1、 ENGINEERING STANDARDS Test Procedure SUPERCEDED EDS-T-7406 Determination of Volume and Density of Elastomers This standard may be applied only for current projects. It is Superceded for all future projects and replaced by ISO2781. ,h.E8 .Fp -C -4$ ?U9I - Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Pro
2、gram .Bd# ISO2781 ) $4=F7 957F$ . Copyright 2011 General Motors Company All Rights Reserved November 2011 Originating Department: GM Korea Engineering Standards Page 1 of 5 Version : 5 1 Scope Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the event of conflict b
3、etween the Korean and English language, the Korean language shall take precedence. 1.1 Purpose. The purpose of this standard is to determine the volume and the density of an elastomeric test piece. The volume will be determined by measuring the weight of the test piece in air, and apparent weight in
4、 a liquid. 1.1.1 Principle. The method of measuring volume is based on the following principle. Any things immersed in a liquid exhibit an apparent loss of weight. This loss of weight is equal to the weight of liquid displaced by the things. If the density of the liquid is known, the volume of thing
5、s may be determined. 1.2 Applicability. This standard shall normally apply to the test pieces of automotive parts whose specific gravity is at least 1. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. BS 718 BS 90
6、3 DIN 12791 2.2 GM Standards/Specifications. None 2.3 Additional References. None 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 . 8 4G E:48t ,h 4G D8 .Fp -C -4$* 9IF# -7 4F 9IF$ . .Fp# 4G D8 )d:E8 ,h7t 6272P8 .(d ,h* ?U9I F8p)4 9I %P$ . 1.1.1 8*
7、. 6& ,p=&: 6= 272P# ,h8 248x !A!$ . 8 24%P ,h# ,p=7t ?G%P 6=8 ,h7t % &%F$ . 6=8 -4$* 6 8$+ ,p=8 .Fp4 9I %T 8$ . 1.2 957 -88 . ., 4G E:48t 8-L958p) /x:E8 1818 8% = .E8 4G D7 957F$ . 2 4) E:4 / :0 : C-H +d%P 9I8 6# F 48 07 38%P E:48x 957F$ . 2.1 17 E:4 / . BS 718 BS 903 DIN 12791 2.2 GM E:4 / . None 2
8、.3 dA E:4 / . None GM KOREA ENGINEERING STANDARDS EDS-T-7406 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 2 of 5 Version : 5 3 Resources 3.1 Equipment. 3.1.1 Balance, accuracy to 0.1 mg. 3.1.2 Apparatus for determining the density of liquid to 0.0005 g/cm3 accurately
9、(a hydrometer to DIN 12791 or BS 718, series L50 or L50SP, or piknometer is suitable.) 3.1.3 Wire of suitable diameter not more than 0.125 mm, of suitable length. The material of the wire shall be such that it has no effect on the elastomer or immersion liquid. 3.1.4 Filter paper or lint free cloth.
