1、 ENGINEERING STANDARDS Test Procedure LIMITED USE EDS-T-7523 Test Method for the Pencil Hardness of Plastics Do Not Use on New Program; No Replacement. F(3D% E:4 4G D8 7$Fx $ 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、October 2011 Originating Department: GM Korea Engineering Standards Page 1 of 6 Version : 3 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 and Applicability. This test standard describes the test method for pencil hardness to evaluate scratch resistance on film coated and non-coated plastics to be applied to both interior and exterior. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.
4、1 External Standards/Specifications. JIS S6006 2.2 GM Standards/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Equipment. 3.1.1 Structure. Figure 1 shows an implement structure that consists of each part described in 3.1.1.1 3.1.1.4. 3.1.1.1 Pencil. The pencil used for the test
5、 must be a high grade one that conforms to JIS S 6006 (Pencil), and officially approved. 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 8t 8% = ! 78 .E7 957%L# $* -C /x$* 16 F(3D% 8*8 !3A (?2e (Scratch Resistance)8x D4Fd 88F 7$F
6、x$ (Pencil Hardness) 4G -7 4F7 9IF$ . 2 4) E:4 / :0 : C-H +d%P 9I8 6# F 48 07 38%P E:48x 957F$ . 2.1 17 E:4 / . JIS S6006 2.2 GM E:4 / . None 2.3 dA E:4 / . None 3 4G 88 3.1 4G 8/x . 3.1.1 9 . ,* 1 7 E4F 9) 3.1.1.1 3.1.1.48 5 .8p) 8*6 :$ . 3.1.1.1 7$Fx . JIS S6006 (7$Fx )7 9IF E:)4 % 47 )d48 9I8x Fx
7、F 7$Fx8x 17F$ . GM KOREA ENGINEERING STANDARDS EDS-T-7523 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 2 of 6 Version : 3 Figure 1: Pencil Hardness Tester / ,* 1: 7$Fx$ 4G d 3.1.1.2 Pencil Holder. Figure 2 shows that the pencil holder is perpendicular to the weight bas
8、e (on each plain part). When a pencil for the test is fixed in place, the end of the pencil lead is almost aligned with the centerline of the weight base. It should be placed at an angle of (451). 3.1.1.2 7$Fx Gt$ . ,* 27 E4F 9) Gt$# -O?$47t 3L:8p) +!+ (5 .8 D+ . ), 7$Fx8x ?. F8x & 7$Fx4 8 + !8t -O?
9、$4 :E4 2T0 8 8?F , 5$# (451) 8 . Figure 2: Pencil Holder / ,* 2: 7$Fx Gt$ 3.1.1.3 Weight and Weight Base. Figure 3 shows that the weight is a structure of (100050) g and is put on the center position of its base. 3.1.1.3 -C -O?$4 . ,* 37 E4F 9) # (100050) g8p) F -O?$4# 1000 g8 * -O?$48 :E4 7 68x 3L
10、8# 8p) F$ . GM KOREA ENGINEERING STANDARDS EDS-T-7523 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 6 Version : 3 Figure 3: Weight Base / ,* 3: -O?$4 3.1.1.4 Test Sample Mount. Figure 4 shows the structure and dimensions of the test sample mount. You can adjust the
11、 mount by turning the adjusting wheel that is set up on the side of the main base. You can move the mount each 25 mm or longer to both sides from the pencil point in the way that the mount plate slides forward and backward along BB. When your turn the wheel to adjust the mount position along the adj
12、usting screw aligned with AA, the mount slides each 15 mm or longer to both sides from the pencil point along AA, horizontally perpendicular to the direction of the pencil lead. And you can randomly fix the mount position on any point to A. 3.1.1.4 4G D .=$4 . ,* 4 7 E4F 97t ?3L) %L6 88p+ , F.7 .=%P
13、 8%F&8x G98F7 4G D .=$48 :E4 7 $4F2P 68p) .(!# .0C7 8F 7$Fx8 4 -F7 :5 -F8p) 6?U7 15 mm 81 A 8 88* :5 3LD8p) 8% F 3L 8 , % 47 888 88?72P A7 9IF 3L 8$ . DF d-L7 8# F&8x G98F+ 7$Fx4 -F8p) 6?U7 25 mm 81 , A# B 8 88* -,!x) 9l 8% F 3L 8# 8p) F$ . Figure 4: Test Sample Mount / ,* 4: 4G D .=$4 GM KOREA ENGI
14、NEERING STANDARDS EDS-T-7523 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 4 of 6 Version : 3 3.2 Test Piece. 3.2.1 Sample Size. 3.2 4G D . 3.2.1 4G D A d . Table 1: Sample Dimensions (mm) / E 1: 4G D8 2l.?3L (mm) Sample / 4G D Length / l8 Width / “G8 Dimensions / ?3L 8
