1、BRITISH STANDARDBS EN 3747:2007Aerospace series O-rings, in fluorosilicone rubber (FVMQ) Technical specificationThe European Standard EN 3747:2007 has the status of a British StandardICS 49.025.40g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g
2、38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3747:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007ISBN 978 0 580 53955 8National forewordThis British Standard i
3、s the UK implementation of EN 3747:2007. It supersedes BS EN 3747:2003 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can be obtained on request to
4、 its secretary.This 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.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN
5、 STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3747June 2007ICS 49.025.40 Supersedes EN 3747:2003 English VersionAerospace series - O-rings, in fluorosilicone rubber (FVMQ) -Technical specificationThis European Standard was approved by CEN on 11 September 2003.CEN members are bound to comply with the CEN
6、/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to
7、any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.C
8、EN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Swe
9、den, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref
10、. No. EN 3747:2007: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Quality assurance5 5 Requirements.6 Annex A (normative) Packaging 8 EN 3747:20073 Foreword This document (EN 3747:2007) has been prepared by the Aerospace and Defence Industries Association
11、 of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This Europ
12、ean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2007, and conflicting national standards shall be withdrawn at the latest by December 2007. Attention is drawn to the possibility that some of the el
13、ements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 3747:2003. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
14、 countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia
15、, Spain, Sweden, Switzerland and the United Kingdom. EN 3747:20074 1 Scope This standard specifies the characteristics, qualification and acceptance requirements for O-rings in fluorosilicone rubber (FVMQ) to EN 3825, EN 3826 and EN 3827, for aerospace applications. It is applicable whenever referen
16、ced. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 48, Rubber, vulca
17、nized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD). ISO 188, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests. ISO 1749, Aircraft Elastomeric sealing rings Packaging and identification. ISO 1817, Rubber, vulcanized Determination o
18、f the effect of liquids. ISO 2781, Rubber, vulcanized Determination of density. ISO 2859-1, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection. EN 3376, Aerospace series Limits of surface imperfections of elas
19、tomeric toroidal sealing rings (o-rings). 1)EN 3825, Aerospace series Fluorosilicone rubber (FVMQ) Hardness 60 IRHD.1)EN 3826, Aerospace series Fluorosilicone rubber (FVMQ) Hardness 70 IRHD. 1)EN 3827, Aerospace series Fluorosilicone rubber (FVMQ) Hardness 80 IRHD. 1)EN 9133, Aerospace series Qualit
20、y management systems Qualifiation procedure for aerospace standard parts. ASTM D 1414-94, Standard test methods for rubber O-rings. 2) 3 Terms and definitions For the purposes of this standard the following terms and definitions apply. 3.1 production batch quantity of O-rings manufactured from the s
21、ame batch of rubber compound having the same section diameter vulcanized in the same oven load 1) Published as ASD Prestandard at the date of publication of this standard. 2) Published by: American Society for Testing and Materials (ASTM), 1916 Race street, Philadelphia, PA 19103, USA. EN 3747:20075
22、 3.2 inspection lot quantity of O-rings from a single production batch with the same part number which completely defines them 3.3 rubber compound a homogeneous mixture of all constituents for a rubber 3.4 batch of rubber compound quantity of rubber compound of definite composition which is identifi
23、able, traceable and manufactured in a single production operation 4 Quality assurance 4.1 Qualification EN 9133 Before any particular compound can be used to manufacture O-rings to this technical specification it shall have received qualification approval by satisfying the qualification authority th
24、at it will meet all the requirements of EN 3825, EN 3826 and EN 3827. Qualification, inspections and tests (requirements and methods) are specified in Table 1. They shall be carried out on: 30 O-rings section diameter d2= 1,8 mm and inside diameter d1= 14,0 mm; 30 O-rings section diameter d2 = 3,55
25、mm and inside diameter d1= 26,5 mm. 4.2 Acceptance 4.2.1 Conditions From every batch of rubber compound, samples from the first inspection lot of O-rings shall be tested for compliance with the requirements of Table 1. Characteristics: dimensions and tolerances; hardness; density; compression set (2
