1、BRITISH STANDARD AEROSPACE SERIES BS EN 3207:1998 Rubber compounds Technical specification The European Standard EN 3207:1998 has the status of a British Standard ICS 49.025.40BSEN 3207:1998 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published
2、underthe authority of the Standards Board and comes intoeffect on 15 July 1998 BSI 04-1999 ISBN 0 580 30137 0 National foreword This British Standard is the English language version of EN3207:1998. The UK participation in its preparation was entrusted to Technical Committee ACE/25, Rubber and elasto
3、meric materials for aerospace purposes, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international a
4、nd European developments and promulgate them in the UK. A list of organizations represented on this committee 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 be found in the BS
5、I 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 Standards are respon
6、sible 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, pagesi andii, theEN title page, pages2to7 and a back cover. This standard has been updated
7、 (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 CommentsBSEN3207:1998 BSI 04-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 3207
8、 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3207 April 1998 ICS 49.025.40 Descriptors: English version Aerospace series Rubber compounds Technical specification Srie arospatiale Matriaux caoutchouc Spcification technique Luft - und Raumfahrt Kautschukmischungen Technische Lieferbe
9、dingungen This European Standard was approved by CEN on 22June1997. 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 without any alteration. Up-to-date lists and bibliographica
10、l 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 language made by translation under the responsibility of a CEN me
11、mber 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, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Port
12、ugal, 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 exploitation in any form and by any means reserved worldwide f
13、or CEN national Members. Ref. No. EN 3207:1998 EEN3207:1998 BSI 04-1999 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 succes
14、sively 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 identical text or by endorsement, at the latest
15、 by October1998, and conflicting national standards shall be withdrawn at the latest by October1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denm
16、ark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the 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 Requirements 4 5 Quality assurance 4 6 Storage of the rubber
17、 compound 4 7 Identification 4 Annex A (informative) 7 Table 1 Test methods 5 Table 2 Tests after exposure to test media 6EN3207:1998 BSI 04-1999 3 1 Scope This standard specifies the requirements for the qualification and batch acceptance of rubber compounds intended for the manufacture of aerospac
18、e parts. 2 Normative references This European Standard incorporates 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 o
19、r revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ISO 34-1, Rubber, vulcanized or thermoplastic Determination of tear strength Part 1: Trous
20、er, angle and crescent test pieces. ISO 37, Rubber, vulcanized or thermoplastic Determination of tensile stress-strain properties. ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between10IRHD and 100IRHD). ISO 188, Rubber, vulcanized Accelerated ageing or heat-resist
21、ance tests. ISO 471, Rubber Standard temperatures, humidities and times for the conditioning and testing of test pieces. ISO 815, Rubber, vulcanized or thermoplastic Determination of compression set at ambient, elevated or low temperatures. ISO 1431-1, Rubber, vulcanized or thermoplastic Resistance
22、to ozone cracking Part 1: Static strain test. ISO 1817, Rubber, vulcanized Determination of the effect of liquids. ISO 2781, Rubber, vulcanized Determination of density. ISO 2921, Rubber, vulcanized Determination of low temperature characteristics Temperature-retraction procedure (TR test). ISO 3387
23、, Rubber Determination of crystallization effects by hardness measurements. ISO 6505, Rubber, vulcanized Determination of adhesion to, and corrosion of, metals. ISO 9002, Quality systems Model for quality assurance in production, installation and servicing. EN 2000, Aerospace series Quality assuranc
24、e EN aerospace products Approval of the quality system of manufacturers. EN 2899, Aerospace series Vulcanized rubbers Tests on the susceptibility to corrosion of metals in contact with vulcanized rubbers in a damp atmosphere 1) . EN 3042, Aerospace series Quality assurance EN aerospace products Qual
25、ification procedure. EN 10204, Metallic products Types of inspection documents. 3 Definitions For the purposes of this standard, the following definitions apply: 3.1 rubber compound a rubber compound is a homogeneous mixture of all the constituents of a rubber formulation, e.g. rubber gumstock, curi
26、ng agents, accelerators, fillers 3.2 batch of rubber compound a batch of rubber compound shall be rubber compound of definite composition which shall be identifiable, traceable and manufactured in a single production operation 3.3 established manufacturer an established manufacturer is a manufacture
27、r who has manufactured products for the aerospace industry for a number of years to recognized national or company aerospace specifications this manufacturer shall have an approval in accordance with EN2000 or ISO9002 or other national or company standards issued by an authorized aerospace company 3
