1、 GMDAT ENGINEERING STANDARDS Material Specification Paints SUPERCEDED EDS-M-8777 Acid approximately 2g. 3.4.1.2.2 Specified value 1.5 wt%. 3.4.1.3 Dilution Thinner. EDS-M-8728. 3.4.1.4 Electric resistance (EDS-T-7913, based on diluted paint). 300 10,000 . 3.4.1.5 Specific Gravity (EDS-T-7965). 3.4.1
2、.5.1 100cc Specific gravity cup, 20 . 3.4.1.5.2 Specified value 0.02. 3.4.2 Material Condition at Coating. 3.4.2.1 Dilution Viscosity (EDS-T-7908). 3.4.2.1.1 Ford cup No. 4 at 20 . EDS-T-7937 EDS-T-7948 EDS-T-7955 EDS-T-7963 EDS-T-7970 EDS-T-7976 GMW3001 EDS-T-7945 EDS-T-7951 EDS-T-7958 EDS-T-7965 E
3、DS-T-7974 EDS-T-7979 GMW3059 2.3 / . 3 3.1 . 3.1.1 . 3.1.1.1 (20 2) , (65 5)% . 3.1.1.2 , . 3.2 . , . 3.3 . 3.3.1 135 20 ( ) . 3.3.2 , . 3.4 . 3.4.1 . 3.4.1.1 (EDS-T-7908). 3.4.1.1.1 Ford cup #4 at 20 . 3.4.1.1.2 2 sec. 3.4.1.2 (EDS-T-7937). 3.4.1.2.1 120 2 , 2g. 3.4.1.2.2 1.5 wt%. 3.4.1.3 . EDS-M-8
4、728. 3.4.1.4 (EDS-T-7913, ). 300 10,000 . 3.4.1.5 (EDS-T-7965). 3.4.1.5.1 100cc , 20 . 3.4.1.5.2 0.02. 3.4.2 . 3.4.2.1 (EDS-T-7908). 3.4.2.1.1 Ford cup No. 4 at 20 . GMDAT ENGINEERING STANDARDS EDS-M-8777 Copyright 2010 General Motors Company All Rights Reserved September 2010 Page 3 of 12Version :
5、4 3.4.2.1.2 Add EDS-M-8728 base thinner to the undiluted paint to adjust to specified viscosity at 20 . 3.4.2.2 Storage Stability under Undiluted Solution (EDS-T-7963). 3.4.2.2.1 Check the paint condition after exposure to chamber at 50 for normal hours and subsequent exposure from room temperature
6、to (20 2) . 3.4.2.2.2 Measure the storage status of paint (whether or not gelation and seeding of paint and increase of viscosity to compare with initial viscosity) for 24, 48, 72, 96, 120 hours by the 24 hours, and record it. 3.4.2.3 Dilution Stability. 3.4.2.3.1 Fill up the paint diluted with spec
7、ified viscosity into a mass cylinder capable of 500 , and expose it at a room temperature for 72 hours under sealing, and examine the condition of paint, and record the state of precipitation. 3.4.2.3.2 Get the mass cylinder upside down and back up repeatedly for 20 seconds for 10 times. After that,
8、 perform the sampling and coating on the upper area (250 ) and the lower area (250 ). There shall be no change in the appearances between the upper and the lower area. 3.4.2.4 Coating method. 3.4.2.4.1 Automatic application shall conform to the each plants process. 3.4.2.4.2 Manual application with
9、a general air spray gun. 3.4.2.5 Paint Film Composition of Steel for Top Coat. 3.4.2.5.1 Phosphate film + EDS-M-8773. 3.4.2.5.2 Phosphate film + EDS-M-8773 + Primer surfacer (EDS-M-8740 or EDS-M-8766). 3.4.2.5.3 Phosphate film + EDS-M-8773 + Primer surfacer (EDS-M-8740 or EDS-M-8766) + Top coat (Spe
10、cified Base coat + EDS-M-8777). 3.4.2.6 Flash-Off Time. 3.4.2.6.1 Base coat. shall conform to the relevant specification. 3.4.2.6.2 Clear coat. Expose to 40 45 for about 10 minutes or to room temperature for about 10 minutes. 3.4.2.7 Drying Method. Convection drying. 3.4.2.8 Drying Period and Temper
11、ature. Maintain 20 minutes (effective time) at (135 5) (based on body temperature). 3.4.2.9 Appearance after Drying. After drying, the coated surface shall show no sign of defects, such as sagging and pinholes. 3.4.2.1.2 EDS-M-8728 Clear Thinner 20 . 3.4.2.2 ( ) (EDS-T-7963). 3.4.2.2.1 50 Chamber 20