10、 3.1.5 If required, sinkers attaching to the test piece. (In case of using the sinkers, it should not affect the measure of test pieces volume) 3.1.6 A beaker of suitable size for the immersion liquid. 3.2 Immersion Liquid. The immersion liquid shall be such that no swelling, dissolution or other ch
11、ange of the test piece occurs (e.g. de-ionised water). Up to 0.1 % of the wetting agency may be added to the immersion liquid to assist in avoiding air bubbles forming on the test piece. 3.3 Test Temperature. The test shall be carried out at a temperature of (23 E 5K). If the hydrometer or pyknomete
12、r is used, the standard temperature shall be observed for apparatus preservation. 3.4 Test Piece. 3.4.1 Test pieces shall be rectangular in shape and taken from test sheets or complete components. The volume of the test pieces shall be from 1 to 2 cm3, the thickness shall be uniform as (20.2) mm. Th
13、e length and width shall not exceed 50 mm. If test pieces are prepared from the test sheets or complete components of a lower thickness than standard, test piece has its thickness. If test sheets or components of a greater thickness are used, the thickness shall be reduced to (20.2) mm. 3.4.2 If com
14、ponents of a large volume (e.g engine mountings) are to be tested except that the length is less than 6 mm, the test pieces shall be prepared to the relevant compartment drawings or specification. 3.4.3 Any deviation regarding the dimensions of test pieces shall be prepared to the relevant compartme
15、nts drawing or material specifications. If impossible, complete components shall be used as the test pieces. 3.4.4 If test sheets or components combined with fabrics are to be tested, the fabric shall be mechanically separated from the elastomers. 3 4G 88 3.1 4G 8/x . 3.1.1 0.1 mg: ?U9I8 4#F 947 . 3
16、.1.2 0.0005 g/cm3: 6=8 -4$* ?U9I F 3L 8# 8/x . (DIN 12791 D# BS 718 8 L50, L50SP7 +4%P F8&)+A D# FpA “+A4 95$-F$ ). 3.1.3 :8 0.125 mm4 “L: 6# 95$-F l88 7t86 (WIRE), 7t868 8:8t ,h D# 6=7 75F8x !?: 6# 8:866 F$ . 3.1.4 98 FxBd , D# .(F8(d 6# = . 3.1.5 Fx7F 7 4G D7 .7 17F# ?95 (Sinker). ?95 * 17F# 7 ?95
17、 8 ,h# ,h 4D8 .Fp ?U9I7 75F8x :8 3L 88x 9I$8 ,h* 49l2P# 6| %P$ . 3.1.6 ?9568x $(8x 3L 8# /x8 . 3.2 ?956 . ?9568t 4G D7 .E8 , 7F D# $* 6& -G$ :0: 6# 6866 F$ (7d 6)X7 7x9PE8 7# ,$4) 17 F$ . 3.4.4 :,p8 .68# DDD4D8! 9PE8x 4G F &# ,h).Bd :,p8x .* F6 F$ . GM KOREA ENGINEERING STANDARDS EDS-T-7406 Copyrigh
18、t 2011 General Motors Company All Rights Reserved November 2011 Page 3 of 5 Version : 5 3.4.5 Care shall be taken that no change of density shall be caused by compressive stress during preparation of the test pieces. The surface of the test pieces shall be smooth and free from cavities to avoid air
19、bubbles adhering to them when dipped in the immersion liquid. 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 on component drawings, test certificates, reports, etc. 4.1.2 Conditio
20、ning. For initial sample approval and arbitration purposes, the minimum period after vulcanuzation shall be 7 days. For routine quality control, the period shall be at least 3 days. The test piece of elastomer shall remain at a temperature 23 E for at least 8 hours before testing, and shall be free
21、from external stress during this period. 4.2 Instructions. 4.2.1 The test piece shall be suspended on the wire and weighed in air to the nearest 1 mg. 4.2.2 The test piece shall be suspended in the immersion liquid and re-weighed to the nearest 1 mg. Normally de-ionised water (! = 1 g/cm3) shall be
22、used as an immersion liquid. If water is unsuitable as immersion liquid, an alternative liquid shall be used. In this case, the density of the selected liquid shall be previously determined by clause 3.1.2. 4.2.3 If the density of the test piece is less than that of de-ionised water, either a liquid
