BS-3227-2003.pdf
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1、BRITISH STANDARD BS 3227:2003 Butyl rubber compounds (including halobutyl compounds) Specification ICS 83.060 ? Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:11:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3227:2003 This British Standard was published under the authority of the Stand
2、ards Policy and Strategy Committee on 18 June 2003 BSI 18 June 2003 The following BSI references relate to the 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
3、Standard was entrusted to PRI/54, Rubber compounds, upon which the following bodies were represented: British Rubber Manufacturers Association Ltd. Chemical Industries Association Ministry of Defence RAPRA Technology Ltd. Tun Abdul Razak Research Centre Amendments issued since publication Amd. No.Da
4、teComment Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:11:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3227:2003 BSI 18 June 2003 i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3Classification1 4Composition1 5Preparation of test sh
5、eet2 6Physical properties of the vulcanized test sheet2 7Marking2 Annex A (informative) Guidance for the preparation and testing of rubber products4 Bibliography5 Table 1 Compound classification1 Table 2 Physical properties of two-thickness test sheets3 Licensed Copy: sheffieldun sheffieldun, na, We
6、d Nov 29 08:11:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 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 It supersedes BS 3227:1990 which is withdrawn.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 inclusion of t
7、he 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 text with oth
8、er 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-butadiene rub
9、ber 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 standard. BS 35
10、58, 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 not of itself co
11、nfer 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. Licensed Copy: sheffieldun sheffieldun,
12、na, Wed Nov 29 08:11:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3227:2003 BSI 18 June 2003 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 (halobuty
13、l) of hardness ranges 50 IRHD to 80 IRHD, designated B50, B60, B70 and B80. These compounds are intended for the manufacture of items in the form of extrusions, mouldings, moulded or calendered sheet and for items cut or punched from sheet. NOTEThe compounds do not necessarily have good electrical i
14、nsulating properties. 2 Normative references The following referenced documents are indispensable 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:
15、1996, Physical testing of rubber Part A1: Determination of density. BS 903-A2:1995, Physical 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
16、 low temperatures. BS 903-A19:1998, Physical testing of rubber Part A19: Rubber, vulcanized or 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 Classificat
17、ion Compounds shall be classified according to their vulcanized hardness, in international rubber 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 deriva
18、tives reinforced only with carbon black(s). NOTE 1Ethylene propylene terpolymer (EPDM) not exceeding 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
19、 and extraneous material. NOTE 2Chemical analysis may be carried out on either two-thickness 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
20、, BS 7164-13, BS 7164-14, BS 7164-21 and BS 7164-22.1 should be used where relevant. Grade designationHardness after vulcanization (IRHD) B50 B60 B70 B80 50 4 +5 60 4 +5 70 4 +5 80 4 +5 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:11:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3227
21、: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 approximately 250 mm square with a thicker section along one side 35 mm to 50 mm wide and (6.30 0.15) mm thick.
22、 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 buttons complying with the type B test piece defined in BS 903-A6 for the purpose of compression set
23、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 they shall be in a group at one end of the 6.3 mm section. 6 Physical properties of the vulcanized te
24、st 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. NOTEGuidance for the preparation and testing of rubber products is given in Annex A. 7 Marking The compound, as sheet or items, sh
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