1、 ENGINEERING STANDARDS Test Procedure SUPERCEDED EDS-T-7670 Test Method for Compression Set of Cellular Material This standard may be applied only for current projects. It is Superceded for all future projects and replaced by ISO1856. $)2e 8:8 62lC 4G - Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Progr
2、am .Bd# ISO1856 8p) $4=F7 957F$ . Copyright 2011 General Motors Company All Rights Reserved August 2011 Originating Department: GM Korea Engineering Standards Page 1 of 5 Version : 3 1 Scope Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the event of conflict bet
3、ween 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 compression set of cellular material at constant strain. 2 References Note: Only the latest approved standards are applicable unless otherw
4、ise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. EDS-T-7507 2.3 Additional References. None 3 Resources 3.1 Equipment. 3.1.1 Humidity Chamber capable of maintaining the temperature of +23 E 2K and the relative humidity (506) %. 3.1.2 Air Circulating Oven ca
5、pable of maintaining the temperature of +70 E 2.5K. 3.1.3 Measuring Device of thickness which can measure to the nearest 0.1 mm and shall not cause the deformation of test piece during the measurement. 3.1.4 Compression Device (See Figure 1). This is composed of two flat plates larger than test piec
6、e, spacers and clamp. Two plates shall be parallel to each other and capable of adjusting to specific height (h1). 3.1.5 Low-Temperature Chamber capable of maintaining the temperature of (-30) E 3K. 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 -
7、C 957 -88 . ., 4G -8t 89I -GI F72P $)2e 8:8 62 * 9IFd 88F 17F$ . 2 4) E:4 / :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 / . EDS-T-7507 2.3 dA E:4 / . None 3 4G 88 3.1 4G 8/x . 3.1.1 +23 E 2K8 7$7t (506) %8 1$4 3$* 8T: 4#F 38X =- . 3.1.2 +70 E 2K8 7$* 8T: 4#F )d 3PG
8、4 7X/D . 3.1.3 0.1 mm : ?U9I 4#F+ , % ?U9I :E 4G D7 -GI8x :0: 6# % ?U9Id . 3.1.4 6 8/x (,* 1 =l9 ). 4G D8 ?3L.($ A 2P8 DDF DD0 3D82P , A(F8) 2e%L68p+ , %DD8t 2P) DFF %DD 188 )88t C9I -GI “8 (h1): 99 8/x 3.2 Test Piece. 3.2.1 Shape and Size of Test Pieces. Test pieces shall have parallel top and bott
9、om surfaces and vertical sides and be (501) mm long, (501) mm wide and (251) mm thick and taken from the representative of material. The areas of complete components from which test pieces shall be taken may be indicated on drawings, specifications etc. For thinner components than required thickness
10、, thickness shall be adjusted by plying up. 3.2.2 Preparation of Test Pieces. 3.2.2.1 Test pieces shall be taken from the complete component using the cutting dies, stamp or saw etc. and indicated on material specifications and drawings. 3.2.2.2 The direction exerting pressure force over the test pi
11、ece shall be same as real conditions. 3.2.3 Number of Test Pieces. A minimum of 3 test pieces shall be tested. If any individual measured value differs by more than 20 % from the arithmetic average of 3 test pieces, 2 further test pieces shall be tested and the arithmetic average of all 5 test piece
12、s recorded. 4 Procedures 4.1 Conditioning. 4.1.1 For initial sample approval and arbitration purposes, tests shall not be performed less than 7 days after manufacture and for routine quality control, not less than 72 hours after manufacture. 4.1.2 Prior to test, test pieces shall be dried for 3 hour
13、s at +70 E 2.5K (After humidity ageing, dried for 16 hours) and conditioned for 16 hours min at +23 E 2K and (506) % relative humidity. 3.2 4G D . 3.2.1 4G D8 GI1 -C ?3L . 4G D8 8K+0 -E+8t DFF 7:+8t 3L:8 %L$) l8 (501) mm, E! (501) mm, % (251) mm ) 8: 8$72P =x?F$ . 7x9PE72P 4G D8x =x?47 $+8! 8: &%7 +