23、 of lower density shall be selected or sinker weights (reference to clause 3.1.5) attached to the test piece. In the latter case, the apparent weight of the sinkers shall be determined in the immersion liquid. Care shall be taken that no air bubbles adhere to the test piece or sinkers when the test
24、piece is weighed in the immersion liquid. The test piece and sinkers shall be quickly dipped into methanol or ethanol prior to the immersion in the liquid to minimize air bubbles adhering on them and used. Care shall be taken to avoid the carry-over of excess alcohol into the immersion liquid. 5 Dat
25、a 5.1 Evaluations. 5.1.1 The volume is calculated as follows: 5.1.1.1 Determination of volume in the absence of sinkers. v=m -m1 2FU3.4.5 4G D8x :4/xF# % 6| 6)Y7 8F7 -4$4 -F: 6$) :08 F6 F$ . 4G D8 ?956 27 8l & )d -78 +.G4 : 6$) 4G D E+8t +!x)1 1=4 666 F$ . 4 4G 92 388 0 %L66 F$ . ,h 4G D8t 4G 987 6x
26、,h 7)Y$ -O: 68t 88T)7 1B) 23 E72P 848 81 -? %L66 F$ . 4.2 4G - . 4.2.1 4G D8x 7t867 +$ )d:E72P 1 mg: ,h* ?U9I F$ . 4.2.2 4G D8x ?956 272P 7t867 +$ =x $4 1 mg: ,h* ?U9I F$ . ?9568p)# .(B 873L* ! = 1 g/cm3) 17 F$ . ,p8 ?9568p) 95$-? 68p+ -$) ?9568x 2TBF7 17 F$ . 8)$ 7 2TBF ?9568 -4$* 3.1.292G Fd 88F2P
27、# 4G D0 ?95 * ?9567 “Wd 987 +?68! 7? 67 /* $($4 !# -8x 17 F 3L 8$ . 8& 4G D0 ?95 7 ,6 8# 68 ?9567 7b: 6$) :08F$ . 5 4G $8Bd 5.1 D4 . 5.1.1 .Fp8 18t 6x(7t M$ . 5.1.1.1 ?95 4 6# 1B72P8 .Fp 9I . v=m -m1 2FU GM KOREA ENGINEERING STANDARDS EDS-T-7406 Copyright 2011 General Motors Company All Rights Reser
28、ved November 2011 Page 4 of 5 Version : 5 Where, V = volume of test piece (cm3). m1 = weight of test piece in air (g). m2 = apparent weight of test piece in immersion liquid (g). ! F = density of immersion liquid (g/cm3). 5.1.1.2 Determination of volume when sinkers are used. v=m -(m -m )1 4 3FUWher
29、e, V = volume of test piece (cm3). m1 = weight of test piece in air (g). m3 = apparent weight of sinkers in immersion liquid (g). m4 = apparent weight of test piece plus sinkers in immersion liquid (g). ! F = density of immersion liquid (g/cm3). 5.1.2 The density is calculated as follows. U mv1 Wher
30、e, ! = density of test piece (g/cm3). V = volume of test piece (cm3). m1 = weight of test piece in air (g). 5.2 Expression of Results. 5.2.1 The volume of an elastomer is expressed in cm3 to the nearest 0.001 cm3. The results may be expressed as individual values or as the arithmetic mean of more th
31、an one value. 5.2.2 The density is expressed in g/cm3 or in kg/m3 to the nearest 0,001. The expression of results complies with clause 5.2.1. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associate
32、d 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. Density: To be the mass per unit volume. 7.2 Acronyms, Abbreviations, and Symbols.
33、Not applicable. 7 d2P , V = 4G D8 .Fp (cm3). m1 = 4G D8 )d:E ,h (g). m2 = ?956 272P 4G D8 .(d ,h (g). ! F = ?9568 -4$ (g/cm3). 5.1.1.2 ?95 * 17F 7 .Fp8 9I . v=m -(m -m )1 4 3FU7 d2P , V = 4G D8 .Fp (cm3). m1 = 4G D8 )d:E ,h (g). m3 = ?956 272P ?95 8 .(d ,h (g). m4 = ?956 272P ?95 7t 4G D8 .(d ,h (g)
34、. ! F = ?9568 -4$ (g/cm3). 5.1.2 -4$8 18t 6x(7t M$ . U mv1 7 d2P , = 4G D8 -4$ (g/cm3). V = 4G D8 .Fp (cm3). m1 = 4G D8 )d:E ,h (g). 5.2 0 EG8 . 5.2.1 ,h8 .Fp# 0.001: cm3) EG8 F$ . 0# P-95 F8p) EG8 F! 1P 818 F8t 13T958 D?) !A!$ . 5.2.2 -4$# 0.001 : g/cm3 D# kg/m3 8p) EG8F$ . 0 EG88t 5.2.19) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 5 NOV 2011 Apply new Engineering Standard Template. Superceded (Polymer / Organic Material Lab Team) / 4 d3TE:4 64 957 . F9I957 =* (G)8*4G D4 )
