ca Mica Base ( : Polyester Acrylic), Pearl Mica Pearl Clear (Pearl Mica Clear ), Clear Coat , Air Spray Gun . 1.1.2 3C1B Wet Dry . 1.2 . . 1.3 . 3C1B Pearl Mica Color Color Base , Mica Base , Pearl Clear Clear Coat . 1.4 . . 2 / : . 2.1 / . 2.2 GM / . EDS-M-0102 EDS-M-7304 EDS-M-8304 EDS-M-8521 EDS-
8、M-8773 EDS-M-8728 EDS-M-8776 EDS-T-7902 EDS-T-7907 EDS-T-7909 EDS-M-8314 EDS-M-8616 EDS-M-8716 EDS-M-8766 EDS-T-7006 EDS-T-7906 EDS-T-7908 EDS-T-7910 GMDAT ENGINEERING STANDARDS EDS-M-8778 Copyright 2010 General Motors Company All Rights Reserved September 2010 Page 2 of 12Version : 3 EDS-T-7912 EDS
9、-T-7919 EDS-T-7921 EDS-T-7937 EDS-T-7948 EDS-T-7955 EDS-T-7963 EDS-T-7970 EDS-T-7976 GMW3001 EDS-T-7913 EDS-T-7920 EDS-T-7930 EDS-T-7945 EDS-T-7951 EDS-T-7958 EDS-T-7965 EDS-T-7974 EDS-T-7979 GMW3059 2.3 Additional References. None 3 Requirements 3.1 Test Conditions. 3.1.1 Standard Conditions of Tes
10、t Place. 3.1.1.1 The test shall basically be conducted at temperature of (20 2) and relative humidity of (65 5)%. 3.1.1.2 When the above conditions cannot be met, temperature and relative humidity shall be entered on the test report. 3.2 Material Condition of Test Piece. The test piece shall basical
11、ly be the finished vehicle built to the determined coating spec, but the one built of the same material to the same spec may be used. 3.3 Requirements. 3.3.1 Properties of Delivered Material. 3.3.1.1 Delivery Viscosity (EDS-T-7908). 3.3.1.1.1 Ford cup #4 at 20 . 3.3.1.1.2 Specified value 2 sec. 3.3.
12、1.2 Specific Gravity (EDS-T-7965). 3.3.1.2.1 100cc Specific gravity cup, 20 . 3.3.1.2.2 Specified value 0.02. 3.3.1.3 Non-volatile (EDS-T-7937). 3.3.1.3.1 120 2 hours, Paint; approximately 2g. 3.3.1.3.2 Specified value 1.5 wt%. 3.3.1.4 Dilution Thinner. 3.3.1.4.1 Color base: EDS-M-8716. 3.3.1.4.2 Mi
13、ca base: EDS-M-8716. 3.3.1.4.3 Pearl clear: EDS-M-8728 3.3.1.4.4 Clear coat: EDS-M-8728 3.3.1.5 Electric Resistance (EDS-T-7913, Dilution viscosity in paragraph 3.3.2.2). 3.3.1.5.1 Color base: 500 4,000 . 3.3.1.5.2 Mica base: 500 3,000 . 3.3.1.5.3 Pearl clear: There shall conform to the relevant cle
14、ar coat specification (EDS-M-8776 or EDS-M-8777). EDS-T-7912 EDS-T-7919 EDS-T-7921 EDS-T-7937 EDS-T-7948 EDS-T-7955 EDS-T-7963 EDS-T-7970 EDS-T-7976 GMW3001 EDS-T-7913 EDS-T-7920 EDS-T-7930 EDS-T-7945 EDS-T-7951 EDS-T-7958 EDS-T-7965 EDS-T-7974 EDS-T-7979 GMW3059 2.3 / . 3 3.1 . 3.1.1 . 3.1.1.1 (20
15、2) , (65 5)% . 3.1.1.2 , . 3.2 . , . 3.3 . 3.3.1 . 3.3.1.1 (EDS-T-7908). 3.3.1.1.1 Ford Cup #4 at 20 . 3.3.1.1.2 2 sec. 3.3.1.2 (EDS-T-7965). 3.3.1.2.1 100cc , 20 . 3.3.1.2.2 0.02. 3.3.1.3 (EDS-T-7937). 3.3.1.3.1 120 2 , 2g. 3.3.1.3.2 1.5 wt%. 3.3.1.4 . 3.3.1.4.1 Color base: EDS-M-8716. 3.3.1.4.2 Mi
