1、 ENGINEERING STANDARDS Test Procedure LIMITED USE EDS-T-7745 Resistance of Organic Coatings to Dime Scratch Do Not Use on New Program; No Replacement. 8TdD9 9PE8 % 985H2e 4G - Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program 72P# 957%L: 6#$ . Copyright 2011 General Motors Company All Rights Reserved
2、 August 2011 Originating Department: GM Korea Engineering Standards Page 1 of 3 Version : 4 1 Scope Note: Nothing in this standard 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 Purpos
3、e. This standard specifies the test method to measure adhesion and brittleness of the organically coated surface. 1.2 Applicability. This test method applies to measuring adhesion and brittleness of the organically coated (painted) surface to rigid or semi-rigid plastic substrates by using a dime. 2
4、 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Test Piece. 3.1.1 Test pieces may be taken from wherever top coat is made
5、and shall be tested at least 72 hours later after painting. 3.1.2 For initial sample approval and arbitration purposes, at least 3 test pieces and for routine quality control, at least 1 test piece shall be tested. 3.1.3 The size of test piece shall be (150B 100B 1) mm. 1 P7 :0 : ., E:48 6&F !7$ :4-
6、8! 9I8x $4=F 3L 6$ . :0 : F67t 7568 18 88x 7 , F6* 72T8p) F$ . 1.1 +95 . ., E:48t 8TdD9+8 9E=)Y0 ?2e (Brittleness)8 9I$* ?U9IFd 88F 4G -7 $4F7 9IF 8$ . 1.2 957 -88 . ., 4G -8t Rigid D# Semi-RigidF F(3D% 2:7 D9%P 8TdD9 ($8 )+8 9E=)Y0 ?2e (Brittleness)8x % 98 (Dime)8x 17 ?U9IF# $ 957%P$ . 2 4) E:4 / :
7、0 : C-H +d%P 9I8 6# F 48 07 38%P E:48x 957F$ . 2.1 17 E:4 / . None 2.2 GM E:4 / . None 2.3 dA E:4 / . None 3 4G 88 3.1 4G D . 3.1.1 4G D8t 1$ D9%P 6# 72P! =x?4#F+ $8 G 7248 8G7 4G F$ . 3.1.2 2F 3 P8 4G D8 Fx7F+ 9Id958 E:4* 4G 8x 88F2P# 2F 1P8 4G D8 Fx7F$ . 3.1.3 4G D Size# (150B 100B 1) mm) F$ . GM
8、KOREA ENGINEERING STANDARDS EDS-T-7745 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 2 of 3 Version : 4 4 Procedures 4.1 Conditions. 4.1.1 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified
9、 on component drawings, test certificates, reports, etc. 4.2 Instructions. 4.2.1 Initial Condition. Using a dime, held as shown in Figure 1, scrape with pressure over area to be tested. Dime should be 45 degrees from horizontal in the direction of the scraping motion. 4 4G 9) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 4 AUG 2011 Apply new Engineering Standard Template. Limited use with no replacement (Polymer / Organic Material Lab Team) / 4 d3TE:4 64 957 . F9I957 ($4=E:4 68 ) =* (G)8*4G D4 )
