1、BS F 157:2006Properties of high tear strength silicone rubber sheet, mouldings and extrusions 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 indica
2、tes when the document was last issued. BSI 2006ISBN 0 580 49387 3 The following BSI references relate to the work on this standard:Committee reference ACE/65Draft for comment 05/30130031 DCPublication historyFirst published October 2006Amendments issued since publicationAmd. no. Date Text affectedBS
3、 F 157:2006 BSI 2006 iBS F 157:2006ContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 24 Material 25 Properties 36 Test sheet manufacture 67 Test methods 68 Quality of material 99 Marking, labelling and packaging 9AnnexesAnnex A (normative) Manufacture of test sheet 10Biblio
4、graphy 11List of tablesTable 1 Tests as moulded material 4Table 2 Modulus rigidity test at low temperature 4Table 3 Tests after long term exposure to heat ageing 5Table 4 Tests after short term exposure to heat ageing 5Table 5 Tests after immersion in fluid Oil No. 1 6Table 6 Tests after immersion i
5、n fluid Liquid 101 6Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 11 and a back cover.BS F 157:2006ii BSI 2006ForewordPublishing informationThis British Standard was published by BSI and came into effect on 31 October 2006. It was prepared b
6、y 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 on this committee can be obtained on request to its secretary.Information about this documentThis do
7、cument supersedes DTD 5615A July 1981, which was declared obsolescent by the Ministry of Defence from 1 April 1999.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
8、technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage.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
9、people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented 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 pr
10、esented in smaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis 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
11、immunity from legal obligations. BSI 2006 1BS F 157:20061 ScopeThis British Standard specifies requirements for silicone rubber material with excellent ozone resistance properties intended for the production of items such as sheet, mouldings and certain extrusions for use where high tear strength is
12、 of prime importance over a temperature range of 60 C to 150 C1).For applications in contact with air, the material may be suitable for use up to 250 C. However, considerable reduction in tear strength can occur when these materials are exposed above 150 C for other than short periods of time.NOTE 1
13、 Materials and products manufactured from this material are unsuitable for use in contact with petroleum based fuels, light mineral oils and greases made from them and phosphate esters.NOTE 2 Where prolonged contact with heavy mineral or di-ester based liquids are required, use should be made of mat
14、erial conforming to the requirements of BS F 153.NOTE 3 Further information on the suitability of silicone rubber for design applications can be found in SBAC Technical Specification No. 97 1.NOTE 4 Marking BS F 157:2006 on or in relation to a product represents a manufacturers declaration of confor
15、mity, 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 responsibility. Such a declaration is not to be confused with third party certification of conformity.2 Normative referencesThe following
16、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) applies.BS 903-A1 (ISO 2781), Physical testing of rubber Part A1: Dete
17、rmination 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-A13 (ISO 1432), Physical testing of rubber Part A13, Method for determination of stiffness at low temperature (Gehman tests)BS 903-A
18、26 (ISO 48), Physical testing of rubber Part A26: Method for determination of hardness (hardness between 10 IRHD and 100 IRHD)1)High tear strength silicone rubber products, when properly stored at room temperature and in the absence of hostile environments, deteriorate very slowly and, for most prac
19、tical purposes, the storage life 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
20、 depends on the useful life required.BS F 157:20062 BSI 2006BS 903-A29 (BS ISO 2921), Physical testing of rubber Part A29: Determination of low temperature characteristics Temperature-retraction procedure (TR test).BS 3734-1 (ISO 3302-1), Rubber Tolerances for products Part 1: Dimensional tolerances
21、BS EN 3207, Rubber compounds Technical specificationBS F 68, Controlled storage of vulcanized rubbers for use in aerospace applicationsBS F 69, Packaging and identification of vulcanized rubber itemsBS ISO 34-1, Rubber, vulcanized or thermoplastic Determination of tear strength Part 1: Trouser, angl
22、e 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, vulcanized or thermoplastic Accelerated ageing and heat resistance testsBS ISO 1817, Rubber, vulcanized Determination of the effect of
23、 liquids3 Terms and definitionsFor the purposes of this British Standard, the following terms and definitions apply3.1 polymermaterial formed by joining together many (poly) individual units (mer) of one or more monomers3.2 vulcanizationthermosetting reaction involving the use of heat and pressure,
24、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 the requirements of this specification. No reclaimed or grou
25、nd 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 the contract between purchaser and manufacturer.Changes to the
26、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. BSI 2006 3BS F 157:20064.3 Classification and gradesMaterial shall be supplied in three nominal hardness grades: Grade 50; Grade
27、 60; Grade 70.Material 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 nominal hardness value. Tolerances, if required tighter than those spec
28、ified 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. 5 PropertiesMaterial manufactured in accordance with Annex A shall meet the r