12、 2 . 3.4.2.2.2 24 ( Gel Seeding ) 24, 48, 72, 96, 120 . 3.4.2.3 . 3.4.2.3.1 500 72 . 3.4.2.3.2 20 10 (250 ) (250 ) Sampling . 3.4.2.4 . 3.4.2.4.1 . 3.4.2.4.2 Air Spray Gun . 3.4.2.5 . 3.4.2.5.1 +EDS-M-8773. 3.4.2.5.2 + EDS-M-8773 + (EDS-M-8740 EDS-M-8766). 3.4.2.5.3 + EDS-M-8773 + (EDS-M-8740 EDS-M-
13、8766) + ( Basecoat+EDS-M-8777). 3.4.2.6 Flash-Off Time. 3.4.2.6.1 Base coat. Basecoat . 3.4.2.6.2 Clear coat. 40 45 10 10 . 3.4.2.7 . Convection drying. 3.4.2.8 . Body 1355 20 . 3.4.2.9 . , . GMDAT ENGINEERING STANDARDS EDS-M-8777 Copyright 2010 General Motors Company All Rights Reserved September 2
14、010 Page 4 of 12Version : 4 3.5 Requirements after Drying. 3.5.1 Film Thickness (EDS-T-7970). 3.5.1.1 Base Coat. There shall conform to the relevant specification. 3.5.1.2 Clear Coat. 40 50 . 3.5.2 Paint Film Composition of Test Piece. 3.5.2.1 Condition A. Phosphate film + EDS-M-8773 + Relevant prim
15、er surfacer (EDS-M-8740 or EDS-M-8766) + Top coat (Specified Base coat + EDS-M-8777). 3.5.2.2 Condition B. Phosphate film + EDS-M-8773 + Relevant primer surfacer (EDS-M-8740 or EDS-M-8766) + Top coat (Specified Base coat + EDS-M-8777) + Re-coating top coat (Specified Base coat + EDS-M-8777). 3.5.3 R
16、equirements after Exposure to Room Temperature for 24 Hours. 3.5.3.1 Distinction of Image / Gloss (EDS-T-7907). 3.5.3.1.1 ATI 1864 SQC S/N 620. 3.5.3.1.2 Distinction of image shall be satisfied with the requirements of specified Base coat, when measured under test piece Condition A with an angle of
17、20. 3.5.3.2 Adhesion (EDS-T-7910). 3.5.3.2.1 Tape: 3M #610. 3.5.3.2.2 Cutter: Use a cutter to JIS K 5400 or equivalent cutter (NT cutter A type is recommended). 3.5.3.2.3 Tape peel angle: 90. 3.5.3.2.4 Cutter angle: approximately 30. 3.5.3.2.5 Adhesion (Width: 2 mm) under test piece condition A shal
18、l be GT-0. 3.5.3.3 Hardness (EDS-T-7948). 3.5.3.3.1 Pencil hardness: There shall be shall be more than HB under test piece Condition A. 3.5.3.3.2 Buch Holtz hardness (30sec. measuring temperature (20 ): There shall be 77 under test piece condition A. (If the result for Buch Holtz hardness shall not
19、meet the requirement, there shall be decided by separate discussion.). 3.5.3.4 Cupping (EDS-T-7974). 3.5.3.4.1 Cupping tester. 3.5.3.4.2 Diameter of ball: 20mm, Velocity of ball: approximately 0.2mm/sec. 3.5.3.4.3 Cupping under test piece Condition A shall be more than 4.0 mm. 3.5.3.5 Bending (EDS-T
20、-7912). 3.5.3.5.1 Conical bending tester. 3.5.3.5.2 Diameter of conical corn: 9.5 40.5 mm, Length: 212 mm. 3.5 . 3.5.1 (EDS-T-7970). 3.5.1.1 Base Coat. Base coat . 3.5.1.2 Clear Coat. 40 50 . 3.5.2 Paint Film . 3.5.2.1 A. + EDS-M-8773 + (EDS-M-8740 EDS-M-8766) + ( Basecoat+ EDS-M-8777). 3.5.2.2 B. +
21、 EDS-M-8773 + (EDS-M-8740 EDS-M-8766) + ( Basecoat+ EDS-M-8777) + ( Basecoat+ EDS-M-8777). 3.5.3 24 . 3.5.3.1 / (EDS-T-7907). 3.5.3.1.1 ATI 1864 SQC S/N 620. 3.5.3.1.2 A 20 Base coat . 3.5.3.2 (EDS-T-7910). 3.5.3.2.1 Tape: 3M #610. 3.5.3.2.2 Cutter: JIS K 5400 Cutter (NT Cutter A ). 3.5.3.2.3 Tape P
22、eel : 90. 3.5.3.2.4 Cutter : 30. 3.5.3.2.5 A ( : 2 mm) GT-0 . 3.5.3.3 (EDS-T-7948). 3.5.3.3.1 : A HB . 3.5.3.3.2 Buch Holtz (30sec, 20 ): A 77 . ( Buch Holtz 77 .) 3.5.3.4 (EDS-T-7974). 3.5.3.4.1 Cupping tester. 3.5.3.4.2 Ball : 20 mm, Ball : 0.2 mm/sec. 3.5.3.4.3 A 4.0 mm . 3.5.3.5 (EDS-T-7912). 3.
