1、BRITISH STANDARD BS 1155:2003 Natural rubber compounds for extrusion Specification ICS 83.060 BS 1155:2003 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 B
2、ritish Standard: Committee reference PRI/54 Draft for comment 02/122015 DC ISBN 0 580 41851 0 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 Manufact
3、urers Association Ltd. Chemical Industries Association Ministry of Defence RAPRA Technology Ltd. Tun Abdul Razak Research Centre Amendments issued since publication Amd. No. Date CommentBS 1155:2003 BSI 18 June 2003 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2
4、 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 Annex B (informative) Line call-outs 4 Bibliogra
5、phy 5 Table 1 Compound classification 1 Table 2 Physical properties of two-thickness test sheets 3 Table B.1 Line call-outs 4BS 1155:2003 ii BSI 18 June 2003 Foreword This British Standard has been prepared under the direction of the PRI/54, Rubber compounds. It supersedes BS 1155:1992 which is with
6、drawn. One technical change has been made, namely the 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 1992 standard,
7、in which the presentation has been changed to align the 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 2751, Specification for general purpose acrylonitrile-butadiene r
8、ubber compounds. BS 2752, Specification for chloroprene rubber compounds. BS 3227, Specification for butyl rubber compounds (including halobutyl compounds). BS 6014, Specification for ethylene propylene rubber compounds. BS 6996, Specification for mineral oil resistant acrylonitrile-butadiene rubber
9、 compounds. The following British Standards are also relevant to this standard. 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
10、for its correct application. Compliance with a British Standard does not 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
11、indicates when the document was last issued.BS 1155:2003 BSI 18 June 2003 1 1 Scope This British Standard specifies compositional and physical property requirements for four non-black natural rubber compounds designated R40, R50, R60, R70, three non-black natural rubber/zinc oxide compounds designat
12、ed S40, S50, S60 and five black natural rubber compounds designated T40, T50, T60, T70, T80. These compounds are intended for the manufacture of items in the form of extrusions and items cut from extruded sections, e.g. washers. NOTE 1 The compounds do not necessarily have good electrical insulating
13、 properties. NOTE 2 The compounds might not be suitable for use when special properties are required, such as improved 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
14、 rubber compounds specified in this standard do not require to be compounded to be resistant to ozone attack and 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 current
15、ly no British Standard for ozone resistant natural rubber compounds. 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
16、document (including any amendments). BS 903-A1:1996, 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 determina
17、tion of compression set at ambient, elevated or 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 (hardne
18、ss between 10 IRHD and 100 IRHD). 3 Classification 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 high qua
19、lity plantation (Hevea) rubber or superior processing rubber, or on a mixture of both. The high quality plantation (Hevea) rubber shall be one or any combination of the following: pale crepe, or RSS1, or latex grade technically specified natural rubber. It shall be vulcanized with sulfur/organic acc
20、elerator(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 mix. Grade designation Hardness after vulcanization (IRHD) R40 S40 T40 R50 S50 T50 R60 S60 T60 R70 T7
21、0 T 8 0 40 4 +5 50 4 +5 60 4 +5 70 4 +5 80 4 +5BS 1155:2003 2 BSI 18 June 2003 Compounds designated “R” shall be reinforced with non-black fillers. Compounds designated “S” shall be reinforced with zinc oxide only and shall contain no carbon black or mineral filler other than zinc oxide. Compounds d
22、esignated “T” shall be reinforced with carbon black(s), or with carbon black(s) and zinc oxide, and shall contain no other fillers. If ingredients that facilitate processing, e.g. factice and/or softeners, are used in the mixes, the total amount excluding stearic acid shall not exceed 20 p.h.r. Any
23、factice included shall only be a sulfur-vulcanized triglyceride oil type. No reclaimed rubber or ground vulcanized rubber shall be used. The colour of the compounds designated “T” shall be black. NOTE 1 The colour of the compounds designated “R” and “S” should be as agreed between the purchaser and
