1、BRITISH STANDARD BS 1154:2003 Natural rubber compounds Specification ICS 83.060 BS 1154:2003 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 the work on this British Standar
2、d: Committee reference PRI/54 Draft for comment 02/122014 DC ISBN 0 580 41850 2 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 Rubber Manufacturers Associat
3、ion Ltd. Chemical Industries Association Ministry of Defence RAPRA Technology Ltd. Tun Abdul Razak Research Centre Amendments issued since publication Amd. No. Date CommentBS 1154:2003 BSI 18 June 2003 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative ref
4、erences 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) Relationship of classifications of compounds in previous editions of BS 1154 4 Annex B (informative) Guidance for the prepar
5、ation and testing of rubber products 5 Annex C (informative) Line call-outs 6 Bibliography 7 Table 1 Compound classification 1 Table 2 Physical properties of two-thickness test sheets 3 Table A.1 Relationship of classifications of compounds in previous editions of BS 1154 4 Table C.1 Line call-outs
6、6BS 1154:2003 ii BSI 18 June 2003 Foreword This British Standard has been prepared under the direction of PRI/54, Rubber compounds. It supersedes BS 1154:1992 which is withdrawn. One technical change has been made, namely the inclusion of the larger type 1 dumbbell of BS 903-A2 as an alternative to
7、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 1992 standard, in which the presentation has been changed to align the text with other British Standards in the group. In order that the relati
8、onship between compounds designated in previous editions of this standard and those in the present edition can be ascertained, a brief history of the relationship between classifications of compounds in previous editions is given in tabulated form in Annex A. Other British Standards in this group fo
9、r rubber compounds are as follows: BS 1155, Specification for natural rubber compounds for extrusion. BS 2751, Specification for general purpose acrylonitrile-butadiene rubber compounds. BS 2752, Specification for chloroprene rubber compounds. BS 3227, Specification for butyl rubber compounds (inclu
10、ding halobutyl 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 3558, Glossary of rubber terms. BS 3734-1, Rubb
11、er 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 confer immunity from legal obligations. Summary
12、 of pages This document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 1154:2003 BSI 18 June 2003 1 1 Scope This British Standard specifies compositional
13、and physical property requirements for four non-black natural rubber compounds designated W40, W50, W60, W70, three non-black natural rubber/zinc oxide compounds designated Y40, Y50, Y60 and five black natural rubber compounds designated Z40, Z50, Z60, Z70, Z80. These compounds are intended for the
14、manufacture of items in the form of mouldings, moulded or calendered sheet and for items cut or punched from sheet. NOTE 1 The compounds do not necessarily have good electrical insulating properties. NOTE 2 The compounds might not be suitable for use when special properties are required, such as imp
15、roved ozone or heat resistance, freedom from tarnishing of some metallic components (copper, silver), long term low temperature use or seals in castor oil based fluid systems. The natural rubber compounds specified in this standard do not require to be compounded to be resistant to ozone attack and
16、their resistance to ozone is not tested. Potential users should seek technical advice if they are unsure as to whether ozone resistance is required for their application. There is currently no British Standard for ozone resistant natural rubber compounds. 2 Normative references The following referen
17、ced 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-A1:1996, Physical testing of rubber Part A1: Determination of density
18、. 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 low temperatures. BS 903-A19:1998, Physical testing of rubber Par
19、t 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 Classification Compounds shall be classified according to their vulcanized ha
20、rdness 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 high quality plantation (Hevea) rubber. This rubber shall be one or any combination of the following: pale crepe, or RSS1
21、, or latex grade technically specified natural rubber. It shall be vulcanized with sulfur/organic accelerator(s) activated with up to 2 parts per hundred of rubber by mass (p.h.r) of stearic acid and a minimum of 5 p.h.r of zinc oxide. At least 1 p.h.r of an antioxidant shall be incorporated in the
22、mix. Grade designation Hardness after vulcanization (IRHD) W40 Y40 Z40 W50 Y50 Z50 W60 Y60 Z60 W70 Z70 Z 8 0 40 4 +5 50 4 +5 60 4 +5 70 4 +5 80 4 +5BS 1154:2003 2 BSI 18 June 2003 Compounds designated “W” shall be reinforced with a non-black filler or a mixture of non-black fillers. Compounds design
23、ated “Y” shall be reinforced with zinc oxide only and shall contain no carbon black or mineral filler other than zinc oxide. Compounds designated “Z” shall be reinforced with carbon black(s), or with carbon black(s) and zinc oxide, and shall contain no other fillers. If softeners are used in the mix
24、es for processing, the total amount excluding stearic acid shall not exceed 5 p.h.r for grades Y40 to Y60 and Z40 to Z60 and shall not exceed 10 p.h.r for grades W40 to W70 and Z70 and Z80. No reclaimed rubber or ground vulcanized rubber shall be used. The colour of the compounds designated “Z” shal
25、l be black. NOTE 1 The colour of the compounds designated “W” and “Y” should be as agreed between the purchaser and the supplier. All ingredients of the mix shall be free from grit and extraneous material. NOTE 2 Chemical analysis may be carried out on either two-thickness sample sheets or sample it
26、ems, 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. 5 Preparation of test sheet From e
27、ach 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. The remainder of the sheet shall be (2.00 0.15) mm thick.