28、.4 established rubber compound an established rubber compound is a rubber compound produced by an established manufacturer to an existing national or company aerospace specification which is accepted as an alternative to the ENmaterial standard 1) In preparation at the date of publication of this st
29、andardEN3207:1998 4 BSI 04-1999 3.5 new manufacturer a new manufacturer is a manufacturer who has not previously manufactured rubber compounds for the aerospace industry and which has no approval from an authorized aerospace company. This manufacturer shall be approved in accordance with EN2000 3.6
30、new rubber compound a new rubber compound is a rubber compound produced by a specific manufacturer, but which has never been qualified by this manufacturer against an existing national or company aerospace specification which is accepted as an alternative to the ENmaterial standard a new rubber comp
31、ound shall be qualified in accordance with EN3042 and this standard 4 Requirements 4.1 Constituents The manufacturer of the rubber compound shall be responsible for the quality of the constituents of the mixture. 4.2 Mixing process The manufacturer of the rubber compound shall prepare and comply wit
32、h a comprehensive mixing process instruction schedule. The reproducibility of the process shall be assured. 4.3 Test pieces Test pieces shall be prepared from vulcanized sheets of appropriate sizes and thicknesses. Where necessary, test pieces may be moulded in a separate operation. Details of the v
33、ulcanization conditions shall be given for all test pieces. 4.4 Conditioning and testing The time interval between vulcanization and testing shall comply with ISO471. The conditioning and testing of the test pieces shall comply with ISO471 at (23 2)C and with ambient relative humidity. 5 Quality ass
34、urance 5.1 Qualification See EN 3042. An established rubber compound shall be qualified by a body mandated by the aerospace industry. For qualification of an established rubber compound, one batch manufactured under production conditions shall be tested. For qualification of a new rubber compound, a
35、 minimum of three batches manufactured under production conditions shall be tested. Testing shall be carried out in accordance with the requirements of the appropriate material standard. The test methods and number of test pieces are listed inTable 1 andTable 2. 5.2 Acceptance Unless otherwise agree
36、d between manufacturer and purchaser all tests identified in the material standard as batch acceptance tests shall be carried out. Nevertheless, the batches supplied shall fulfill all the requirements listed in the material standard. The test methods and number of test pieces are listed inTable 1 an
37、dTable 2. 5.3 Certificate For each batch of rubber compound, a certificate3.1.B according to EN10204 shall be produced (see exampleAnnex A), which shall contain the results of the acceptance tests. This certificate of conformity shall form part of the end product inspection and test report. The cert
38、ificate certifies the conformity of the properties of the rubber compound with the requirements of the material standard. 6 Storage of the rubber compound The rubber compound shall be stored in such a way as to prevent any contamination or deterioration of the material. The environmental conditions
39、for storage (temperature, humidity, etc.) and the storage duration shall be suitable for the rubber compound. 7 Identification All batches of rubber compound shall be identified as follows: reference of material standard; batch number; date of production; number of certificate.EN3207:1998 BSI 04-199
40、9 5 Table 1 Test methods Material standard line number Properties Test methods min. number of test pieces Qualification Acceptance 1 Hardness ISO 48 8mm thick test pieces which may be made by superposing a thickness of 2mm and of 6mm. The 6mm thick sheet shall absorb the pressure from the indenter.
41、3 3 2 3 Density ISO 2781 3 3 4 5 Tensile strength ISO 37 Type 2 test pieces 5 5 6 7 Elongation at break ISO 37 Type 2 test pieces 5 5 8 9 Modulus at . % strain ISO 37 Type 2 test pieces 5 5 10 11 Tear strength ISO 34-1 Method C 5 5 12 13 Resistance to low temperatures TR10 ISO 2921 TR test specimen
42、with length = 100mm initial elongation = 50% 3 3 14 Crystallization ISO 3387 3 3 15 Compression set ISO 815 3 3 16 17 Ozone resistance ISO 1431-1 Method A 3 3 18 19 Corrosion and adhesion on metals in a dry atmosphere ISO 6505 3 3 20 Corrosion and adhesion on metals in a damp atmosphere EN2899A 3 3
43、20.1 20.2 EN 2899BEN3207:1998 6 BSI 04-1999 Table 2 Tests after exposure to test media Material standard line number Properties Test methods min. number of test pieces Qualification Acceptance 1 2 Test on standard test pieces unless otherwise specified after immersion in fluids according to ISO1817
44、or after accelerated temperature ageing according to ISO188 3 Permissible variation of the properties compared to the initial value Volume ISO 1817 Test pieces (50 25 2)mm 3 3 4 Mass 3 3 5 Tensile strength ISO 37 Type 2 test pieces 5 5 6 Elongation at break 5 5 7 Hardness ISO 48 Using a 4mm specimen
45、 consisting of two 2mm sheets 3 3EN3207:1998 BSI 04-1999 7 Annex A (informative) EXAMPLE: Certificate 3.1.B (see EN10204) for rubber compoundsBS EN 3207:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing British
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