1、BS F 162:2006Properties of elastomeric toroidal sealing rings (“O” rings) manufactured from ethylenepropylene rubber material conforming to BS F 156 SpecificationICS 49.080NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPublishing and copyright informationThe BS
2、I copyright notice displayed in this document indicates when the document was last issued. BSI 2006ISBN 0 580 49381 4The following BSI references relate to the work on this standard:Committee reference ACE/65Draft for comment 05/30130006 DCPublication historyFirst published October 2006Amendments is
3、sued since publicationAmd. no. Date Text affectedBS F 162:2006 BSI 2006 iBS F 162:2006ContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 24 Material 25 Properties 36 Test methods 47 Quality of material 68 Marking, labelling and packaging 6List of tablesTable 1 Tests as manuf
4、actured “O” rings 3Table 2 Tests after immersion in fluid Tri-n-butyl phosphate 4Summary 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 162:2006ii BSI 2006ForewordPublishing informationThis British Standa
5、rd 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 on this committee
6、can be obtained on request to its secretary.Information about this documentThis document supersedes DTD 5608A March 1982, 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 c
7、an 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 preparation of this British Standard that the execut
8、ion 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 expressed in sentences in which the principal auxil
9、iary 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 necessary provisions of a contract. Users are respon
10、sible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. BSI 2006 1BS F 162:20061 ScopeThis British Standard specifies requirements for elastomeric toroidal sealing rings (“O” rings) manufactured from ethylenepropylene rubber material confor
11、ming to BS F 156.This material standard is to be used in conjunction with BS EN 3207 and SBAC TS 49.NOTE Marking BS F 162:2006 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
12、 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 indispensable for the application of his document. For dated referenc
13、es, 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 815), Physical testing of rubber Part A6: Method for determi
14、nation of compression set at ambient, elevated or low temperaturesBS 903-A26 (ISO 48), Physical testing of rubber Part A26: Method for determination of hardness (hardness between 10 IRHDand 100 IRHD)BS 907, Specification for dial gauges for linear measurementBS EN 3207, Rubber compounds Technical sp
15、ecificationBS F 68, Controlled storage of vulcanized rubbers for use in aerospace applicationsBS F 69, Packaging and identification of vulcanized rubber itemsBS F 156, Properties of fluid resistant ethylenepropylene rubber sheet, mouldings and extrusions SpecificationBS M 48, Dimensions of elastomer
16、ic toroidal sealing rings for aerospace use Inch seriesBS ISO 1817, Rubber, vulcanized Determination of the effect of liquidsSBAC TS 49, Elastomeric toroidal sealing rings (“O” rings), manufacturing and inspection standards for aerospace applications. 2nd edition. The Society of British Aerospace Co
17、mpanies Ltd.BS F 162:20062 BSI 20063 Terms and definitionsFor the purpose 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 run3.2 production runcontinuous operation interrupted
18、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 only be made from material conforming to the requirements of BS F 156 and shall be manufactured to issue
19、 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 that the modified product meets all the requirements of the standard.4.2 Classification and grades“O” rings
20、 shall be supplied in three nominal hardness grades: Grade 70; Grade 80; Grade 90.“O” rings 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 hardne
21、ss value. Tolerances if required tighter than those specified within this specification shall not be tighter than 3.NOTE For example, where a hardness of 75 is specified, the requirements of Grade 80 apply as the value of 75 lies within the 71 to 83 hardness range of Grade 80.If a hardness value is
22、so specified by a purchaser, the tolerance shall be taken as +3p9unless a tighter tolerance is agreed between the purchaser and manufacturer. BSI 2006 3BS F 162:20065Properties“O” rings manufactured from material conforming to the relevant grade of BS F 156 shall meet the requirements specified with
23、in the following Tables 1 and 2.The first lot of finished rings from a batch of material mix shall be fully tested in accordance with Tables 1 and 2.Samples from each subsequent lot of finished rings from a batch of material mix shall be tested in accordance with line numbers 1 and 15 of Table 1.Tab
24、le 1 Tests as manufactured “O” ringsBS EN 3207 material standard line numberTest Cross-sectional areammTest requirementGrade 70 Grade 80 Grade 901 Hardness, IRHD1.70 to 2.79 70+3p980+3p990+3p9Over 2.79 70+5p780+5p790+5p723Density, Mg/m3All sections Within 0.02 of requirement within controlling docum
25、entation456789101112131415 Compression set, % (max.)after 24 h compression1.70 to 2.79 25 25 25Over 2.79 20 20 20NOTE Due to differences in measurement and test techniques, the hardness values of “O” rings and sheet material made from the same compound might not necessarily be identical. It is suffi
26、cient, therefore, that the compound from which the “O” rings are made conforms to BS F 156 and it is not essential that the hardness value of the material conforming to BS F 156 matches exactly the hardness value of the “O” rings manufactured from the compoundBS F 162:20064 BSI 20066 Test methods6.1
27、 Fluid immersionTest specimens when required shall be subjected to immersion in tri-n-butyl phosphate test fluid of density 0.975 to 0.976 Mg/m3, refractive index 1.424 to 1.425, and acidity 0.15% max. measured as H3PO4in accordance with BS ISO 1817 for 480p2h at (100 1) C.6.2 Determination of appar
28、ent hardnessDetermination 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 densityDetermination of the density of the “O” rings shall be conducted in accordance with BS 903-A1, Metho
29、d 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 test pieces.Table 2 Tests after immersion in fluid Tri-n-butyl phosphateBS EN 3207 material standard line
30、 numberTest Cross-sectional areammTest requirementGrade 70 Grade 80 Grade 9012 Tests on standard test pieces unless otherwise specified after immersion in fluids according to BS ISO 18173 Permissible variation of the properties compared to the initial valueChange in volume, % (max.)All sections +20
31、+20 +20 BSI 2006 5BS F 162:20066.4.2 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 c
32、ontact member with a flat 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 circul
33、ar contact area of diameter (5 0.05) mm. The gauge shall have a scale graduated in unit divisions of 0.01 mm and shall conform, where relevant, with 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 b
34、etween 2 mm and 6.5 mm diameter 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
35、experience to give consistent 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.)6.4.3 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.BS F 162:20066 BSI 2006The ink or other agent used for marking shall have no deleterious effect on the rub
40、ber and shall be of contrasting 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 ori
41、ginal thickness. The height 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 24 0p2
42、h at a temperature of (100 2) C.NOTE At the test temperature, rubbers conforming to the requirements to this specification might in time cause discoloration, etching or corrosion of the clamping surfaces and these should be periodically cleaned6.5 Determination of volume changeDetermination of the e
43、ffect of volume change of the “O” rings after 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 3207.7.2 “O” rings fr
44、eedom from defects“O” 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 accordan
45、ce with BS M 48 or other approved specification, standard or drawing stated on the order.8 Marking, 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 162:2006BSI Br
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