24、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 items, as practicable, to verify that the composition of the mix conforms to this clause. The methods described in BS
25、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 each batch of rubber mix, a two-thickness test sheet of the following dimensions shall be prepared for testing. The s
26、heet 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. The thicker sections of the sheet shall not be additionally vulcanized. If part of the 6.3 mm section is moulded in
27、the form of cylindrical 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 mo
28、ulded 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) shall conform to the relevant requirements given in Table 2 when tested by the methods specified in the table. NOTE
29、 Guidance for the preparation 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 1155:2003 1) , and grade designation; b) quarter
30、 and year of cure; c) manufacturers identity or trade mark; d) manufacturers batch number or similar means of production identity. 1) Marking BS 1155:2003 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 pr
31、oduct 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 with third party certification of conformity, which may also be desirable.BS 1155:2003 BSI 18 June 2003 3 Table 2 Ph
32、ysical properties of two-thickness test sheets Physical property Grade designation Test method in BS 903 and type of test piece where appropriate R40 S40 T40 R50 S50 T50 R60 S60 T60 R70 S70 T80 Hardness after vulcanization (IRHD) Part A26, method N, two plies, 6.30 mm and 2.00 mm, with the thicker p
33、ly 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 dumbbells Minimum elongation at break (%) 500 600 600 400 500 500 400 400 400 250 300 200 Maximum compression set (%)
34、40 40 40 40 40 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 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 (%
35、of original value) 15 15 15 15 15 NOTE Line call-outs, in accordance with BS 5176, are given in Annex B. a No values are specified for density, but 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
36、 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 1155:2003 4 BSI 18 June 2003 Annex A (informative) Guidance for the preparation and testing of rubber products This British Standard specifies requirements for the rubber compounds when they ar
37、e 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 between manufacturer and purchaser should be sought on the procedure to verify conformity of the manufactured arti
38、cle. 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, extrusion faults and defects which would impair satisfactory performance and should show minimal accelerat
39、or bloom. Finished rubber items should be stored in accordance with BS ISO 2230. Annex B (informative) Line call-outs Line call-outs in accordance with BS 5176:1975 for compounds specified in this standard are given in Table B.1. Table B.1 Line call-outs BS 1154 designation BS 5176 line call-out R40
40、 8MAA 414 A33 B13 Z1 Z2 S40 8MAA 417 A33 B13 Z1 Z2 T40 8MAA 417 A33 B13 Z1 Z2 R50 8MAA 514 A33 B13 Z1 Z2 S50 8MAA 517 A33 B13 Z1 Z2 T50 8MAA 517 A33 B13 Z1 Z2 R60 8MAA 610 A33 B13 Z1 Z2 S60 8MAA 614 A33 B13 Z1 Z2 T60 8MAA 614 A33 B13 Z1 Z2 R70 8MAA 709 A33 B13 Z1 Z2 S70 8MAA 711 A33 B13 Z1 Z2 T80 8M
41、AA 809 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, i.e BS 1155.BS 1155:2003 BSI 18 June 2003 5 Bibliography BS 1154:2003, Specification for natural rubber compounds. 2) BS 2
42、751:2001, Specification for general purpose acrylonitrile-butadiene rubber compounds. 2) 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: Intern
43、ational 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, chlo
44、roprene, nitrile and chlorosulphonated polyethylene rubbers. BS 5176:1975, Specification for classification system for vulcanized 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, Speci
45、fication for ethylene propylene rubber compounds. 2) BS 6996:2003, Specification for 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 ra
46、w and vulcanized rubber Part 3: Methods for determination of solvent extract. BS 7164-5:1991, 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 c
47、ontent Polyisoprene content. BS 7164-13:1994, Chemical tests for raw and vulcanized rubber 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, Chemic
48、al tests for raw and vulcanized rubber Part 21: Determination of nitrogen content. BS 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 o
49、nly.BS 1155:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British S
