1、BS F 152:2006Properties of silicone rubber sheet, mouldings and extrusions (general purpose) SpecificationICS 49.025.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPublishing and copyright informationThe BSI copyright notice displayed in this document indicat
2、es when the document was last issued. BSI 2006ISBN 0 580 49383 0The following BSI references relate to the work on this standard:Committee reference ACE/65Draft for comment 05/30130013 DCPublication historyFirst published October 2006Amendments issued since publicationAmd. no. Date Text affectedBS F
3、 152:2006 BSI 2006 iBS F152:2006ContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 24 Material 25 Properties 36 Test sheet manufacture 47 Test methods 48 Quality of material 59 Marking, labelling and packaging 6AnnexesAnnex A (normative) Manufacture of test sheet 7Bibliograp
4、hy 8List of tablesTable 1 Tests as moulded material 3Table 2 Tests after exposure to heat ageing 4Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover.BS F 152:2006ii BSI 2006ForewordPublishing informationTh
5、is British Standard was published by BSI and came into effect on 31 October 2006. It was prepared by ACE/65/-/25, Rubbers, elastomers and sealants, under the authority of Technical Committee ACE/65, Inspection and testing requirements for non-metallic materials. A list of organizations represented o
6、n this committee can be obtained on request to its secretary.Information about this documentThis document supersedes DTD 5531A July 1981, which was declared obsolescent by the Ministry of Defence from 1 April 1999 and DTD 818 Class L, which was declared obsolescent by the Ministry of Defence in 1999
7、.Hazard warningsWARNING. This British Standard calls for the use of substances and/or procedures that can be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any st
8、age.Use of this documentIt has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented
9、 in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.Contractual and legal considerationsTh
10、is 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 cannot confer immunity from legal obligations. BSI 2006 1BS F 152:20061 ScopeThis British Standard specifies requirements for si
11、licone rubber material possessing excellent ozone resistance properties intended for the production of items such as sheet, mouldings and certain extrusions for use in mainly mechanical applications in contact with air over the temperature range 65 C to 230 C1).This material standard is to be used i
12、n conjunction with BS EN 3207.NOTE 1 Material and products manufactured from this specification are not intended for liquid sealing or for an application where low compression set is of prime importance.NOTE 2 Occasional contamination by silicate ester and phosphate ester hydraulic fluids, di-ester
13、greases is not unduly detrimental provided the temperature is not excessive. Contact with fuels, light mineral oils, silicone liquids or greases derived from these should be avoided.NOTE 3 Further information on the suitability of silicone rubber for design applications can be found in SBAC Technica
14、l Specification No. 97 1.NOTE 4 Marking BS F 152:2006 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 solely the claimants respo
15、nsibility. Such a declaration is not to be confused with third party certification of conformity.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the reference cited applies. For undated references, the latest
16、 edition of the referenced document (including any amendments) applies.BS 903-A1 (ISO 2781), Physical testing of rubber Part A1: Determination of densityBS 903-A6 (ISO 815), Physical testing of rubber Part A6: Method for determination of compression set at ambient, elevated or low temperaturesBS 903
17、-A26 (ISO 48), Physical testing of rubber Part A26: Method for determination of hardness (hardness between 10 IRHD and 100 IRHD)BS 3734-1 (ISO 3302-1), Rubber Tolerances for products Part 1: Dimensional tolerancesBS EN 3207, Rubber compounds Technical specificationBS F 68, Controlled storage of vulc
18、anized rubbers for use in aerospace applicationsBS F 69, Packaging and identification of vulcanized rubber items1)Silicone rubber products when properly stored at room temperature and, in the absence of hostile environments, deteriorate very slowly and, for most practical purposes, the storage life
