1、BRITISH STANDARD AEROSPACE SERIES BS EN 2428:1995 Ethylene-propylene rubber (EPM/EPDM) Hardness 50 IRHD The European Standard EN 2428:1995 has the status of a British Standard ICS 49.040.10BSEN2428:1995 This British Standard, having been prepared under the directionof the Engineering SectorBoard (E/
2、-), was published under the authority of the Standards Board and comes into effect on 15 November1995 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference ACE/25 Draft for comment90/72818 DC ISBN 0 580 24072 X Committees responsible for this British Stand
3、ard The preparation of this British Standard was entrusted to Technical Committee ACE/25, Rubber and elastomeric materials for aerospace purposes, upon which the following bodies were represented: British Adhesives and Sealants Association British Hydromechanics Research Group British Narrow Fabrics
4、 Association British Rubber Manufacturers Association Ltd. Ministry of Defence Society of British Aerospace Companies Limited Amendments issued since publication Amd. No. Date CommentsBSEN2428:1995 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2
5、1 Scope 3 2 Normative references 3 3 Application of the material 3 4 Properties 3 5 Designation 3 6 Technical specification 3 Table 1 Test methods 4 Table 2 Tests after exposure to test media 5 List of references Inside back coverBSEN2428:1995 ii BSI 11-1999 National foreword This British Standard h
6、as been prepared by Technical Committee ACE/25 and is the English language version ofEN2428:1995, Aerospace Series Ethylene-propylene rubber (EPM/EPDM) Hardness50 IRHD, published by the European Committee for Standardization (CEN). EN2428 was produced as a result of international discussion in which
7、 the UnitedKingdom took an active part. The European StandardEN3207, referred to inclause2, is in preparation and there is at present no corresponding British Standard. Preliminary copies of prEN3207 are available from: BNAE, Technopolis54,199 rue Jean Jacques Rousseau,92138 Issy les Moulineaux Cede
8、x, Paris, France. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Public
9、ation referred to Corresponding British Standard ISO 1629:1987 BS 3502 Symbols for plastics and rubber materials Part2:1991 Schedule for symbols for rubbers ISO 1817:1985 BS 903 Physical testing of rubber PartA16:1987 Determination of the effects of liquids Summary of pages This document comprises a
10、 front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 6, an inside back cover and a back cover. This standard 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.EUROPEAN S
11、TANDARD NORME EUROPENNE EUROPISCHE NORM EN2428 September 1995 ICS 49.040.10 Descriptors: Aircraft industry, rubber, ethylene-propylene rubber, hardness English version Aerospace series Ethylene-propylene rubber (EPM/EPDM) Hardness50IRHD Srie arospatiale lastomre thylne-propylne (EPM/EPDM) Duret50 DI
12、DC Luft- und Raumfahrt Ethylen-Propylen-Elastomer (EPM/EPDM) Hrte50 IRHD This European Standard was approved by CEN on1995-03-02. 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 standa
13、rd 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 lan
14、guage 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, Denmark, Finland, France, Germany, Greece, Iceland, Irelan
15、d, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 Copyright reserved to CEN members
16、Ref. No.EN2428:1995 EEN2428:1995 BSI 11-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this Standard has successively received the approva
17、l 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 identical text or by endorsement, at the latest by March1996, and conflict
18、ing national standards shall be withdrawn at the latest by March1996. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Italy, Luxembourg, Netherlands, Norway
19、, Portugal, Spain, Sweden, Switzerland, UnitedKingdom.EN2428:1995 BSI 11-1999 3 1 Scope This standard specifies the properties of ethylene-propylene rubber (EPM/EPDM) 1) , hardness50 IRHD, for aerospace applications. 2 Normative references This European Standard incorporates by dated or undated refe
20、rence provisions from other publications. 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 incorpora
21、ted in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ISO 1629, Rubber and latices Nomenclature. ISO 1817, Rubber, vulcanized Determination of the effect of liquids. EN 3207, Aerospace series Rubber compounds Technical specification 2)
22、. 3 Application of the material The suitability of the material for a specific application shall be determined by complementary tests carried out on the finished product as the properties specified in this standard are obtained from standard test specimens. 3.1 Typical use Application requiring a re
23、sistance to ozone, weather and phosphate ester based hydraulic fluids. NOTEThis material shall not be used for the manufacture of dynamic seals in flight hydraulic systems. 3.2 Temperature range 4 Properties SeeTable 1 andTable 2. For qualification, all tests shall be performed. For batch acceptance
24、, the tests identified inTable 1 andTable 2 shall be performed. 5 Designation 6 Technical specification EN 3207 1) Symbol as per ISO1629 2) In preparation at the date of publication of this standard Continuous service : from 55 C to+125 C Intermittent service : from 55 C to+160 CEN2428:1995 4 BSI 11
25、-1999 Table 1 Test methods Line Column 1 2 3 Properties Units Requirements 1 Hardness IRHD 50 +5 4 *) 2 3 Density Mg/m 3 1) *) 4 5 Tensile strength MPa 9 min. *) 6 7 Elongation at break % 400 min. *) 8 9 Modulus at % strain MPa 10 11 Tear strength N/mm 20 min. 12 13 Resistance to low temperatures TR
26、10 C 35 max. 14 Crystallization Point 15 Compression set 15.1 after 70 h to 100 C % 30 max. *) 15.2 after h to C 16 Ozone resistance Nil cracking Ozone concentration : ( 200 20 ) pphm 17 Elongation of test piece : 20 % Time : 168 h Temperature : 30 C 18 Corrosion and adhesion on metals in a dry atmo
27、sphere 19 Time : h Temperature : C 20 Corrosion and adhesion on metals in a damp atmosphere 20.1 Time : h Temperature : C Humidity : % 20.2 Time : h Temperature : C Humidity : % 21 22 23 24 25 26 27 28 39 30 *) Test for batch acceptance 1) The value determined for each batch shall not differ from th
28、at determined at qualification by more than0.02 Mg/m 3 .EN 2428:1995 BSI 11-1999 5 Table 2 Tests after exposure to test media Line Column 1 2 3 4 5 1 Test media Air Test fluid No.103, seeISO1817 2 Conditions of exposure in test media Units 70h/125 C 24h/100 C 3 Permitted variation of the properties
29、compared to the initial value Volume % +20 0 *) 4 Mass % 5 Tensile strength % 0 20 0 30 6 Elongation at break % 0 20 0 20 7 Hardness IRHD +10 0 0 15 8 *) Test for batch acceptance.6 blankBSEN2428:1995 BSI 11-1999 List of references See national foreword.BS EN 2428:1995 BSI 389 Chiswick High Road Lon
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