29、equirements specified within Tables 1, 2, 3, 4, 5 and 6.To show conformance to the requirements of this specification the first production batch and every subsequent 10th batch of material shall be tested in accordance with: material standard line numbers 1, 3, 5, 7, 11 and 15 of Table 1; material s
30、tandard line numbers 5, 6 and 7 of Table 4; material standard line numbers 3 and 7 of Table 6.All other batches of material shall be tested in accordance with material standards line number 1, 3, 11 and 15 of Table 1.BS F 157:20064 BSI 2006Table 1 Tests as moulded materialBS EN 3207 material standar
31、d line numberTest Test requirementGrade 50 Grade 60 Grade 701 Hardness, IRHD 50+5p460+5p470+5p423Density, Mg/m3Within 0.03 of requirement within controlling documentation.45 Tensile strength, MPa (min.) 8.0 7.5 7.567 Elongation at break, % (min.) 500 400 350891011 Tear strength, N/mm (min.) 30 30 30
32、1213 Resistance to low temperature TR 10, C (max.)p55 p55 p551415 Compression set, % (max.) 25 25 25Table 2 Modulus rigidity test at low temperatureBS EN 3207 material standard line numberTest Test requirementGrade 50 Grade 60 Grade 70Temperature at which rigidity modulus does not exceed 70 MPa, Cp5
33、5 p55 p55NOTE Test specified in Table 2 is an alternative test method to Table 1 line 13. However, in cases of dispute, Table 1 line 13 test method shall be used. BSI 2006 5BS F 157:2006Table 3 Tests after long term exposure to heat ageingBS EN 3207 material standard line numberTest Test requirement
34、Grade 50 Grade 60 Grade 7012 Tests on standard test pieces unless otherwise specified after accelerated temperature ageing according to BS ISO 1883 Permissible variation of the properties compared to the initial value45 Change in tensile strength, % of original value (max.)p50 p50 p506 Change in elo
35、ngation at break, % of original value (max.)p65 p65 p657 Change in hardness, IRHD+15p5+15p5+15p5Table 4 Tests after short term exposure to heat ageingBS EN 3207 material standard line numberTest Test requirementGrade 50 Grade 60 Grade 7012 Tests on standard test pieces unless otherwise specified aft
36、er accelerated temperature ageing according to BS ISO 1883 Permissible variation of the properties compared to the initial value45 Change in tensile strength, % of original value (max.)p50 p50 p506 Change in elongation at break, % of original value (max.)p65 p65 p657 Change in hardness, IRHD+10p5+10
37、p5+10p5BS F 157:20066 BSI 20066 Test sheet manufactureManufacture 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 heat ageing 7.1.1 Long term ageingTest specimens, when required, shal
38、l be subjected to accelerated temperature ageing in accordance with BS ISO 188 for (1 000 2) h at (175 2) C.Table 5 Tests after immersion in fluid Oil No. 1BS EN 3207 material standard line numberTest Test requirementGrade 50 Grade 60 Grade 7012 Tests on standard test pieces unless otherwise specifi
39、ed after immersion in fluids according to BS ISO 18173 Permissible variation of the properties compared to the initial valueChange in volume, % (max.) +10 +10 +1045 Change in tensile strength, % of original value (max.)p40 p40 p406 Change in elongation at break, % of original value (max.)p40 p40 p40
40、7 Change in hardness, IRHD (max.) p15 p15 p15Table 6 Tests after immersion in fluid Liquid 101BS EN 3207 material standard line numberTest Test requirementGrade 50 Grade 60 Grade 7012 Tests on standard test pieces unless otherwise specified after immersion in fluids according to BS ISO 18173 Permiss
41、ible variation of the properties compared to the initial valueChange in volume, % (max.) +30 +30 +3045 Change in tensile strength, % of original value (max.)p40 p40 p406 Change in elongation at break, % of original value (max.)p40 p40 p407 Change in hardness, IRHD (max.) p25 p25 p25 BSI 2006 7BS F 1
42、57:20067.1.2 Short term ageingTest specimens, when required, shall be subjected to accelerated temperature ageing in accordance with BS ISO 188 for (96 2) h at (225 2) C.7.2 Fluid immersion7.2.1 Oil No. 1Test specimens, when required, shall be subjected to immersion in the fluid in accordance with B
43、S ISO 1817 for (168 2) h at (125 1) C.7.2.2 Liquid 101Test specimens, when required, shall be subjected to immersion in the fluid in accordance with BS ISO 1817 for (168 2) h at (125 1) C.7.3 Determination of hardness tests7.3.1 As manufactured materialDetermination of hardness shall be conducted in
44、 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 test. 7.3.2 Before and after heat ageingDetermination of the effects of heat ageing on the hardness of the material shall be con
45、ducted 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 to and after accelerated heat ageing.7.3.3 After immersion in fluidsDetermination of the effects of immersion in fluids on the h
46、ardness 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 to and after accelerated heat ageing.7.4 Determination of densityDetermination of the densit
47、y of the material shall be conducted in accordance with BS 903-A1, Method A.7.5 Determination of tensile strength and elongation at break7.5.1 As manufactured materialDetermination of the tensile strength and elongation at break shall be conducted in accordance with BS ISO 37 using Type 2 dumb-bell
48、specimens extracted from the thinner section of the test sheet.BS F 157:20068 BSI 20067.5.2 Before and after heat ageingDetermination of the effects of heat aging on the tensile strength and elongation at break shall be conducted in accordance with BS ISO 37 using Type 2 dumb-bell specimens extracte
49、d from the thinner section of the test sheet. Tests shall be carried out prior to and after accelerated heat aging.7.5.3 After immersion in fluidsDetermination of the effects of immersion in fluids on the tensile strength and elongation at break shall be conducted in accordance with BS ISO 37 using Type 2 dumb-bell specimens extracted from the thinner section of the test sheet. Tests shall be carried out prior to and after accelerated