14、4%P .8872P =x?F , +6 7 % .($ , 68t 9PE8t + P* % * +$ . 3.2.2 4G D8 :4/x . 3.2.2.1 4G D8t 9 F:E8x 4F# -F8t 49P 90 % 8F -F8p) 9IF$ . 3.2.3 4G D8 3L( . 2 3P 818 4G D8p) 4G F6 F+ , +6 PP8 ?U9IF8 5 08 13T D DF0 20 % 81 =8 ! & 2P8 4G D8x 4F7 4G G 5P 4G D 08 13T DF8x d)F$ . 4 4G 9 9 . Code / & Compression
15、(%) / 6 (%) A Special regulation / C-H 9P B 50 C 75 D 90 4.2.2 Detailed Test Conditions. 4.2.2 2l.4G 9 . Code / & Compression conditions / 6 9 Reaction conditions / G.) 9 Time (hour) / 48 (hour) Temperature ( E ) / 7$ ( E ) Time (minute) / 48 (minute) Temperature ( E ) / 7$ ( E ) 1 Special regulatio
16、n / C-H 9P 60+10 +235 2 22-2 +702.5 60+10 +235 3 70-2 +235 60+10 +235 4 22-2 -303 60+10 -303 4.2.3 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instruct
17、ions. 4.3.1 Immediately after conditioning, the thickness of test piece shall be measured to the nearest 0.1 mm at +23 E 2.5K. 4.3.2 The test piece shall be placed in the compression device and tightened according to thickness (h1) in specified compression conditions using the spacer and subjected t
18、o the specific test conditions. 4.3.3 After completion of the test period, the test pieces shall be removed from the compression device and recovered according to the specific recovery conditions and the thickness (h2) measured. 4.2.3 4G 9 . .,E:48p).Bd-6!#7 1F8t $-188 F8F6 F+ , 4)$+ , 4G 2e952P , .
19、(2P&%7$+d%L66F$ . 4.3 4G - . 4.3.1 98=* G :4 +23 E 2.5K 8 7$ F72P 4G D8 % * 0.1 mm: ?U9IF$ . 4.3.2 4G D8x 6 8/x7 “W 3D82P* 87F7 C9I 6 97 &d( % (h1)7 + G $H 9I4A C9I 4G 98x .7 F$ . 4.3.3 4G d8 7x* G 4G D8x 6 8/x72P ! C9I G.) 97 &d( G.) 4A G % (h2)* ?U9IF$ . GM KOREA ENGINEERING STANDARDS EDS-T-7670 C
20、opyright 2011 General Motors Company All Rights Reserved August 2011 Page 4 of 5 Version : 3 5 Data 5.1 Evaluations. Compression set shall be calculated as follows. Compression Set(%) = h 4 F h 6h4 F h 5 100 Where, h0 = Initial thickness of test piece mm. h1 = Thickness of spacer mm. h2 = Thickness
21、of test piece after test mm. 5.2 Expression of Results. The calculated compression set of cellular material shall be expressed as arithmetic average of individual results in % rounded to the nearest 0.5 %. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standa
22、rd 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 regulatory limitations prior to use. 7 Notes 7.1 Glossary. Compression Set: To
23、 be the difference between the initial height and the final height of a test piece of the cellular material after compression under specified time and temperature and recovery time, expressed as percentage of the initial deflection. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable. 8 Coding
24、System This standard shall be referenced in other documents, drawings, etc., as follows: 5 4G $8Bd 5.1 D4 . 62t8t $847 8F 1F$ . 62 (%) = h 4 F h 6h4 F h 5 100 7 d2P , h0 = 4G D8 2t8t 5 4G 08 13T DF8x F %) !A!+ , 0.5 %: E4F$ . 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 . 62t : $)2e 8:8 4G D8x C9I 480 7$F72P 6 G G.) 4d8x& 4G D 9“8 188 =8* 2 - EDS-T-7670 - B 2 - 40 % max. 7 9 4.2.299 4G - 4G F+ 9 Release and Revisi
26、ons This standard was originated in July 1994. It was first approved by Engineering Standard Committee in July 1994. It was first published in July 1994. 9 9P9I -C P9I 8)Y ., E:48t 1994 “x 7 87 E:4 -Gl4 .7 %L6 , d3TE:41,h7 8F 1994“x 787 38%L6$ . ., E:48t 1994“x 787 ) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 3 AUG 2011 Apply new Engineering Standard Template. Superceded (Polymer / Organic Material Lab Team) / 4 d3TE:4 64 957 . F9I957 =* (G)8*4G D4 )
