1、BS F 164:2006Properties of elastomeric toroidal sealing rings (“O” rings) manufactured from fluorosilicone rubber material conforming to BS F 154 SpecificationICS 49.080NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPublishing and copyright informationThe BSI c
2、opyright notice displayed in this document indicates when the document was last issued. BSI 2006ISBN 0 580 49382 2The following BSI references relate to the work on this standard:Committee reference ACE/65Draft for comment 05/30130011 DCPublication historyFirst published October 2006Amendments issue
3、d since publicationAmd. no. Date Text affectedBS F 164:2006 BSI 2006 iBS F 164:2006ContentsForeword 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 manufact
4、ured “O” rings 3Table 2 Tests after immersion in fluid Test liquid B 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 164:2006ii BSI 2006ForewordPublishing informationThis British Standard was publ
5、ished 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 obta
6、ined on request to its secretary.Information about this documentThis document supersedes DTD 5616 January 1979, 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 inju
7、rious 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 execution of its
8、 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 auxiliary verb
9、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 responsible for
10、its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. BSI 2006 1BS F 164:20061 ScopeThis British Standard specifies requirements for elastomeric toroidal sealing rings (“O” rings) manufactured from fluorosilicone rubber material conforming to BS F
11、154.This material standard is to be used in conjunction with BS EN 3207 and SBAC TS 49.NOTE Marking BS F 164:2006 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 stand
12、ard. 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 references, only the
13、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 determination of com
14、pression 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 IRHD and 100 IRHD)BS 907, Specification for dial gauges for linear measurementBS EN 3207, Rubber compounds Technical specificationB
15、S F 68, Controlled storage of vulcanized rubbers for use in aerospace applicationsBS F 69, Packaging and identification of vulcanized rubber itemsBS F 154, Properties of fluorosilicone rubber sheet, mouldings and extrusions SpecificationBS M 48, Dimensions of elastomeric toroidal sealing rings for a
16、erospace 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 applicationsBS F 164:20062 BSI 20063 Terms and definitionsFor the purpose of this British Sta
17、ndard, 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 and post-cured at the same time and in the same oven3.2 production runcontinuous operation interrupted only by normal working breaks, and may i
18、nclude 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 154 and shall be manufactured to issue controlled documentation, which shall f
19、orm 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 requirement of the standard.4.2 Classification and grades“O” rings shall be supplied in three nominal hardn
20、ess grades: Grade 60; Grade 70; Grade 80.“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 hardness value. Tolerances, if required tighter
21、 than those specified within this specification, shall not be tighter than 3.NOTE For example, where a hardness of 68 is specified, the requirements of Grade 70 shall apply as the value of 68 lies within the 58 to 75 hardness range of Grade 70.If a hardness value is so specified by a purchaser then
22、the tolerance will be taken as +3p9unless a tighter tolerance is agreed between the purchaser and manufacturer. BSI 2006 3BS F 164:20065Properties“O” rings manufactured from material conforming to the relevant grade of BS F 154 shall meet the requirements specified within the following Tables 1 and
23、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.Table 1 Tests as manufactured “O”
24、 ringsBS EN 3207 material standard line numberTest Cross-sectional areammTest requirementGrade 60 Grade 70 Grade 801 Hardness, IRHD 1.70 to 2.79 60+5p1270+5p1280+5p12Over 2.79 60+5p1070+5p1080+5p1023Density, Mg/m3All sections Within 0.05 of requirement within controlling documentation456789101112131
25、415 Compression set, % (max.) after 24 h compressionAll sections 20 25 25NOTE 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 sufficient, therefore, that the compound from
26、 which the “O” rings are made conforms to BS F 154 and it is not essential that the hardness value of the material conforming to BS F 154 matches exactly the hardness value of the “O” rings manufactured from the compound.BS F 164:20064 BSI 20066 Test methods6.1 Fluid immersionTest specimens, when re
27、quired, shall be subjected to immersion in the fluid for 480p2h at (40 1) C in accordance with BS ISO 1817.6.2 Determination of apparent 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” ri
28、ngs. The test pieces shall be conditioned before test by heating in air at (200 2) C for 60+50min and allowed to cool to room temperature in a desiccator. Rings used to determine hardness shall not be used for other tests required by this specification.6.3 Determination of densityDetermination of th
29、e 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 test pieces.Table 2 Tes
30、ts after immersion in fluid Test liquid BBS EN 3207 material standard line numberTest Cross-sectional areammTest requirementGrade 60 Grade 70 Grade 8012 Tests on standard test pieces unless otherwise specified after immersion in fluids according to BS ISO 18173 Permissible variation of the propertie
31、s compared to the initial value.Change in volume, %1.70 to 2.79+300+300+250Over 2.79+250+250+250 BSI 2006 5BS F 164:20066.4.2 Thickness gaugesThe thickness of the test piece shall be determined using one of the following measuring instruments.a) An electronic thickness comparator having a fixed cont
32、act member with horizontal dimensions of not less than 50 mm in any direction, and having a moving contact member with a contact foot not less than 2 mm nor more than 4 mm in diameter, both members having flat surfaces parallel to one another. The moving member shall exert a force of not less than 0
33、.15 N nor more than 0.22 N per millimetre of the diameter of the foot.b) A dial gauge having fixed and moving contact members as described in a), the moving member being loaded such as to exert a force of not less than 0.15 N nor more than 0.22 N per millimetre of the diameter of the foot. The gauge
34、 shall have a scale graduated in unit divisions of 0.01 mm and shall conform, where relevant, to the requirements of BS 907.c) A precision micrometer having parallel anvils of between 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 pi
35、ece 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 consistent and accurate results.All instruments shall be capable of measuring to an accuracy of 0.005 mm
36、. (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 diameter of 13 mm or greater, the test piece shall consist of a section approximately 25 mm in length cleanly cut from a r
37、ing 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 single cut through the cord section. The variation in cord diameter along the length of the test piece shall not exceed 2% o
38、f 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 marked point approximately midway along its length, the measurement being made across the cord diameter at right angles to th
39、e 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 being measured.The measurement shall be taken as the original test piece thickness (tc). The thickness of the test piece after
40、 recovery (tr) shall be measured in a similar manner at the same point.BS F 164:20066 BSI 2006The ink or other agent used for marking shall have no deleterious effect on the rubber and shall be of contrasting colour to that of the rubber. It shall be so applied that it does not come into contact wit
41、h 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 height of the spacers shall be measured to an accuracy of 0.005 mm.Where more than one spacer is used
42、in the same test apparatus space, they shall not vary in thickness by more than 0.005 mm.Test pieces shall not be lubricated.The duration of the compression period shall be 24 0p2h at a temperature of (150 2) C.NOTE At the test temperature, rubbers conforming to the requirements to this specificatio
43、n might, 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 the “O” rings after immersion in fluids shall be conducted in accordance with BS ISO 1817.7
44、 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 Quality assurance testing“O” rings shall only be manufactured from material compounds conforming to BS F 154.7.3 “O” rings freedo
45、m 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 49.7.4 “O” rings dimensional propertiesDimensions and tolerances of finished “O” rings shall be in accordance w
46、ith 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 164:2006BSI Britis
47、h 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 incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of Britis
48、h 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 te
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