1、 ENGINEERING STANDARDS Test Procedure SUPERCEDED EDS-T-7701 Determination of Resistance to Stone Impact of Surface Coatings, Plastics and Self Adhesive Film This standard may be applied only for current projects. It is Superceded for all future projects and replaced by GMW14700. Stone Impact 4G - No
2、te: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program .Bd# GMW14700 ) $4=F7 957F$ . Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: GM Korea Engineering Standards Page 1 of 6 Version : 5 1 Scope Note: Nothing in this standard supersedes applicable laws and reg
3、ulations. Note: In the event of conflict between the Korean and English language, the Korean language shall take precedence. 1.1 Purpose and Applicability. The purpose of this standard is to determine the degrees of damage to the sample surface caused by bombardment of the organic coating material,
4、plastics and self adhesive films with rough gravel at room temperature and at low temperature. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. SAE J400 2.2 GM Standards/Specifications. None 2.3 Additional Referen
5、ces. None 3 Resources 3.1 Equipment. 3.1.1 Humidity Chamber for conditioning. 3.1.2 Gravelometer (Maker: Q-PANEL, Model: QGR). 3.1.3 Gravel (8 to 12 mm Mesh, Weighting: max 7 g). 3.1.4 Low Chamber operating at (-25) E . 3.1.5 Self Adhesive Tape (The laminate adhesive strength of the tape shall be (1
6、0r1) N/mm, when 180 peeling off, at a speed of 200 mm/minute). 1 P7 :0 : ., E:48 6&F !7$ :4-8! 9I8x $4=F 3L 6$ . :0 : F67t 7568 18 88x 7 , F6* 72T8p) F$ . 1.1 +95 -C 957 -88 . ., 4G -8 +958t 17 D# 94772P 8TdD98 , F(3D% , 9E=2e Fx* E+8x 807 38%P E:48x 957F$ . 2.1 17 E:4 / . SAE J400 2.2 GM E:4 / . No
7、ne 2.3 dA E:4 / . None 3 4G 88 3.1 4G 8/x . 3.1.1 98=* 88F Humidity Chamber. 3.1.2 Gravelometer (Maker: Q-Panel, Model: QGR). 3.1.3 4G 7 82F 3P 818 4G D8x 4G F$ . 3.2.5 F(3D% 4D8 7 , 98=*7t 4G 8t 9P9 G 2 7248 0 G FF$ . 4 4G 98 H958t F7%L! D9?i8 -I* 68x . 9 Very good A maximum of 2 chips penetrating
8、to the primer or to the substrate. / F8(8+l D# 2:?i7 2P 8F8 8 F7 . 8 Good All chipping penetration to the primer coat only. / F8(8+l E+72P+8 -I* . 2 mm max. diameter. / $4 : 2 mm 8F . 7 Satisfactory All chipping penetration to the primer coat only. / F8(8+l E+72P+8 8 . 90 % min. 2 mm diameter. 10 %
9、max. 2, 3 mm diameter. / : 2 mm 8F , 90 % 81 , 2 mm $4 : 2 mm 8F . To the substrates: 1 mm max. diameter and 5 chips max. / 2: : $4 : 1 mm 5P 8F . 5 Mediocre All chipping penetration to the primer coat only. / F8(8+l E+72P+8 -I* . 10 % min. 2, 3 mm diameter. / $4 : 2 mm $4 : 1 mm 5P 8F . All chippin
10、g penetration to the substrate. / 2:72P+8 -I* . 1 mm max. diameter and 5 chips min. / $4 : 1 mm 8F 5P $4 : 3 mm 81 , 4 mm 8F . 2 Bad Chipping penetration to primer coat or substrate. / F8(8+l D# 2:72P8 -I* . To the primer coat: 6 mm Diameter. / F8(8+l : $4: 4 mm $4 : 1 mm $4 : 6 mm $4 : 2 mm ) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 5 OCT 2011 Apply new Engineering Standard Template. Superceded (Polymer / Organic Material Lab Team) / 4 d3TE:4 64 957 . F9I957 =* (G)8*4G D4 )