15、0 min. / 80 81 50 min. / 50 81 3.2.2 Number of Samples. Unless otherwise specified, three samples or more should be taken for the test. 3.2.3 Sample Color. Unless otherwise specified, black or similar color samples should be taken. 3.2.4 Pretreatment. Unless otherwise specified on the drawings or in
16、 the requirements of standard material, samples should be left at a temperature of (232) E with relative humidity of (503) % for 48 hours and longer before the test. 4 Procedures 4.1 Conditions. 4.1.1 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Suc
17、h requirements shall be specified on component drawings, test certificates, reports, etc. 4.2 Instructions. 4.2.1 Take a weight that is (100050) g. 4.2.2 First test a pencil of a low hardness (4B) and then use pencils of gradually higher hardness. 4.2.3 Use a sand paper to grind the end point of pen
18、cil lead to form a plane. 4.2.4 Test three samples or more in the way that you use a sample in three different test places three times. 4.2.5 Remove pencil marks by using a block of soft rubber eraser, and check the extent of scratch. 5 Data 5.1 Evaluation. Evaluation must be made based on scratch e
19、xtent according to pencil hardness. 3.2.2 4G D 3L . -$8 9I8 6# 7 , 3P 818 4G D8x 87F$ . 3.2.3 4G D 11 . -$8 9I8 6# 7 , /H( (Black) D# ,7t 8T1F 118 4G D8x 87F$ . 3.2.4 98=* . $+8! 8:7 -$) +4%P 7 1F72P 6=8 6# 7 (232) E , (503) %8 1$43$ F72P 48 48 81 % 6| -? G 4G F$ . 4 4G 98 ,h# (100050) g8p) F$ . 4.2
20、.2 7$Fx8 $# !8t $ (4B)72P.Bd 3P=958p) $4 “8t 7$Fx8x 17F7 4G F$ . 4.2.3 7$Fx4 8 !$+8t 4G 98 DDF +8x 8*66 F,) 1E &%8x 87F7 D+8p) $& 66 F$ . 4.2.4 1 P8 4G D8x 87F7 4G 8t % 8 4G D8 5d $* 88?72P 3 G 44F+ , 4G D8t 3P 818x 87F7 4G F$ . 4.2.5 4G G 7$Fx8 H958t ,h* 7$Fx7 :7P* 87F7 :7 G E+8 5H 9I$* 4=dF$ . 5 4
21、G $8Bd 5.1 D4 . D48 d:48t 17F 7$Fx8 $* d:48p) 5H 9I$7 &d( DD9IF$ . GM KOREA ENGINEERING STANDARDS EDS-T-7523 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 5 of 6 Version : 3 Hardness / $ Grade / &%= Low / 94 Pencil Hardness / 7$Fx $ High / 4B 3B 2B B HB F Good / 1 No Sc
22、ratch / 5H8 98G4 68x 7 . Poor / F Fine Scratch / 5H8 -,2lF !A!8x 7 . Note: From the above evaluation, three repeated tests performed on a sample must meet with the same results as on the three samples or more. / :0 : 1d D472P % 8 4G D7 3G -L.) 4G 8 04 3P 818 4G D7 8G82e8 866 F . 6 Safety This standa
23、rd may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regu
24、latory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: 6 6|987 $4F 7 9 ., E:48t 88G ,p: , 86 , 8/x &%8x E FF 3L 8$ . ., E:48t 87
25、 $4F 170 4)%P +& 6|98 ,l9P8 F8x 9P4F:# 6#$ . &d(2P 17 987 95FF 6|980 I 1B* 9DF , -18 9PF 728 957 7 .* 9IF# 8t ., E:4 1788 =y8 1F8$ . 7 768 9I8 7.1 98,l 76 . F$-1F 68 . 7.2 66 -C dGl . F$-1F 68 . 8 Ed - $* ,l2P! $+ &%72P ., E:48 87%T &# $80 M8 EdF$ . English Test Method for the Pencil Hardness of Pla
26、stic Standard Samples to EDS-T-7523 min Grade Pencil Hardness Test Method Designation ,l F(3D% E:4 4G D8 7$Fx$ 4G - - EDS-T-7523 min &%= 7$Fx $ 4G - 4G F+ GM KOREA ENGINEERING STANDARDS EDS-T-7523 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 6 of 6 Version : 3 9 Releas
27、e and Revisions This standard was originated in December 1998. It was first approved by Engineering Standard Committee in December 1998. It was first published in December 1998. 9 9P9I -C P9I 8)Y ., E:48t 1998“x 1287 E:4 -Gl4 .7 %L6 , d3TE:41,h7 8F 1998 “x 12 87 38%L6$ . ., E:48t 1998 “x 12 87 ) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 3 OCT 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 )
