1、BS F 159:2006Properties of elastomeric toroidal sealing rings (“O” rings) manufactured from oil resistant silicone rubber material conforming to BS F 153 SpecificationICS 49.080NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPublishing and copyright informationT
2、he BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2006ISBN 0 580 49380 6The following BSI references relate to the work on this standard:Committee reference ACE/65Draft for comment 05/30129999 DCPublication historyFirst published October 2006Amendmen
3、ts issued since publicationAmd. no. Date Text affectedBS F 159:2006 BSI 2006 iBS F 159:2006ContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 24 Material 25 Properties 26 Test methods 47 Quality of material 58 Marking, labelling and packaging 6List of tablesTable 1 Tests as
4、manufactured “O” rings 3Table 2 Tests after immersion in fluid Oil No. 1 3Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover.BS F 159:2006ii BSI 2006ForewordPublishing informationThis British Standard was
5、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 on this committee can be
6、obtained on request to its secretary.Information about this documentThis document supersedes DTD 5605A March 1982, which was declared obsolescent by the Ministry of Defence from 1 April 1999. DTD 5605A Grade 90 has not been included in this standard.Hazard warningsWARNING. This British Standard call
7、s 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 stage.Use of this documentIt has been assumed in the
8、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 in roman (i.e. upright) type. Its requirements are
9、 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 considerationsThis publication does not purport to include all the
10、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 159:20061 ScopeThis British Standard specifies requirements for elastomeric toroidal sealing rings (“O” rings) manufa
11、ctured from oil-resistant silicone rubber material conforming to BS F 153.This material standard is to be used in conjunction with BS EN 3207 and SBAC TS 49.NOTE Marking BS F 159:2006 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of
12、 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 referenced documents are indispensabl
13、e 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: Determination of densityBS 903-A6 (ISO 81
14、5), Physical testing of rubber Part A6: Method for determination of compression set at ambient, elevated or low temperaturesBS ISO 1817, Rubber, vulcanized Determination of the effect of liquidsBS 903-A26 (ISO 48), Physical testing of rubber Part A26: Method for determination of hardness (hardness b
15、etween 10 IRHD and 100 IRHD)BS 907, Specification for dial gauges for linear measurementBS F 68, Controlled storage of vulcanized rubbers for use in aerospace applicationsBS F 69, Packaging and identification of vulcanized rubber itemsBS F 153, Properties of oil resistant silicone rubber sheet, moul
16、dings and extrusions SpecificationBS M 48, Dimensions of elastomeric toroidal sealing rings for aerospace use Inch seriesBS EN 3207, Rubber compounds Technical specificationSBAC TS 49, Elastomeric toroidal sealing rings (“O” rings), manufacturing and inspection standards for aerospace applications.
17、2nd edition. The Society of British Aerospace Companies Ltd.BS F 159:20062 BSI 20063 Terms and definitionsFor the purposes of this British Standard, the following terms and definitions apply.3.1 lot of finished ringsnumber of rings from the same batch of rubber mix cured in the same production run a
18、nd post-cured at the same time and in the same oven3.2 production runcontinuous operation interrupted only by normal working breaks, and may include the concurrent or consecutive operation of different moulds to produce rings of different sizes4Material4.1 Manufacturing controlSealing rings shall on
19、ly be made from material conforming to the relevant grade of BS F 153 and shall be manufactured to issue controlled documentation, which shall form part of the contract between purchaser and manufacturer.Changes to the manufacturing process shall not be made without due consideration being given tha
20、t the modified product meets all the requirements of the standard.4.2 Classification and grades“O” rings shall be supplied in three nominal hardness grades: Grade 60; Grade 70; Grade 80.“O” rings manufactured to nominal hardness grades other than those specified shall, with the exception of hardness
21、, meet all the requirements of this specification specified for the grade embracing the nominal 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
22、 70 apply as the value of 65 lies within the 61 to 73 hardness range of Grade 70.If a hardness value is so specified by a purchaser, the tolerance shall be taken as +39unless a tighter tolerance is agreed between the purchaser and manufacturer.5 Properties“O” rings manufactured from material conform
23、ing to the relevant grade of BS F 153 shall meet the requirements specified within the following Table 1 and Table 2.The first lot of finished rings from a batch of material mix shall be fully tested in accordance with Table 1 and Table 2.Samples from each subsequent lot of finished rings from a bat
24、ch of material mix shall be tested in accordance with line numbers 1 and 15 of Table 1. BSI 2006 3BS F 159:2006Table 1 Tests as manufactured “O” ringsBS EN 3207 material standard line numberTest Cross-sectional area mmTest requirementGrade 60 Grade 70 Grade 801 Hardness, IRHD 1.70 to 2.70 60+3970+39
25、80+39Over 2.79 60+5770+5780+5723Density, Mg/m3All sections Within 0.05 of requirement within controlling documentation.456789101112131415 Compression set, % (max.)a) after 24 h compression1.70 to 2.79 20 25 25Over 2.79 15 20 20NOTE Due to differences in measurement and test techniques, the hardness
26、values of “O” rings and sheet material made from the same compound might not necessarily be identical. It is sufficient, therefore, that the compound from which the “O” rings are made conforms to BS F 153 and it is not essential that the hardness value of the material conforming to BS F 153 matches