16、ca base: EDS-M-8716. 3.3.1.4.3 Pearl clear: EDS-M-8728 3.3.1.4.4 Clear coat: EDS-M-8728 3.3.1.5 (EDS-T-7913, (3.3.2.2 ) ). 3.3.1.5.1 Color base: 500 4,000 . 3.3.1.5.2 Mica base: 500 3,000 . 3.3.1.5.3 Pearl clear: Clear Coat . (EDS-M-8776 EDS-M-8777). GMDAT ENGINEERING STANDARDS EDS-M-8778 Copyright
17、2010 General Motors Company All Rights Reserved September 2010 Page 3 of 12Version : 3 3.3.1.5.4 Clear coat: There shall conform to the relevant clear coat specification (EDS-M-8776 or EDS-M-8777). 3.3.1.6 Storage Stability (EDS-T-7963, undiluted solution). 3.3.1.6.1 Check the paint condition after
18、exposure to 50 120 hours and subsequent exposure from room temperature to (20 2) . 3.3.1.6.2 After storage, the paint shall be free from gel and seeding. 3.3.1.6.3 The viscosity after storage increase compared to the viscosity before storage shall less than 20 Sec. 3.3.1.6.4 No abnormalities in work
19、ability and external appearance when coating with paints after storage. 3.3.1.6.5 But, Pearl clear and clear coat shall conform to the relevant clear coat specification (EDS-M-8776 or EDS-M-8777). 3.3.1.7 Dilution Stability. 3.3.1.7.1 Fill up the paint diluted (paragraph 3.3.2.2) with specified visc
20、osity into a mass cylinder capable of 500 , and expose it at a room temperature for 72hours under sealing, and examine the condition of paint, and record the state of precipitation. 3.3.1.7.2 Get the mass cylinder, that test is completed by paragraph 3.3.1.7.1, upside down and back up repeatedly for
21、 20 seconds for 10 times. After that, perform the sampling and coating on the upper area (250 ) and the lower area (250 ). There shall be no change in the appearances such as color and gloss between the upper and the lower area. 3.3.2 Material Condition at Coating. 3.3.2.1 Preparation of Steel for C
22、oating. 3.3.2.1.1 Phosphate film + EDS-M-8773 + EDS-M-8766. 3.3.2.1.2 Phosphate film + EDS-M-8773. 3.3.2.2 Dilution Viscosity (EDS-T-7908). 3.3.2.2.1 Ford cup #4 at 20 . 3.3.2.2.2 Add specified Dilution thinner (paragraph 3.3.1.4) to the undiluted paint, and dilute it to specified viscosity. 3.3.2.3
23、 Coating Method. 3.3.2.3.1 Coating method shall conform to the application plants process. 3.3.2.3.2 Manual application with a general air spray gun. 3.3.1.5.4 Clear coat: Clear Coat . (EDS-M-8776 EDS-M-8777). 3.3.1.6 (EDS-T-7963, ). 3.3.1.6.1 50 120 , (20 2) . 3.3.1.6.2 GEL SEEDG . 3.3.1.6.3 20 Sec
24、. . 3.3.1.6.4 , . 3.3.1.6.5 , Pearl Clear Clear Coat Clear Coat . (EDS-M-8776 EDS-M-8777). 3.3.1.7 . 3.3.1.7.1 (3.3.2.2 ) 500 500 72 . 3.3.1.7.2 3.3.1.7.1 20 Sec. 10 , (250 ) (250 ) Sampling ( ) . 3.3.2 . 3.3.2.1 . 3.3.2.1.1 + EDS-M-8773 + EDS-M-8766. 3.3.2.1.2 + EDS-M-8773. 3.3.2.2 (EDS-T-7908). 3.