23、5.3.5.1 Conical bending tester. 3.5.3.5.2 Corn : 9.5 40.5 mm, : 212 mm. GMDAT ENGINEERING STANDARDS EDS-M-8777 Copyright 2010 General Motors Company All Rights Reserved September 2010 Page 5 of 12Version : 4 3.5.3.5.3 Perform bending for 15 seconds by 180 of angle at an even velocity. 3.5.3.5.4 When
24、 tested under test piece Condition A, there shall be no sign of surface defects, such as cracks and peeling-off. 3.5.3.6 Overbaking (EDS-T-7919). 3.5.3.6.1 135 20 minutes (effective time) 3 cycles (initial drying excluded). 3.5.3.6.2 Under test piece Condition A, there shall be no abnormalities in t
25、he film surface such as blistering, peeling-off, discoloration, etc. 3.5.3.6.3 Adhesion (Width: 2 mm) shall be GT-0 after exposure to room temperature for 24 hours. 3.5.4 Requirements after Exposure to Room Temperature for 72 Hours. 3.5.4.1 Humidity Resistance (EDS-T-7951). 3.5.4.1.1 Test condition:
26、 40 3 , 98%RH min. 3.5.4.1.2 After test under test piece Condition A for 240 hours, there shall be no abnormalities in the film surface such as blistering, peeling-off, discoloration, etc. Blistering can be disregarded if it is minor and disappears after exposure to room temperature for 24 hours. 3.
27、5.4.1.3 After exposure to room temperature for 24 hours, adhesion shall be less than GT-1. 3.5.4.2 Gasoline Resistance (EDS-T-7909). 3.5.4.2.1 Unleaded gasoline (for commerce). 3.5.4.2.2 Use a 7 14 (1 2 sec/drop) of gasoline for 7 minutes. The test piece shall be set at 30 from the horizon. 3.5.4.2.
28、3 After exposure to room temperature for 24 hours immediately following test under test piece Condition A, there shall be no changes on the surface and shall be less than Rating 2. 3.5.4.3 Oil Resistance (EDS-T-7930). 3.5.4.3.1 Humidity resistance chamber at 40 3 , more than 98%RH for 48 hours. 3.5.
29、4.3.2 Under test piece Condition A, there shall be Rating 0. 3.5.4.4 Acid Resistance (EDS-T-7920). 3.5.4.4.1 Spot method. 3.5.4.4.2 pH 1.0 sulfuric acid solution, 0.2cc drop, for 30 minutes. 3.5.4.4.3 Under test piece Condition A, M.S.T (Minimum Spot Temperature) shall be more than 55 , the acid sca
30、le value shall be more than 0.80. 3.5.4.5 Scratch Resistance (EDS-T-7979). 3.5.4.5.1 Under test piece Condition A, the gloss holding rate shall be more than 80% after 10 reciprocating cycles in car washing brush test device. 3.5.3.5.3 180 15 Bending . 3.5.3.5.4 A , . 3.5.3.6 Overbaking (EDS-T-7919).
31、 3.5.3.6.1 1355 20 ( ) 3 ( ). 3.5.3.6.2 A ( , , ) . 3.5.3.6.3 24 ( : 2 mm) GT-0 . 3.5.4 72 . 3.5.4.1 (EDS-T-7951). 3.5.4.1.1 : 40 3 , 98%RH . 3.5.4.1.2 A 240 ( , , ) . , 24 . 3.5.4.1.3 24 GT-1 . 3.5.4.2 (EDS-T-7909). 3.5.4.2.1 ( ). 3.5.4.2.2 7 7 14 (1 2 sec/drop) , 30 . 3.5.4.2.3 A Test 24 Rating 2
32、. 3.5.4.3 (EDS-T-7930). 3.5.4.3.1 40 3 , 98%RH Chamber 48 . 3.5.4.3.2 A Rating 0 . 3.5.4.4 (EDS-T-7920). 3.5.4.4.1 Spot . 3.5.4.4.2 pH 1.0 Soln , 0.2 Drop, 30 . 3.5.4.4.3 A M.S.T(Minimum Spot Temperature) 55 , The Acid Scale Value 0.80 . 3.5.4.5 (EDS-T-7979). 3.5.4.5.1 A Brush Test 10 80% . GMDAT EN
33、GINEERING STANDARDS EDS-M-8777 Copyright 2010 General Motors Company All Rights Reserved September 2010 Page 6 of 12Version : 4 3.5.4.5.2 Under test piece Condition A, the gloss holding rate shall be more than 60%, and gloss reduction rate shall be more than 90% after long-term scratch testing. 3.5.