26、4 h); surface condition; packaging. From all other inspection lots of O-rings from the same production batch, samples of O-rings shall be tested for compliance with the requirements of Table 1. Characteristics: dimensions and tolerances; compression set (24 h); surface condition; packaging. 4.2.2 Re
27、sponsability Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibility. EN 3747:20076 4.2.3 Inspection and test report A test report showing numerical values obtained shall be provided together with test results for the batch of rubber compound used. 5 Re
28、quirements See Table 1. Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A a Sample size Q 5.1 Material In accordance with the product standard or definition document plus approval of the qualifying authority Certificate of compliance iss
29、ued by the manufacturer of rubber compound A Q See 4.1. 5.2 Dimensions and tolerances In accordance with the product standard or definition document Standard gauging A Table 2 Q See 4.1. 5.3 Hardness IRHD4560+IRHD4570+IRHD4580+ISO 48 Microtest A Table 3, Column B Q See 4.1. 5.4 Density Permissible d
30、eviation from compound qualification value 0,03 Mg/m3ISO 2781 A Table 3, Column A Q See 4.1. 5.5 Compression set After 24 h at 150 C 25 % max. ASTM D 1414 A Table 3, Column B Q See 4.1. 5.6 Resistance to heat ageing After 70 h at 200 C Change in hardness 5 IRHD to 10 IRHD Change in weight 2 % max. I
31、SO 188 5.7 Resistance to liquids 5.7.1 After 70 h at 23 C in liquid B ISO 1817 Q 3 Change in hardness 20 IRHD to 0 IRHD Q 3 Change in volume 0 % to 25 % 5.7.2 After 70 h at 150 C in liquid 101 ISO 1817 Q 3 Change in hardness 5 IRHD to 12 IRHD Q 3 Change in volume 0 % to 12 % Q See 4.1. 5.8 Surface c
32、ondition Conform to acceptance document EN 3376 A 100 % 5.9 Packaging See Annex A. Visual examination A 100 % aQ: Qualification, A: Acceptance. EN 3747:20077 Table 2 Sampling plans for visual inspections and dimensional characteristics Batch size Sample size Acceptance number (Ac) and limiting quali
33、ty (LQ10) in accordance with the acceptance quality limit (AQL) AQL 0,065 % Ac LQ10% 50 51 to 90 91 to 150 151 to 280 281 to 500 501 to 1 200 1 201 to 3 200 3 201 to 10 000 10 001 to 35 000 35 001 to 150 000 150 001 to 500 000 100 % 013 020 032 050 080 125 200 315 500 800 0 1 1,140 0,485 Use samplin
34、g plan above. Use sampling plan below. The data given in this Table are based on single sampling plans for a normal inspection, as specified in ISO 2859-1, Tables 2-A and 6-A. Other sampling plans specified in ISO 2859-1 may be used (double or multiple sampling), but these shall be chosen in such a
35、way as to ensure an equivalent quality limit. Table 3 Sampling plans for the inspection of physical characteristics Sample size Acceptance number Batch size Non-destructive testsA Destructive tests B (Ac) 500 501 to 3 200 3 201 to 35 000 35 001 08 13 20 32 3 5 5 8 0 0 0 0 EN 3747:20078 Annex A (norm
36、ative) Packaging A.1 General Packaging shall conform to the recommendations of ISO 1749 with the following additional requirements, except for identification. O-rings shall be packed individually. The individual packages may be combined in collective packages in the form of strips or collective pack
37、ages with perforations. These packages shall be water vapour-, ozone-, oil- and greaseproof and shall protect the product against compressive stresses. A.2 Material of the individual package The following package materials may be used for the individual packages: opaque polyethylene coated kraft pap
38、er; laminate consisting of aluminium, paper and polyethylene; opaque polyethylene film. The use of polyvinyl chloride film (PVC film) is not permissible. Transparent or translucent materials shall not be used. A.3 Dimensions of the individual packages Depending on the size of the O-ring to be packed
39、 the following outside dimensions shall be applied for individual packages: 55 mm 55 mm 3)205 mm 205 mm 3)75 mm 75 mm 255 mm 255 mm 3)100 mm 100 mm 3)300 mm 300 mm 150 mm 150 mm 3)400 mm 400 mm The individual packages shall not be any larger than necessary. O-rings up to 205 mm internal diameter sha
40、ll be packed flat (no loops or distortion). 3) Sizes in accordance with ISO 1749. EN 3747:20079 A.4 Identification Each individual package and each carton shall be legibly marked with not less than the following information: Manufacturers identification; Identity according to the product standard; I
41、nspection lot number or inspection and test report number; Quarter and year of vulcanization (e.g. 3Q02 or 3T02); UNLIMITED SHELF LIFE; Manufacturing inspection stamp; DO NOT BEND. A.5 Collective packaging Packaged O-rings shall be in cartons in such a manner that the O-rings are not permanently dis
42、torted during shipment and storage and are protected against damage from exposure to weather or any other common hazard. EN 3747:2007BS EN 3747:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards.
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