1、 ENGINEERING STANDARDS Test Procedure SUPERCEDED EDS-T-7673 Test Method for Apparent Density of Cellular Materials This standard may be applied only for current projects. It is Superceded for all future projects and replaced by ISO845. $)2e 8:8 .(d -4$ 4G - Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P P
2、rogram .Bd# ISO845 ) $4=F7 957F$ . Copyright 2011 General Motors Company All Rights Reserved August 2011 Originating Department: GM Korea Engineering Standards Page 1 of 4 Version : 3 1 Scope Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the event of conflict be
3、tween 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 apparent density of flexible cellular and related materials (rubberized hair, mats, felts etc.) 2 References Note: Only the latest approve
4、d standards are applicable unless otherwise 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 conditioning to EDS-T-7507. 3.1.2 Measuring Device of thickness
5、which can measure to the nearest 0.1 mm and shall not cause the deformation of test piece during the measurement. 3.1.3 Balance Capable of weighing to an accuracy of 0.001 g. 3.2 Test Piece. 3.2.1 Shape and Dimensions. 3.2.1.1 Flexible Cellular Material. Test pieces shall have a minimum volume of 62
6、5 cm3 and test pieces with rectangular faces shall be taken from parts which are indicated on drawings or material specifications etc. 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 $)2e 8: -C 8T18: (,h 2e.8 F8T%P G6 , +C ,
7、 DC &% )8 .(d -4$* 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 EDS-T-75078 98=* 3LFF 3L 8# 38X =- . 3.1.2 0.1 mm : ?U9I 4#F+ , % D ?U9I :E 4G D7 -GI8x :0: 6# % ?U9Id . 3.1.3 0.
8、001 g: ?U9I 4#F 947 . 3.2 4G D . 3.2.1 GI1 -C ?3L . 3.2.1.1 $)2e 8: . 7x9PE72P 62.5 cm3 818 .Fp* J# 9I1+= 4G D8x $+8! 8: &%7 +4 %P .72P =x?F$ . GM KOREA ENGINEERING STANDARDS EDS-T-7673 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 2 of 4 Version : 3 3.2.1.2 Trim Materia
9、l. Test pieces of 100 cm2 shall be taken from the areas having the uniform thickness. 3.2.1.3 Test pieces shall be taken using the cutting dies or saw. Care shall be taken that no damages occur by excessive heat during preparation of test pieces. 3.2.2 Number of Test Pieces. 3.2.1.1 Flexible Cellula
10、r Material. 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 pieces recorded. 3.2.1.2 Trim Materials. For initial sample
11、approval and arbitration purposes, at least 3 test pieces shall be tested and for routine quality control, at least 1 test piece. 4 Procedures 4.1 Conditioning. 4.1.1 Flexible Cellular Material. 4.1.1.1 For initial sample approval and arbitration purposes, tests shall not be performed less than 7 da
12、ys after manufacture and for routine quality control, not less than 72 hours after manufacture. 4.1.1.2 Prior to test, test pieces shall be dried for 3 hours at +70 E 2.5K and conditioned for 16 hours min. at +23 E 2K and (506) % relative humidity. 4.2 Conditions. 4.2.1 Test Conditions. Deviations f
13、rom the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Tests shall be performed at +23 E 5K immediately after conditioning. 4.3.2 The dimensions of test piece shall be det
14、ermined to the nearest 0.1 mm and then the volume calculated. 4.3.3 The test pieces shall be weighed to the nearest 0.001 g. 5 Data 5.1 Evaluations. The density is calculated from the following formula. VMd Where, d = density Kg/m3. M = mass Kg. V = volume m3. 3.2.1.2 !8 8: . 7x9PE72P 89IF % * J# .8
15、x 2TBF7 100 cm28 4G D8x =x?F$ . 3.2.1.3 4G D8t 94 4G F G 5G 4G 0 F8 13T DF8x d)F$ . 3.2.1.2 !8 8: . ) 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 )