34、4.5.3 Rubbing scratch (dry &/ wet) test: To be reported sedately. 3.5.4.6 Alkali resistance (EDS-T-7955). 3.5.4.6.1 Immerse a test piece in 0.1N NaOH at a room temperature for 7 hours. 3.5.4.6.2 Under test piece condition A, there shall be Rating 0. 3.5.4.7 Anti-chipping (EDS-T-7945). 3.5.4.7.1 Grav
35、el Meter (Air pressure: 4 0.5Bar). 3.5.4.7.2 Gravel: JIS #7, 50g. 3.5.4.7.3 Test temperature: Normal and cold (-20 ). 3.5.4.7.4 Under test piece Condition A, there shall be more than Rating 6. 3.5.4.7.5 After test under EDS-M-8740, more than Rating 6, and EDS-M-8766, more than Rating 8 shall be ensu
36、red. 3.5.4.8 Cold / Hot Cycle Stability (EDS-T-7958). 3.5.4.8.1 Test piece: Under test piece condition A and 3 times of re-painting with Non-sanding. 3.5.4.8.2 (80 10 minutes) (-40) 10 minutes) (20 10 minutes) as 1 cycle, conduct a total of 20 cycles. 3.5.4.8.3 After 20 cycles, the film surface shal
37、l show no sign of abnormality, such as crack and chalking etc. 3.5.4.8.4 Adhesion (Width: 2 mm) shall be less than GT-1 after exposure to room temperature for 24 hours. 3.5.4.9 W-O-M (EDS-T-7976). 3.5.4.9.1 Xenon light. 3.5.4.9.2 Black panel temperature: 63 max. 3.5.4.9.3 After elapse of 3,000 hours
38、 under test piece condition A, and foreign matters on the film are removed by light polishing. The surface shall show no signs of discoloration, swell, cracks and blushing etc. and the gloss-retaining ratio shall be more than 80%. Light polishing means that test piece is lightly cleaned by a cloth c
39、overed with #7000 compounds. 3.5.4.9.4 Adhesion shall be less than GT-1 after termination of testing and exposure to a room temperature for 24 hours. 3.5.4.10 Q.U.V (EDS-T-7921). 3.5.4.10.1 Condition C (8 hours UV at 60 , 4 hours condensation at 40 ). 3.5.4.5.2 A Test 60% , 90% . 3.5.4.5.3 Rubbing s
40、cratch (dry &/ wet) test: . 3.5.4.6 ALKAI (EDS-T-7955). 3.5.4.6.1 0.1N NaOH 7 . 3.5.4.6.2 A Rating 0 . 3.5.4.7 Chipping (EDS-T-7945). 3.5.4.7.1 Gavelo Meter ( : 40.5 Bar). 3.5.4.7.2 : JIS 7 , 50g. 3.5.4.7.3 : (-20 ). 3.5.4.7.4 A Rating 6 . 3.5.4.7.5 , M-8740 Rating 6, M-8766 Rating 8 . 3.5.4.8 (EDS-
41、T-7958). 3.5.4.8.1 A 3 Non-sanding . 3.5.4.8.2 (80 10 ) (-40) 10 ) (20 10 ): 1 Cycle 20 Cycle . 3.5.4.8.3 20 Cycle Crack, Chalking . 3.5.4.8.4 24 ( : 2 mm) GT-1 . 3.5.4.9 W-O-M (EDS-T-7976). 3.5.4.9.1 Xenon light. 3.5.4.9.2 Black panel temperature: 63 max. 3.5.4.9.3 A 3000 , Polishing , , , , 80% .
42、Polishing #7000 Compound . 3.5.4.9.4 Test 24 GT-1 . 3.5.4.10 Q.U.V (EDS-T-7921). 3.5.4.10.1 C (8 UV at 60 , 4 Condensation at 40 ). GMDAT ENGINEERING STANDARDS EDS-M-8777 Copyright 2010 General Motors Company All Rights Reserved September 2010 Page 7 of 12Version : 4 3.5.4.10.2 After elapse of 3,000 hours under test piece condition A, and foreign matters on the film are