28、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 to 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
29、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 test sheet Test pieces cut from the test sheet (see Clause 5) s
30、hall conform to the relevant requirements given in Table 2 when tested by the methods specified in the table. NOTE Guidance for the preparation and testing of rubber products is given in Annex B. 7 Marking The compound, as sheet or items, shall be accompanied by the following information (see also B
31、S ISO 2230): a) number and date of this British Standard, i.e. BS 1154:2003 1) , and grade designation; 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 1154:2003 on or in relation to a product
32、represents a manufacturers declaration of conformity, 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 confused wi
33、th third party certification of conformity, which may also be desirableBS 1154:2003 BSI 18 June 2003 3 Table 2 Physical properties of two-thickness test sheets Physical property Grade designation Test method in BS 903 and type of test piece where appropriate W40 Y40 Z40 W50 Y50 Z50 W60 Y60 Z60 W70 Z
34、70 Z80 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 A M i n i m u m t e n s i l e s t r e n g t h ( M P a )1 71 91 91 71 71 71 41 71 71 01 41 0 Part A2, type 1 or type 2 dumbb
35、ells Minimum elongation at break (%) 500 600 600 400 500 500 400 400 400 250 300 200 M a x i m u m c o m p r e s s i o n s e t ( % ) 3 03 03 03 03 03 03 03 03 03 03 04 0 Part A6, type B test piece Lubricated, h at (70 1) C Resistance to accelerated ageing Part A 19, air-oven method A, (168 2) h, (70
36、 1) C Maximum change in tensile strength (% of original value) 10 10 10 10 10 Part A2, type 1 or type 2 dumbbells Maximum change in elongation at break (% of original value) 15 15 15 15 15 NOTE Line call-outs, in accordance with BS 5176, are given in Annex C. a No values are specified for density, b
37、ut it is recommended that a value be established for each composition. This can provide a useful check when a series of batches of the same composition has to be tested for compliance with this British Standard. 40 4 +5 50 4 +5 60 4 +5 70 4 +5 80 4 +5 24 2 0 BS 1154:2003 4 BSI 18 June 2003 Annex A (
38、informative) Relationship of classifications of compounds in previous editions of BS 1154 The relationship between classifications of compounds since the first edition of this standard in 1944 is summarized in Table A.1, which also provides an aid to users when choosing replacement compounds for app
39、lications for which previous editions of this standard are quoted. Table A.1 Relationship of classifications of compounds in previous editions of BS 1154 Tg a25A:1933 BS 1154:1944 (War emergency) CS b 1949 to 1955 BS 1154:1952 BS 1154:1970 BS 1154:1978 BS 1154:1986 BS 1154:1992 BS 1154:2003 Grade A
40、Y1 Y40 Grade C Quality C, Grade 1 (Drab) Quality C, Grade 2 (Black) Y2 Y50 Grade D Quality D, Grade 1 (Drab) Quality D, Grade 2 (Black) Y3 Y60 Grade E Quality E, Grade 1 (Drab) Y4 Quality E, Grade 2 (Black) CS 2600 Z11 Z40 CS 2509 Z12 Z50 CS 2508 Z13 Z60 CS 2507 Z14 Z70 CS 2506 Z15 Z80 CS 2505 Z16 W
41、40 W50 W60 W70 a Technical Coordinating Committee on General Stores. b Chemical Inspectorate.BS 1154:2003 BSI 18 June 2003 5 Annex B (informative) Guidance for the preparation and testing of rubber products This British Standard specifies requirements for the rubber compounds when they are tested us
42、ing 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 between manufacturer and purchaser should be sought on the procedure to verify conformity of the manufactured article. Wher
43、e 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, flow marks, moulding faults and defects which would impair satisfactory performance and should show minimal accele
44、rator bloom. Finished rubber items should be stored in accordance with BS ISO 2230.BS 1154:2003 6 BSI 18 June 2003 Annex C (informative) Line call-outs Line call-outs in accordance with BS 5176:1975 for compounds specified in this standard are given in Table C.1. Table C.1 Line call-outs BS 1154 des
45、ignation BS 5176 line call-out W 40 7MAA 417 A33 B13 Z1 Z2 Y 40 7MAA 419 A33 B13 Z1 Z2 Z 40 7MAA 419 A33 B13 Z1 Z2 W 50 7MAA 517 A33 B13 Z1 Z2 Z3 Y 50 7MAA 517 A33 B13 Z1 Z2 Z3 Z 50 7MAA 517 A33 B13 Z1 Z2 Z3 W 60 7MAA 614 A33 B13 Z1 Z2 Y 60 7MAA 617 A33 B13 Z1 Z2 Z 60 7MAA 617 A33 B13 Z1 Z2 W 70 7MA
46、A 710 A33 B13 Z1 Z2 Z 70 7MAA 714 A33 B13 Z1 Z2 Z 80 8MAA 810 A33 B13 Z1 Z2 NOTE 1 Z1 is the tolerance of 0.02 Mg/m 3on the agreed value of density. NOTE 2 Z2 is the compositional requirements according to Clause 4 of this standard. NOTE 3 Z3: in the case of W50, a minimum elongation at break of 400
47、 % applies. In the case of Y50 and Z50, a minimum elongation at break of 500 % applies.BS 1154:2003 BSI 18 June 2003 7 Bibliography BS 1155:2003, Specification for natural rubber compounds for extrusion. 2) BS 2751:2001, Specification for general purpose acrylonitrile-butadiene rubber compounds. 2)
48、BS 2752:2003, Specification for chloroprene rubber compounds. 2) BS 3227:2003, Specification for butyl rubber compounds (including halobutyl compounds). 2) BS 3558-1:1997, Glossary of rubber terms Part 1: International terms. 2) BS 3558-2:2001, Glossary of rubber terms Part 2: Additional British ter
49、ms. 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, nitrile and chlorosulphonated polyethylene rubbers. BS 5176:1975, Specification for classification system for vulcanized rubbers. BS 5923-2:1980, Methods for chemical analysi