25、3.2.2.1 Ford cup #4 at 20 . 3.3.2.2.2 (3.3.1.4 ) . 3.3.2.3 . 3.3.2.3.1 . 3.3.2.3.2 Air Spray Gun . GMDAT ENGINEERING STANDARDS EDS-M-8778 Copyright 2010 General Motors Company All Rights Reserved September 2010 Page 4 of 12Version : 3 3.3.2.4 Paint Film Composition of Test Piece. 3.3.2.4.1 Test piec
26、e A: Test piece of paragraph 3.3.2.1.1 + Top Coat (Color Base) (Mica Base) (Clear Coat). 3.3.2.4.2 Test piece B: Test piece of paragraph 3.3.2.1.2 + Top Coat (Color Base) (Pearl Clear). 3.3.2.5 Flash-Off Time. 3.3.2.5.1 Color base: Expose to flash off temperature and period condition of relevant pro
27、gress or expose at room temperature under similar condition, and then finish mica base or pearl clear with wet on wet. 3.3.2.5.2 Mica base: Expose to flash off temperature and period condition of relevant progress or expose at room temperature under similar condition, and then finish clear coat with
28、 wet on wet. 3.3.2.5.3 Pearl clear: Expose at room temperature for approximately 5 minutes, and then expose at 40 45 for approximately 8 minutes or at room temperature for approximately 15 minutes, and then bake it to baking condition. 3.3.2.5.4 Clear coat: Expose at 40 45 for approximately 8 minute
29、s or at room temperature for approximately 10 minutes, and then bake it to baking condition. 3.4 Baking Condition. 3.4.1 Dry Oven. Use electric oven of convection type. 3.4.2 Backing Temperature and Time. 135 20 minutes (effective time). 3.4.3 The baking time shall be based on the effective time fro
30、m the point that temperature of the test piece reaches backing time. 3.5 Requirements after Drying. 3.5.1 Requirements after Exposure to Room Temperature. 3.5.1.1 Appearance. There shall be no sign of defects such as sagging and crater on the coated surface, and no defects to impact with qualities.
31、3.5.1.2 Color. According to color specifications. 3.5.1.3 Film Thickness (EDS-T-7970). 3.5.1.3.1 Color base: 10 12 . 3.5.1.3.2 Mica base: 10 12 . 3.5.1.3.3 Pearl clear: 20 30 . 3.5.1.3.4 Clear coat: 4050 . 3.5.1.4 Hiding Power (EDS-T-7914). 3.5.1.4.1 The hiding power shall be measured only for color
32、 base paints. 3.3.2.4 Paint Film . 3.3.2.4.1 A: 3.3.2.1.1 + (Color Base) (Mica Base) (Clear Coat). 3.3.2.4.2 B: 3.3.2.1.2 + (Color Base) (Pearl Clear). 3.3.2.5 Flash-Off Time. 3.3.2.5.1 Color base: Flash Off , Mica Base Pearl Clear Wet On Wet . 3.3.2.5.2 Mica base: Flash Off , Clear Coat Wet On Wet
33、. 3.3.2.5.3 Pearl clear: 5 40 45 8 , 15 . 3.3.2.5.4 Clear coat: 40 45 8 , 10 . 3.4 . 3.4.1 . Convection Type oven . 3.4.2 . 135 20 ( ). 3.4.3 , . 3.5 . 3.5.1 . 3.5.1.1 . , . 3.5.1.2 . Color . 3.6.1.3 (EDS-T-7970). 3.5.1.3.1 Color base: 10 12 . 3.5.1.3.2 Mica base: 10 12 . 3.5.1.3.3 Pearl clear: 20 3
