BS-2751-1990.pdf
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1、BRITISH STANDARD BS 2751:1990 Specification for General purpose acrylonitrile-butadiene rubber compounds NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 09:00:38 GMT+00:00 2006, Uncontrolled
2、Copy, (c) BSI BS 2751:1990 This British Standard, having been prepared under the direction of the Rubber Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 30 September 1990 BSI 02-1999 BS 2751 first published June 1956 BS 3222 first published
3、February 1960 First revision as BS 2751 and BS 3222 (combined) February 1976 Second revision as BS 2751 and BS 3222 (combined) May 1982 Third revision as BS 2751 September 1990 The following BSI references relate to the work on this standard: Committee reference RUM/5 Draft for comment 88/43143 DC I
4、SBN 0 580 18478 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Rubber Standards Policy Committee (RUM/-) to Technical Committee RUM/5, upon which the following bodies were represented: British Rubber Manufacturers Association Chemical
5、 Industries Association Malaysian Rubber Producers Research Association Ministry of Defence Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 09:00:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2751:1990
6、BSI 02-1999 i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Classification1 3Composition1 4Preparation of test sheet1 5Physical properties of the vulcanized test sheet2 6Marking2 Appendix A Guidance for the preparation and testing of rubber products4 Table 1 Compound cla
7、ssification1 Table 2 Physical properties of two-thickness test sheets3 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 09:00:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2751:1990 ii BSI 02-1999 Foreword This British
8、 Standard has been prepared under the direction of the Rubber Standards Policy Committee. It supersedes BS 2751 b) quarter and year of cure; c) manufacturers identity or trade mark; d) manufacturers batch number or similar means of production identity. 1)Marking BS 2751:1990 on or in relation to a p
9、roduct represents a manufacturers declaration of comformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be conf
10、used with third party certification, which may also be desirable. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 09:00:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2751:1990 BSI 02-1999 3 Table 2 Physical properties of two-thickness test sheets Physical pro
11、pertyGrade designationTest Method in BS 903 and type of test piece where appropriate BA40BA50BA60BA70BA80BA90E Hardness after vulcanization (IRHD)Part A26, method N, two plies, 6.30 mm and 2.00 mm, with the thicker ply on top Density (Mg/m3)Agreed value 0.02aPart A1, method A Minimum tensile strengt
12、h (MPa) Minimum elongation at break (%) 7.0 600 7.5 450 8.5 400 12.5 250 12.5 150 12.5 100 8.5 400 Part A2, type 2 dumb-bells Maximum compression set (%)30252020202520Part A6, type 1 test piece, lubricated,h at 70 1 C Resistance to liquids Volume change (%) after immersion in liquid B Part A16, 22 0
13、.25 h at 40 1 C Resistance to low temperature Temperature in C at which the stiffness shall not exceed 70 MPa 30 25 25 20 15 10 25 Part A13, using ethyl alcohol/CO2 cooling medium Adhesion to and corrosion of metalsThere shall be no corrosion or pitting of the metals, and the vulcanizates shall not
14、adhere to the metal surfaces or show any sign of liquid exudation. Discolouration of the metal surfaces shall not be considered cause for rejection. Part A37, method A, using carbon steel and copper, h, 70 1 C Minimum electric strength (kV per 2.5 mm) Minimum surface resistivity (?) Minimum volume r
15、esistivity (?cm) No requirement 5 5? 109 2 ? 109 Part C4 Part C1 Part C2 a No values are specified for density, but it is recommended that a value be established for each composition. This may provide a useful check when a series of batches of the same composition has to be tested for compliance wit
16、h this British Standard. 40+5 4 50+5 4 60+5 4 70+5 4 80+5 4 90+5 4 60+5 4 24+0 2 0 +30 0 +30 0 +25 0 +25 0 +25 0 +25 0 +25 166+2 0 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 09:00:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2751:1990 4 BSI 02-1999 Appe
17、ndix A Guidance for the preparation and testing of rubber products This British Standard specifies requirements for the rubber compounds when tested using a press-cured sample sheet. Where manufactured articles are to be tested the shape and size may prevent the preparation of some or all test piece
18、s. In this case agreement between manufacturer and purchaser should be sought on the procedure to verify compliance of the manufactured article. Where standard test pieces can be prepared from the articles they may be used for quality control tests. Finished rubber items should be free from surface
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