27、exactly the hardness value of the “O” rings manufactured from the compound.Table 2 Tests after immersion in fluid Oil No. 1BS EN 3207material standard line numberTest Cross-sectional areammTest requirementGrade 60 Grade 70 Grade 8012 Tests on standard test pieces unless otherwise specified after imm
28、ersion in fluids according to BS ISO 18173 Permissible variation of the properties compared to the initial valueChange in volume, % (max.)All sections +15 +15 +15BS F 159:20064 BSI 20066 Test methods6.1 Fluid immersionTest specimens, when required, shall be subjected to immersion in the fluid for 48
29、20h at (125 1) C in accordance with BS ISO 1817.6.2 Determination of apparent hardness of as manufactured “O” ringsDetermination of the apparent hardness of “O” rings shall be conducted in accordance with BS 903-A26 except that wax shall not be used to locate the “O” rings. 6.3 Determination of dens
30、ityDetermination of the density of the “O” rings shall be conducted in accordance with BS 903-A1, Method A.6.4 Determination of compression set6.4.1 GeneralDetermination of compression set shall be conducted in accordance with BS 903-A6 with the following modifications due to the use of “O” ring tes
31、t pieces.6.4.2 Thickness gaugesThe thickness of the test piece shall be determined using one of the following measuring instruments.a) An electronic thickness comparator firmly held in a rigid stand over a flat base of not less than 50 mm in any direction, and having a moving contact member with a f
32、lat circular contact area of diameter (5 0.05) mm. The force exerted by the moving contact member shall be (0.85 0.03) N.b) A dial gauge firmly held in a rigid stand above a flat base of not less than 50 mm in any direction, and having a moving contact member with a flat circular contact area of dia
33、meter (5 0.05) mm. The gauge shall have a scale graduated in unit divisions of 0.01 mm and shall conform, where relevant, to the requirements of BS 907. The force exerted by the moving contact member shall be (0.85 0.03) N.c) A precision micrometer having parallel anvils of between 2 mm and 6.5 mm d
34、iameter used as a “go/no go” gauge, the distance between the anvils being set such that the test piece when inserted between the anvils gives barely perceptible friction. This method, whilst capable of being used to the required degree of accuracy, does require some operator experience to give consi
35、stent and accurate results.All instruments shall be capable of measuring to an accuracy of 0.005 mm. (Note that this applies to the instruments only, not to their capability of measuring “O” ring cross-sections.) BSI 2006 5BS F 159:20066.4.3 Test piecesIn the case of sealing rings having an internal
36、 diameter of 13 mm or greater, the test piece shall consist of a section approximately 25 mm in length cleanly cut from a ring by straight cuts across the cord of the ring. In the case of sealing rings having an internal diameter of less than 13 mm, the test piece shall be a whole ring vented by a s
37、ingle cut through the cord section. The variation in cord diameter along the length of the test piece shall not exceed 2% of the nominal cord diameter.Three test pieces shall be used for each determination.6.4.4 Measurement of test piecesThe cord diameter of each test piece shall be measured at a ma
38、rked point approximately midway along its length, the measurement being made across the cord diameter at right angles to the plane of the ring (designated “W” in BS M 48). If an instrument with a moving contact member is used, the axis of movement shall be vertical and in line with the dimension bei
39、ng measured.The measurement shall be taken as the original test piece thickness (tc). The thickness of the test piece after recovery (tr) shall be measured in a similar manner at the same point.The ink or other agent used for marking shall have no deleterious effect on the rubber and shall be of con
40、trasting colour to that of the rubber. It shall be so applied that it does not come into contact with the plates when the “O” rings are under compression.6.4.5 SpacersThe spacer(s) shall be chosen so the each test piece shall be compressed to a value (ts) of (75 2)% of its original thickness. The he
41、ight of the spacers shall be measured to an accuracy of 0.01 mm.Where more than one spacer is used in the same test apparatus space, they shall not vary in thickness by more than 0.01 mm.Test pieces shall not be lubricated.The duration of the compression period shall be 2420h at (150 2) C.NOTE At th
42、e test temperature, rubbers conforming to the requirements to this specification can, in time, cause discoloration, etching or corrosion of the clamping surfaces and these should be periodically cleaned.6.5 Determination of volume changeDetermination of the effect of volume change of “O” rings after
43、 immersion in fluids shall be conducted in accordance with BS ISO 1817.7 Quality of material7.1 Quality assurance documentationQuality assurance documentation for each batch of “O” rings manufactured shall be in accordance with BS EN 3207.BS F 159:20066 BSI 20067.2 “O” rings freedom from defects“O”
44、rings shall be uniform in quality and condition, clean, smooth and free from foreign matter and imperfections detrimental to performance of the part as defined in SBAC TS 49.7.3 “O” rings dimensional propertiesDimensions and tolerances of finished “O” rings shall be in accordance with BS M 48.8 Mark
45、ing, labelling and packagingPackaging and labelling of “O” rings shall be in accordance with BS F 69.Products shall be stored in accordance with BS F 68.This page deliberately left blankBS F 159:2006BSI British Standards InstitutionBSI is the independent national body responsible for preparing Briti
46、sh Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated 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
47、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 committee responsible, the identity of which can be found on the inside front cover
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