34、0 . 3.5.1.3.4 Clear coat: 4050 . 3.5.1.4 (EDS-T-7914). 3.5.1.4.1 Color Base . GMDAT ENGINEERING STANDARDS EDS-M-8778 Copyright 2010 General Motors Company All Rights Reserved September 2010 Page 5 of 12Version : 3 3.5.1.4.2 Hiding power with the black and white sheets: shall conform to the material
35、characteristics as long as it does not affect painting work in the line. 3.5.1.4.3 Practical hiding force: shall be more than 70% of the specified maximum film thickness on the paint film of electro coat and primer surfacer. 3.5.2 Requirements after Exposure to Room Temperature for 24 Hours. 3.5.2.1
36、 Distinction of Image / Gloss (EDS-T-7907). 3.5.2.1.1 ATI 1864 SQC S/N 620. 3.5.2.1.2 Distinction of image shall be more than 75 and gloss shall be more than 80, when measured under test piece condition A of paragraph 3.3.2.4. 3.5.2.1.3 Distinction of image shall be more than 70 and gloss shall be m
37、ore than 75, when measured under test piece condition B of paragraph 3.3.2.4. 3.5.2.2 Adhesion (EDS-T-7910). 3.5.2.2.1 Tape: 3M # 610. 3.5.2.2.2 Cutter: Use a cutter to JIS K 5400 or equivalent cutter (NT cutter A type is recommended). 3.5.2.2.3 Cutter angle: approximately 30. 3.5.2.2.4 Cross cut wi
38、dth: 2 mm. 3.5.2.2.5 Tape peel angle: approximately 90. 3.5.2.2.6 Adhesion under test piece condition A and B specified in paragraph 3.3.2.4 shall be GT-0. 3.5.2.3 Hardness (EDS-T-7948). 3.5.2.3.1 Pencil hardness: Measuring temperature (20 ). 3.5.2.3.2 Buch Holtz hardness: 30 seconds, measuring temp
39、erature (20 ). 3.5.2.3.3 Pencil hardness shall be more than HB, and Buch Holtz hardness shall be 77 under test piece condition A and B of paragraph 3.3.2.4. 3.5.2.3.4 If the result for Buch Holtz hardness shall not meet the requirement, there shall be decided by separate discussion. 3.5.2.4 Cupping
40、(EDS-T-7974). 3.5.2.4.1 Cupping Tester (Diameter of ball: 20 mm, Velocity of cupping: approximately 0.2mm/sec.). 3.5.2.4.2 Cupping shall be more than 4.0 mm, under test piece condition A and B of paragraph 3.3.2.4. 3.5.2.5 Bending (EDS-T-7912). 3.5.2.5.1 Conical Bending Tester (Diameter of conical c
41、orn: 9.5 40.5 mm, Length: 212 mm). 3.5.1.4.2 Black & White : line , . 3.5.1.4.3 : 70% . 3.5.2 24 . 3.5.2.1 (EDS-T-7907). 3.5.2.1.1 ATI 1864 SQC S/N 620. 3.5.2.1.2 3.3.2.4 A , 75 , 80 . 3.5.2.1.3 3.3.2.4 B , 70 , 75 . 3.5.2.2 (EDS-T-7910). 3.5.2.2.1 Tape: 3M # 610. 3.5.2.2.2 Cutter: JIS K 5400 Cutter
42、 (NT Cutter A ). 3.5.2.2.3 Cutter : 30. 3.5.2.2.4 Cross cut : 2 mm. 3.5.2.2.5 Tape peel : 90. 3.5.2.2.6 3.3.2.4 A B , GT-0 . 3.5.2.3 (EDS-T-7948). 3.5.2.3.1 : 20 . 3.5.2.3.2 Buch Holtz : 30sec, 20 . 3.5.2.3.3 3.3.2.4 A B , HB , Buch Holtz 77 . 3.5.2.3.4 Buch Holtz 77 . 3.5.2.4 (EDS-T-7974). 3.5.2.4.1 Cupping Tester (Ball : 20 mm, cupping : 0.2mm/sec.). 3.5.2.4.2 3.3.2.4 A B , 4.0 mm . 3.5.2.5 (EDS-T-7912). 3.5.2.5.1 Conical Bending Tester (Conical corn : 9.5 40.5 mm, : 212 mm). GMDAT ENGINEERING STANDARDS EDS-M-8778 Copyright 2010 General Motors Company All Right
