1、BRITISH STANDARD AEROSPACE SERIES BS EN 2431:1995 Ethylene-propylene rubber (EPM/EPDM) Hardness 80 IRHD The European Standard EN 2431:1995 has the status of a British Standard ICS 49.040.10BSEN2431:1995 This British Standard, having been prepared under the directionof the Engineering SectorBoard (E/
2、-), was published under the authority ofthe Standards Board and comes into effect on 15November1995 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/25 Draft for comment 90/79247 DC ISBN 0 580 24090 8 Committees responsible for this BritishStandar
3、d 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 A
4、ssociation British Rubber Manufacturers Association Ltd. Ministry of Defence Society of British Aerospace Companies Limited Amendments issued since publication Amd. No. Date CommentsBSEN2431:1995 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1
5、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 coverBSEN2431:1995 ii BSI 12-1999 National foreword This British Standard has
6、 been prepared by Technical Committee ACE/25, and is the English language version of EN2431:1995, Aerospace Series Ethylene-propylene rubber (EPM/EPDM) Hardness 80 IRHD, published by the European Committee for Standardization (CEN). EN 2431 was produced as a result of international discussion in whi
7、ch the UnitedKingdom took an active part. The European Standard EN 3207, referred to in clause2, is in preparation and there is at present no corresponding British Standard. Preliminary copies of prEN3207 are available from: BNAE, Technopolis54,199rue Jean Jacques Rousseau, 92138 Issy les Moulineaux
8、 Cedex, 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 P
9、ublication referred to Corresponding British Standard ISO 1629:1987 BS 3502 Symbols for plastics and rubber materials Part 2:1991 Schedule for symbols for rubbers ISO 1817:1985 BS 903 Physical testing of rubber Part A16:1987 Determination of the effects of liquids Summary of pages This document comp
10、rises a 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.EUR
11、OPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2431 September 1995 ICS 49.040.10 Descriptors: Aircraft industry, rubber, ethylene-propylene rubber, hardness English version Aerospace series Ethylene-propylene rubber (EPM/EPDM) Hardness 80 IRHD Srie arospatiale lastomre thylne-propylne (EPM/EPDM)
12、Duret 80 DIDC Luft- und Raumfahrt Ethylen-Propylen-Elastomer (EPM/EPDM) Hrte 80 IRHD This European Standard was approved by CEN on 1995-03-02. 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 na
13、tional standard 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
14、any other language 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, Ic
15、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 1995 Copyright reserved t
16、o CEN members Ref. No. EN 2431:1995 EEN2431:1995 BSI 12-1999 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 rece
17、ived 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 identical text or by endorsement, at the latest by March19
18、96, and conflicting 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, Ireland, Italy, Luxemb
19、ourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom.EN2431:1995 BSI 12-1999 3 1 Scope This standard specifies the properties of ethylene-propylene rubber (EPM/EPDM) 1) , hardness 80 IRHD, for aerospace applications. 2 Normative references This European Standard incorporat
20、es by dated or undated reference 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 S
21、tandard only when incorporated 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
22、Technical specification 2) . 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
23、 Application requiring a resistance 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 See Table 1 and Table 2. For qualification, all tests shall be pe
24、rformed. For batch acceptance, the tests identified in Table 1 and Table 2 shall be performed. 5 Designation 6 Technical specification EN 3207 1) Symbol as per ISO 1629 2) In preparation at the date of publication of this standard Continuous service : from 55 C to + 125 C Intermittent service : from
25、 55 C to + 160 CEN2431:1995 4 BSI 12-1999 Table 1 Test methods Line Column 1 2 3 Properties Units Requirements 1 Hardness IRHD 80 *) 2 3 Density Mg/m 3 1) *) 4 5 Tensile strength MPa 12 min. *) 6 7 Elongation at break % 150 min. *) 8 9 Modulus at% strain MPa 10 11 Tear strength N/mm 20 min. 12 13 Re
26、sistance to low temperatures TR10 C 45 max. 14 Crystallization Point 15 Compression set % 15 max. *) 15.1 after 70 hto 100 C 15.2 after hto C 16 17 Ozone resistance Ozone concentration :(200 20) pphm Elongation of test piece : 20 % Nil cracking Time : 168 h Temperature : 30 C 18 19 Corrosion and adh
27、esion on metals in a dry atmosphere 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
28、 shall not differ from that determined at qualification by more than 0,02 Mg/m 3 . + 5 4EN 2431:1995 BSI 12-1999 5 Table 2 Tests after exposure to test media Line Column 1 2 3 4 5 1 Test media Air Test fluid 103 see ISO 1817 2 Conditions of exposure in test media Units 70 h/125 C 24 h/100 C 3 Permit
29、ted variation of the properties compared to the initial value Volume % + 20 0 a 4 Mass % 5 Tensile strength % 25 max. 15 max. 6 Elongation at break % 10 max. 20 max. 7 Hardness IRHD + 10 0 0 20 8 a Test for batch acceptance6 blankBSEN2431:1995 BSI 12-1999 List of references See national foreword.BS
30、EN 2431:1995 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 BritishS
31、tandards are updated by amendment or revision. Users of BritishStandards 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 us
32、ing this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically recei
33、ve the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation
34、of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information s
35、ervices are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For detai
36、ls of these and other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright,
37、 Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the stand
38、ard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
