1、BRITISH STANDARD BS 3227:2003 Butyl rubber compounds (including halobutyl compounds) Specification ICS 83.060 BS 3227:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 18 June 2003 BSI 18 June 2003 The following BSI references relate to th
2、e work on this British Standard: Committee reference PRI/54 Draft for comment 02/122017 DC ISBN 0 580 41849 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to PRI/54, Rubber compounds, upon which the following bodies were represented: British
3、 Rubber Manufacturers Association Ltd. Chemical Industries Association Ministry of Defence RAPRA Technology Ltd. Tun Abdul Razak Research Centre Amendments issued since publication Amd. No. Date CommentBS 3227:2003 BSI 18 June 2003 i Contents Page Committees responsible Inside front cover Foreword i
4、i 1S c o p e 1 2 Normative references 1 3 Classification 1 4C o m p o s i t i o n 1 5 Preparation of test sheet 2 6 Physical properties of the vulcanized test sheet 2 7M a r k i n g 2 Annex A (informative) Guidance for the preparation and testing of rubber products 4 Bibliography 5 Table 1 Compound
5、classification 1 Table 2 Physical properties of two-thickness test sheets 3BS 3227:2003 ii BSI 18 June 2003 Foreword This British Standard has been prepared under the direction of PRI/54, Rubber compounds. It supersedes BS 3227:1990 which is withdrawn. One technical change has been made, namely the
6、inclusion of the larger type 1 dumbbell of BS 903-A2 as an alternative to the type 2 dumbbell for the measurement of tensile strength and elongation at break (Table 2). This edition otherwise comprises an editorial revision of the 1990 standard in which the presentation has been changed to align the
7、 text with other British Standards in the group. Other British Standards in this group for rubber compounds are as follows: BS 1154, Specification for natural rubber compounds. BS 1155, Specification for natural rubber compounds for extrusion. BS 2751, Specification for general purpose acrylonitrile
8、-butadiene rubber compounds. BS 2752, Specification for chloroprene rubber compounds. BS 6014, Specification for ethylene propylene rubber compounds. BS 6996, Specification for mineral oil resistant acrylonitrile-butadiene rubber compounds. The following British Standards are also relevant to this s
9、tandard. BS 3558, Glossary of rubber terms. BS 3734-1, Rubber Tolerances for products Part 1: Dimensional tolerances. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does no
10、t of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 3227:2003 BSI 18 June 20
11、03 1 1 Scope This British Standard specifies compositional and physical property requirements for four rubber compounds based on either isobutene-isoprene (butyl) or halogenated isobutene-isoprene (halobutyl) of hardness ranges 50 IRHD to 80 IRHD, designated B50, B60, B70 and B80. These compounds ar
12、e intended for the manufacture of items in the form of extrusions, mouldings, moulded or calendered sheet and for items cut or punched from sheet. NOTE The compounds do not necessarily have good electrical insulating properties. 2 Normative references The following referenced documents are indispens
13、able for the application of this document. For dated references, only the reference cited applies. For undated references, the latest edition of the referenced document (including any amendments). BS 903-A1:1996, Physical testing of rubber Part A1: Determination of density. BS 903-A2:1995, Physical
14、testing of rubber Part A2: Method for determination of tensile stressstrain properties. BS 903-A6:1992, Physical testing of rubber Part A6: Method for determination of compression set at ambient, elevated or low temperatures. BS 903-A19:1998, Physical testing of rubber Part A19: Rubber, vulcanized o
15、r thermoplastic Accelerated ageing and heat resistance tests. BS 903-A26:1995, Physical testing of rubber Part A26: Method for Determination of hardness (hardness between 10 IRHD and 100 IRHD). 3 Classification Compounds shall be classified according to their vulcanized hardness, in international ru
16、bber hardness degrees (IRHD), and designated by grade as shown in Table 1. Table 1 Compound classification 4 Composition The compounds shall be based on isobutene-isoprene copolymer or its halogenated derivatives reinforced only with carbon black(s). NOTE 1 Ethylene propylene terpolymer (EPDM) not e
17、xceeding 10 % by mass of the total polymer content may be incorporated. No factice or other extender, or reclaimed or ground vulcanized rubber shall be used. All ingredients of the mix shall be free from grit and extraneous material. NOTE 2 Chemical analysis may be carried out on either two-thicknes
18、s sample sheets or sample items, as practicable, to verify that the composition of the mix conforms to this clause. The methods described in BS 4181-1, BS 5923-2, BS 7164-2.2, BS 7164-3, BS 7164-5, BS 7164-7.1, BS 7164-13, BS 7164-14, BS 7164-21 and BS 7164-22.1 should be used where relevant. Grade
19、designation Hardness after vulcanization (IRHD) B50 B60 B70 B80 50 4 +5 60 4 +5 70 4 +5 80 4 +5BS 3227:2003 2 BSI 18 June 2003 5 Preparation of test sheet From each batch of rubber mix, a two-thickness test sheet of the following dimensions shall be prepared for testing. The sheet shall be approxima