19、may be considered indefinite. However, the rate of deterioration increases markedly with increase in temperature and the service life of the rubber therefore depends upon the operational temperature. Conversely, the maximum temperature at which the rubber may be used depends upon the useful life req
20、uired.BS F 152:20062 BSI 2006BS ISO 34-1, Rubber, vulcanized or thermoplastic Determination of tear strength Part 1: Trouser, angle and crescent test piecesBS ISO 37, Physical testing of rubber Part A2: Method for determination of tensile stress Strain propertiesBS ISO 188 (BS 903-A19), Rubber, vulc
21、anized or thermoplastic Accelerated ageing and heat resistance tests3 Terms and definitionsFor the purposes of this British Standard, the following terms and definitions apply3.1 polymer material formed by joining together many (poly) individual units (mer) of one or more monomers3.2 vulcanizationth
22、ermosetting reaction involving the use of heat and pressure, resulting in greatly increased strength and elasticity of rubber-like materials4Material4.1 Material compositionSilicone polymer shall consist of a homogeneous mix of recognized rubber quality products suitably compounded and cured to meet
23、 the requirements of this specification. No reclaimed or ground vulcanized waste shall be used in the mix.4.2 Manufacturing controlSilicone rubber material and products manufactured from this material shall be formulated and manufactured to issue controlled documentation, which shall form part of th
24、e contract between purchaser and manufacturer.Changes to the formulation or manufacturing process shall not be made without due consideration being given that the modified material/product meets all the requirements of the standard.4.3 Classification and gradesMaterial shall be supplied in four nomi
25、nal hardness grades: Grade 50; Grade 60; Grade 70; Grade 80. BSI 2006 3BS F 152:2006Material or products manufactured to a nominal hardness grades other than those specified shall, with the exception of hardness, meet all the requirements of this specification specified for the grade embracing the n
26、ominal hardness value. Tolerances, if required tighter than those specified within this specification, shall not be tighter than 3.NOTE For example, where a hardness of 65 is specified, the requirements of Grade 60 apply as the value of 65 lies within the 56 to 65 hardness range of Grade 60.5Propert
27、iesMaterial manufactured in accordance with Annex A shall meet the requirements specified in Tables 1 and 2.The first production batch and every subsequent 10th batch of material shall be fully tested in accordance with material standard line numbers specified in Tables 1 and 2.All other batches of
28、material shall be tested in accordance with material standard line numbers 1, 3 and 15 of Table 1.Table 1 Tests as moulded materialBS EN 3207 material standard line numberTest Test requirementGrade 50 Grade 60 Grade 70 Grade 801a) Hardnes, IRHD 50+5p460+5p470+5p480+5p423b) Density, Mg/m3Within 0.05
29、of requirement within controlling documentation.45 c) Tensile strength, MPOa (min.) 5.5 5.5 5.5 5.567 d) Elongation at break, % (min.) 280 250 200 160891011 g) Tear strength, N/mm (min.) 15 15 12.5 12.512131415 e) Compression set, % (max.) 25 25 25 25BS F 152:20064 BSI 20066 Test sheet manufactureMa
30、nufacture sufficient test sheets and/or cylindrical buttons in accordance with Annex A for the determinations of properties required in Clause 8.7 Test methods7.1 Accelerated ageing Test specimens, when required, shall be subjected to accelerated temperature ageing in accordance with BS ISO 188 for
31、(336 2) h at (200 3) C.7.2 Determination of hardness7.2.1 As manufactured materialDetermination of hardness shall be conducted in accordance with BS 903-A26, Method N on a specimen extracted from the thicker portion of the test sheet and superimposed upon the thinner section of the same sheet during
32、 test. 7.2.2 Before and after heat ageingDetermination of the effects of heat ageing on the hardness of the material shall be conducted in accordance with BS 903-A26, Method N by testing two plies of the thinner section of the test sheet superimposed upon each other. Tests shall be carried out prior
33、 to and after accelerated heat ageing.Table 2 Tests after exposure to heat ageingBS EN 3207 material standard line numberTest Test requirementGrade 50 Grade 60 Grade 70 Grade 8012 Tests on standard test pieces unless otherwise specified after accelerated temperature ageing according to BS ISO 188.3
