1、BRITISH STANDARD AEROSPACE SERIES BS EN 3050:1998 O-rings, in fluorocarbon rubber(FKM), low compression set Technical specification The European Standard EN 3050:1998 has the status of a British Standard ICS 49.080BSEN3050:1998 This British Standard, having been prepared under the directionof the En
2、gineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15 August 1998 BSI 05-1999 ISBN 0 580 30334 9 National foreword This British Standard is the English language version of EN 3050:1998. The UK participation in its preparation was entrusted to Techn
3、ical Committee ACE/25, Rubber and elastomeric materials for aerospace purposes, to Subcommittee ACE/12/1, Aerospace fasteners present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related
4、international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may
5、be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British St
6、andards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 6 and a back cover. This st
7、andard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN3050:1998 BSI 05-1999 i Contents Page National foreword Inside front cover For
8、eword 2 Text of EN 3050 3 ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3050 May 1998 ICS 49.080 Descriptors: Aircraft industry, O-ring seal, rubber, fluorinated rubber, compression set, hardness, characteristic, specification, quality assurance, acceptance testing, packing English ve
9、rsion Aerospace series O-rings, in fluorocarbon rubber(FKM),low compression set Technical specification Srie arospatiale Joints toriques, en lastomre fluorocarbone (FKM), faible dformation rmanente aprs compression Spcification technique Luff- und Raumfahrt O-Ringe, aus Fluorcarbon-Elastomer (FKM),
10、mit niedrigem Druckverformungsrest Technische Lieferbedingungen This European Standard was approved by CEN on 23 February 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard
11、 without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other langu
12、age made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Ic
13、eland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of ex
14、ploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN3050:1998 EEN3050:1998 BSI 05-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance w
15、ith the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an i
16、dentical text or by endorsement, at the latest by November 1998, and conflicting national standards shall be withdrawn at the latest by November 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europe
17、an Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Quality assura
18、nce 3 5 Requirements 4 Annex A (normative) 6 Table 1 Technical requirements and test methods 4 Table 2 Sampling plans for visual inspections and dimensional characteristics 5 Table 3 Sampling plans for the inspection of physical characteristics 5EN3050:1998 BSI 05-1999 3 1 Scope This standard specif
19、ies the characteristics, qualification and acceptance requirements for o-rings in low compression set fluorocarbon rubber (FKM) to EN 2798. It is applicable whenever referenced. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publication
20、s. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For
21、 undated references the latest edition of the publication referred to applies. ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD). ISO 188, Rubber, vulcanized Accelerated ageing or heat-resistance tests. ISO 1629, Rubber and latices Nomencla
22、ture. ISO 1749, Aircraft Elastomeric sealing rings Packaging and identification. ISO 1817, Rubber, vulcanized Determination of the effect of liquids. ISO 2781, Rubber, vulcanized Determination of density. ISO 2859-1, Sampling procedures and tables for inspection by attributes Part 1: Sampling plansi
23、ndexed by acceptable quality level (AQL) for lot-by-lot inspection. EN 2798, Aerospace series Fluorocarbon rubber (FPM) Low compression set Hardness 80 IRHD 1)2) . EN 3042, Aerospace series Quality assurance EN aerospace products Qualification procedure. EN 3376, Aerospace series Limits of surface i
24、mperfections of elastomeric toroidal sealing rings(o-rings) 1) . ASTM D1414-94, Standard Test Methods for Rubber O-Rings 3) . 3 Definitions For the purposes of this standard, the following definitions apply: 3.1 production batch quantity of o-rings manufactured from the same batch of rubber compound
25、 having the same section diameter vulcanized in the same oven load 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 qua
26、ntity of rubber compound of definite composition which is identifiable, traceable and manufactured in a single production operation 4 Quality assurance 4.1 Qualification EN 3042 Qualification, inspections and tests (requirements and methods) are specified in Table 1. They shall be carried out on: 30
27、 o-rings section diameter d 2= 1,8 mm and inside diameter d 1= 14,0 mm; 30 o-rings section diameter d 2= 3,55 mm and inside diameter d 1= 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
28、 the requirements of Table 1. Characteristics: dimensions and tolerances; hardness; density; compression set (24 h); surface condition; packaging. 1) Published as AECMA Prestandard at the date of publication of this standard 2) FPM, previous designation replaced by FKM, in conformity with ISO 1629 3