20、tely 250 mm square with a thicker section along one side 35 mm to 50 mm wide and (6.30 0.15) mm thick. The remainder of the sheet shall be (2.00 0.15) mm thick. The thicker sections of the sheet shall not be additionally vulcanized. If part of the 6.3 mm section is moulded in the form of cylindrical
21、 buttons complying with the type B test piece defined in BS 903-A6 for the purpose of compression set tests, the mould cavities shall be individually charged with pellets and not by the flow of the excess rubber from the remainder of the mould. The minimum number of buttons moulded shall be nine and
22、 they shall be in a group at one end of the 6.3 mm section. 6 Physical properties of the vulcanized test sheet Test pieces cut from the test sheet (see Clause 5) shall comply with the relevant requirements given in Table 2 when tested by the methods specified in Table 2. NOTE Guidance for the prepar
23、ation and testing of rubber products is given in Annex A. 7 Marking The compound, as sheet or items, shall be accompanied by the following information (see also BS ISO 2230): a) number and date of this British Standard, i.e. BS 3227:2003 1) , and grade designation; b) quarter and year of cure; c) ma
24、nufacturers identity or trade mark; d) manufacturers batch number or similar means of production identity. 1) Marking BS 3227:2003 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirem
25、ents 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 confused with third party certification, which may also be desirable.BS 3227:2003 BSI 18 June 2003 3 Table 2 Physical properties of two-thickness tes
26、t sheets Physical property Grade designation Test method in BS 903 series and type of test piece where appropriate B50 B60 B70 B80 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/m 3 ) Agreed value 0.02 a Part A1, method
27、 A Minimum tensile strength (MPa) 10.5 10.5 9.0 9.0 Part A2, type 1 or type 2 dumbbells Minimum elongation at break (%) 550 450 350 300 Maximum compression set (%) 30 25 25 25 Part A6, type B test piece Lubricated, h at (70 1) C a No values are specified for density, but it is recommended that a val
28、ue 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 with this British Standard. 50 4 +5 60 4 +5 70 4 +5 80 4 +5 24 2 0BS 3227:2003 4 BSI 18 June 2003 Annex A (informative) Guidance for the preparatio
29、n 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 can prevent the preparation of some or all test pieces. In this case, agreement betwee
30、n 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 imperfections, voids, inclusions
31、, flow marks, moulding faults and defects which would impair satisfactory performance and should show minimal accelerator bloom. Finished rubber items should be stored in accordance with BS ISO 2230.BS 3227:2003 BSI 18 June 2003 5 Bibliography BS 1154:2003, Specification for natural rubber compounds
32、. 2) BS 1155:2003, Specification for natural rubber compounds for extrusion. 2) BS 2751:2001, Specification for general purpose acrylonitrile-butadiene rubber compounds. 2) BS 2752:2003, Specification for chloroprene rubber compounds. 2) BS 3558-1:1997, Glossary of rubber terms Part 1: International
33、 terms. 2) BS 3558-2:2001, Glossary of rubber terms Part 2: Additional British terms. 2) BS 3734-1:1997, Rubber Tolerances for products Part 1: Dimensional tolerances. 2) BS 4181-1:1985, Identification of rubbers by infra-red spectrometry Part 1: Method for identification of hydrocarbon, chloroprene
34、, nitrile and chlorosulphonated polyethylene rubbers. BS 5923-2:1980, Methods for chemical analysis of rubber Part 2: EDTA titrimetric method for determination of zinc content of rubber products. BS 6014:2003, Specification for ethylene propylene rubber compounds. 2) BS 6996:2003, Specification for
35、mineral oil resistant acrylonitrile-butadiene rubber compounds. 2) BS 7164-2.2:1990, Chemical tests for raw and vulcanized rubber Part 2.2: Sample preparation Vulcanized rubber. BS 7164-3:1992, Chemical tests for raw and vulcanized rubber Part 3: Methods for determination of solvent extract. BS 7164
36、-5:1991, Chemical tests for raw and vulcanized rubber Part 5: Methods for determination of ash content. BS 7164-7.1:1990, Chemical tests for raw and vulcanized rubber Part 7.1: Methods for determination of polymer content Polyisoprene content. BS 7164-13:1994, Chemical tests for raw and vulcanized r
37、ubber Part 13: Method for determination of total hydrocarbon content. BS 7164-14:1996, Chemical tests for raw and vulcanized rubber Part 14: Methods for determination of carbon black content. BS 7164-21:1996, Chemical tests for raw and vulcanized rubber Part 21: Determination of nitrogen content. BS
38、 7164-22.1:1994, Chemical tests for raw and vulcanized rubber Part 22.1: Determination of chlorine content Parr bomb method. BS ISO 2230:2002, Rubber products Guidelines for storage. 2) Referred to in the foreword only.BS 3227:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Insti
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