34、Permissible variation of the properties compared to the initial value45 Change in tensile strength, % of original value (max.)p20 p20 p20 p206 Change in elongation at break, % of original value (max.)p30 p30 p30 p307 Change in hardness, IRHD+7p3+7p3+7p3+7p3 BSI 2006 5BS F 152:20067.3 Determination o
35、f densityDetermination of the density of the material shall be conducted in accordance with BS 903-A1, Method A.7.4 Determination of tensile strength and elongation at break7.4.1 As manufactured materialDetermination of the tensile strength and elongation at break shall be conducted in accordance wi
36、th BS ISO 37, using Type 2 dumb-bell specimens extracted from the thinner section of the test sheet.7.4.2 Before and after heat ageingDetermination of the effects of heat ageing on the tensile strength and elongation at break shall be conducted in accordance with BS ISO 37, using Type 2 dumb-bell sp
37、ecimens extracted from the thinner section of the test sheet. Tests shall be carried out prior to and after accelerated heat ageing.7.5 Determination of compression setDetermination of compression set shall be conducted in accordance with BS 903-A6, using Type B specimens extracted from the thicker
38、section of the test sheet or on moulded cylindrical buttons. The specimens shall be subjected to (150 2) C for 24 0p2h.7.6 Determination of tear strengthDetermination of tear strength shall be conducted in accordance with BS ISO 34-1, Method C on specimens extracted from the thinner section of the t
39、est sheet.8 Quality of material8.1 Quality assurance documentationQuality assurance documentation for each batch of material or manufactured products shall be in accordance with BS EN 3207.8.2 Rubber products8.2.1 ManufactureRubber products shall be manufactured from material conforming to the requi
40、rements of this specification.BS F 152:20066 BSI 20068.2.2 Sampling8.2.2.1 GeneralThe rate of sampling of products and the method of test shall be agreed between the purchaser and the manufacturer and shall include the following.8.2.2.2 Mechanical propertiesRequirements of tests carried out on test
41、specimens extracted from products shall be agreed between purchaser and manufacturer if not conforming to the requirements of Tables 1 and 2. The type of test specimen and the method of extraction and preparation shall be agreed between purchaser and manufacturer and documented.8.2.2.3 Physical prop
42、ertiesProducts shall be smooth and free from surface imperfections, porosity, voids, inclusions, flow marks or inadequate joint of moulding blank and other defects that would impair satisfactory performance.NOTE Items may be specified with shallow cloth marking on one or more surfaces.8.2.2.4 Chemic
43、al testsAt a frequency agreed between the purchaser and manufacturer, chemical analysis testing shall be carried out to show composition conformance to Clause 4 of this specification.8.2.3 Dimensional propertiesDimensions and tolerances of moulded products and the method of measurement shall be in a
44、ccordance with BS 3734-1 unless otherwise agreed between purchaser and manufacturer.9 Marking, labelling and packaging Packaging and labelling of products shall conform to BS F 69.Products shall be stored in accordance with BS F 68. BSI 2006 7BS F 152:2006Annex A (normative) Manufacture of test shee
45、tManufacture test sheets 250 mm to 300 mm square, (2.00 0.15) mm thick, with a section along one edge 35 mm to 50 mm wide and (6.30 0.15) mm thick.The material shall be vulcanized at a temperature appropriate to the mix for a time appropriate to the thin section of the sheet. No additional vulcanizi
46、ng shall be given to the thicker portion of the sheet.Alternatively, compression set test may be carried out on moulded cylindrical buttons (6.30 0.15) mm thick conforming to the requirements of Type B test pieces as defined in BS 903-A6.Moulded buttons cavities shall be individually charged with pe
47、llets and not filled with excess flow from the remainder of the mould.Nine buttons shall be moulded, grouped at one end of the thick section of the moulded sheet.BS F 152:20068 BSI 2006Bibliography1 SBAC Technical Specification No. 97. Recommended design guide on rubber materials for aerospace mater
48、ials. The Society of British Aerospace Companies Ltd.This page deliberately left blankBS F 152:2006BSI British Standards InstitutionBSI 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 i
49、ncorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical commi
