BS-6014-2003.pdf

BRITISH STANDARD BS 6014:2003 Incorporating Corrigendum No. 1 Ethylene propylene rubber compounds Specification ICS 83.060 ? Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:25:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6014:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 18 June 2003 © BSI 4 September 2003 The following BSI references relate to the work on this British Standard: Committee reference PRI/54 Draft for comment 02/122018 DC ISBN 0 580 41848 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted to PRI/54, Vulcanized rubber compounds, upon which the following bodies were represented: British Rubber Manufacturers Assn Chemical Industries Association Ministry of Defence RAPRA Technology Ltd Tun Abdul Razak Research Centre Amendments issued since publication Amd. No.DateComment 14585 Corrigendum No.1 4 September 2003 Changes to Table 2 and Table 3 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:25:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6014:2003 © BSI 4 September 2003 i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3Classification1 4Composition1 5Preparation of test sheet2 6Physical properties of the vulcanized test sheet2 7Marking2 Annex A (informative) Guidance for the preparation and testing of rubber products5 Annex B (informative) Line call-outs6 Bibliography7 Table 1 Compound classification1 Table 2 Physical properties of two-thickness sulfur vulcanized test sheets3 Table 3 Physical properties of two-thickness peroxide vulcanized test4 Table B.1 Line call-outs6 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:25:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6014:2003 ii© BSI 4 September 2003 Foreword This British Standard has been prepared under the direction of PRI/54, Vulcanized rubber compounds. It supersedes BS 6014:1991, which is withdrawn.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 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 1991 standard, in which the presentation has been changed to align the text with other British Standards in the group. Requirements for general purpose acrylonitrile-butadiene rubber compounds are given in BS 2751. Other British Standards in this group for rubber compounds are as follows: BS 1154, Natural rubber compounds Specification. BS 1155, Natural rubber compounds for extrusion Specification. BS 2751, General purpose acrylonitrile-butadiene rubber compounds Specification. BS 2752, Chloroprene rubber compounds Specification. BS 3227, Butyl rubber compounds (including halobutyl compounds) Specification. BS 6996, Mineral oil resistant acrylonitrile-butadiene rubber compounds Specification. 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 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 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:25:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6014:2003 © BSI 4 September 2003 1 1 Scope This British Standard specifies compositional and physical property requirements for five sulfur vulcanized (S) and five peroxide vulcanized (P) ethylene propylene rubber compounds of hardness range 40 IRHD to 80 IRHD, designated EP40, EP50, EP60, EP70 and EP80. 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 insulating 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-A1:1996, 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 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 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 entirely on an ethylene propylene copolymer or terpolymer and shall be vulcanized either with a sulfur/organic accelerator system or with an organic peroxide system as appropriate. NOTE 1A sufficient quantity of oil(s) or plasticizer(s) of a suitable type may be incorporated to assist processing or to obtain the specified physical properties. No reclaimed or ground vulcanized rubber shall be used. All ingredients of the mix shall be free from grit 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, BS 7164-13, BS 7164-14, BS 7164-21 and BS 7164-22.1 should be used where relevant. Grade designationHardness after vulcanization (IRHD) EP40SaEP40Pa EP50SEP50P EP60SEP60P EP70SEP70P EP80SEP80P a Compounds EP40S and EP40P are not necessarily suitable for extrusion. 40 4 +5 50 4 +5 60 4 +5 70 4 +5 80 4 +5 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:25:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6014:2003 2© BSI 4 September 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. 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 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 test sheet Test pieces cut from the test sheet (see Clause 5) shall comply with the relevant requirements given in Table 2 and Table 3 when tested by the methods specified in the tables. NOTEGuidance 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 6014:20031), 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 6014:2003 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 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. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:25:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6014:2003 © BSI 4 September 2003 3 Table 2 Physical properties of two-thickness sulfur vulcanized test sheets Physical propertyGrade designationTest method in BS 903 and type of test piece where appropriate EP40SEP50SEP60SEP70SEP80S 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 strength (MPa)1010101010 Part A2, type 1 or type 2 dumbbells Minimum elongation at break (%)400400350250150 Maximum compression set (%)3535353535 Part A6, type B test piece Lubricated,h at (100 ± 1) °C Resistance to accelerated ageing Part A19, air-oven method A, h, (100 ± 1) °C Change in hardness degrees (IRHD)0 +10 0 +10 0 +10 0 +10 0 +10 Part A26, method N, measurement before and after ageing on the same 2 plies each 2.00 mm thick Maximum change in tensile strength2020202020 Part A2, type 1 or type 2 dumbbells (% of original value) Maximum change in elongation at break2525252525 (% of original value) NOTELine 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 may 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 72 2 0 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:25:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6014:2003 4© BSI 4 September 2003 Table 3 Physical properties of two-thickness peroxide vulcanized test Physical propertyGrade designationTest method in BS 903 and type of test piece where appropriate EP40PEP50PEP60PEP70PEP80P 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 strength (MPa)1010141414 Part A2, type 1 or type 2 dumbbells Minimum elongation at break (%)400400300200150 Maximum compression set (%)3535353535 Part A6, type B test piece Lubricated,h at (125 ± 2) °C Resistance to accelerated ageing Part A19, air-oven method A, h, (125 ± 2) °C Change in hardness degrees (IRHD)0 +10 0 +10 0 +10 0 +10 0 +10 Part A26, method N, measurement before and after ageing on the same 2 plies each 2.00 mm thick Maximum change in tensile strength2020202020 Part A2, type 1 or type 2 dumbbells (% of original value) Maximum change in elongation at break2525252525 (% of original value) NOTELine 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 may 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 72 2 0 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:25:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6014:2003 © BSI 4 September 2003 5 Annex A (informative) Guidance for the preparation and testing of rubber products This British Standard specifies requirements for the rubber compounds when they are 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 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, 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. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:25:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6014:2003 6© BSI 4 September 2003 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 6014 designationBS 5176 line call-out EP 40S4MBA 410 A14 B14 Z1 Z2 EP 50S4MBA 510 A14 B14 Z1 Z2 EP 60S4MBA 610 A14 B14 Z1 Z2 EP 70S4MBA 710 A14 B14 Z1 Z2 EP 80S4MBA 810 A14 B14 Z1 Z2 EP 40P2MCA 410 A15 B15 Z1 Z2 EP 50P2MCA 510 A15 B15 Z1 Z2 EP 60P2MCA 614 A15 B15 Z1 Z2 EP 70P2MCA 714 A15 B15 Z1 Z2 EP 80P2MCA 814 A15 B15 Z1 Z2 NOTE 1Z1 is the tolerance of ± 0.02 Mg/m3 on the agreed value of density. NOTE 2Z2 is the compositional requirements according to Clause 4 of this standard. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:25:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6014:2003 © BSI 4 September 2003 7 Bibliography BS 1154:2003, Specification for natural rubber compounds.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 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 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, 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 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 raw and vu