29、) Publie par: American Society for Testing and Materials (ASTM), 1916 Race street, Philadephia, PA 19103, tats-UnisEN3050:1998 4 BSI 05-1999 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. C
30、haracteristics: dimensions and tolerances; compression set (24 h); surface condition; packaging. 4.2.2 Responsibility Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibility. 4.2.3 Inspection and test report A test report showing numerical values obtain
31、ed shall be provided together with test results for the batch of rubber compound used. 5 Requirements See Table 1. Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A a Sample size 5.1 Material In accordance with the product standard or de
32、finition document plus approval of the qualifying authority Certificate of compliance issued by the manufacturer of rubber compound Q A 5.2 Dimensions and tolerances In accordance with the product standard or definition document Standard gauging Q See 4.1. A Table 2 5.3 Hardness ISO48 Microtest Q Se
33、e4.1. A Table 3, Column B 5.4 Density EN2798 ISO2781 Q See 4.1. A Table 3, Column A 5.5 Compression set 5.5.1 After 24h at 200 C 25% max. ASTM D1414 Q See 4.1. A Table 3, Column B 5.5.2 After 336h at 200 C 55% max. ASTM D1414 Q See 4.1. 5.6 Resistance to heat ageing After 70h at 250 C Change in hard
34、ness 0IRHD to +5IRHD ISO 188 Q See 4.1. 5.7 Resistance to liquids 5.7.1 After 70h at 23 C in liquid B Change in hardness 0 IRHD to 5 IRHD Change in volume 0% to + 5% ISO 1817 Q 3, see 4.1. Q 3, see 4.1. 5.7.2 After 70h at 200 C in liquid 101 Change in hardness 15 IRHD to 0IRHD Change in volume ISO 1
35、817 Q 3, see 4.1. Q 3, see 4.1. 0% to + 15% 5.8 Surface condition Conform to acceptance document EN 3376 Q See 4.1. A 100% 5.9 Packaging See Annex A. Visual examination A 100% a Q = Qualification, A = Acceptance 80 +54 IRHDEN3050:1998 BSI 05-1999 5 Table 2 Sampling plans for visual inspections and d
36、imensional characteristics Table 3 Sampling plans for the inspection of physical characteristics Production batch size Sample size Acceptance number (Ac) and limiting quality (LQ) in accordance with the acceptable quality level (AQL) AQL 0,065% Ac LQ 10 % # 50 100% 51 to 90 13 G G 91 to 150 20 G G 1
37、51 to 280 32 G G 281 to 500 50 G G 501 to 1 200 80 G G 1 201 to 3200 125 G G 3 201 to 10000 200 0000000000000000000 1,2 10 001 to 35000 315 E E 35 001 to 150000 500 GUse G 150 001 to 500000 800 1 0,5 EUse sampling plan above. GUse sampling plan below. NOTEThe data given in this table are based on si
38、ngle sampling plans for a normal inspection, as specified in ISO 2859-1 (TableII-A and Table VI-A). Other sampling plans specified in ISO 2859-1 may be used (double or multiple sampling), but these shall be chosen in such a way as to ensure an equivalent quality level. Production batch size Sample s
39、ize Non-destructive tests A Destructive tests B Acceptance number (Ac) # 500 8 3 0 501 to 3 200 13 5 0 3 201 to 35 000 20 5 0 $ 35 001 32 8 0EN3050:1998 6 BSI 05-1999 Annex A (normative) A.1Packaging Packaging shall conform to the recommendations of ISO 1749 with the following additional requirement
40、s, except for identification. A.1.1 General O-rings shall be packed individually. The individual packages may be combined in collective packages in the form of strips or collective packages with perforations. These packages shall be water vapour-, ozone-, oil- and greaseproof and shall protect the p
41、roduct against compressive stresses. A.1.2 Material of the individual package The following package materials may be used for the individual packages: opaque polyethylene coated kraft paper; laminate consisting of aluminium, paper and polyethylene; opaque polyethylene film. The use of polyvinyl chlo
42、ride film (PVC film) is not permissible. Transparent or translucent materials shall not be used. A.1.3 Dimensions of the individual packages Depending on the size of the o-ring to be packed the following outside dimensions shall be applied for individual packages: The individual packages shall not b
43、e any larger than necessary. O-rings up to 205 mm internal diameter shall be packed flat (no loops or distortion). A.1.4 Identification Each individual package and each carton shall be legibly marked with not less than the following information: Manufacturers identification; Identity according to th
44、e product standard; Inspection lot number or inspection and test report number; Quarter and year of vulcanization (e.g.3Q93or3T93); UNLIMITED SHELF LIFE; Manufacturing inspection stamp; DO NOT BEND. A.1.5 Collective packaging Packaged o-rings shall be in cartons in such a manner that the o-rings are
45、 not permanently distorted during shipment and storage and be protected against damage from exposure to weather or any other common hazard. 55 mm 55 mm a 205 mm 205 mm a 75 mm 75 mm 255 mm 255 mm a 100 mm l00 mm a 300 mm 300 mm 150 mm 150 mm a 400 mm 400 mm a Sizes in accordance with ISO 1749blankBS
46、 EN 3050:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British
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