1、CEN PRENr2431 94 H 3404589 0066150 428 Edition approved for publication 1994-07-25 AECMA STANDARD NORME AECMA AECMA NORM The equivalent versions in French and German languages can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau 92138 ISSY - LES - MOULINEAUX CEDEX - FRANCE p
2、rEN 2431 July 1994 Edition 1 EDITE PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATERIEL AEAOSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - TISI. (1 1 47.36.98.76 UDC : 678.074 : 620.1 : 629.7 Descriptors : Aircraft industry, rubber, ethylene-propylene
3、 rubber, hardness ENGLISH VERSION Aerospace series Ethylene-propylene rubber (EPM/EPDM) Hardness 80 IRHD Srie arospatiale Luft- und Raumfahrt lastomre thylne-propylne (EPMIEPDM) Ethylen-Propylen-Elastomer (EPM/EPDM) Duret 80 DIDC Hrte 80 IRHD This “Aerospace series“ Standard has been drawn up under
4、the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on yellow paper in three equivalent versions (English, French, German). It will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. CEN
5、PREN*i2433 74 3404587 0066353 364 Page 3 prEN 2431 : 1994 1 Scope This standard specifies the properties of ethylene-propylene rubber (EPMIEPDM) 11, hardness 80 IRHD, for aerospace applications. 2 Normative references This European Standard incorporates by dated or undated reference provisions from
6、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 incorporated in it by amendment
7、 or revision. For undated references the latest edition of the publication referred to applies. IS0 1629 IS0 181 7 EN 3207 Rubber and latices - Nomenclature Rubber, vulcanized - Determination of the effect of liquids Aerospace series - Rubber compounds - Technical specification 2) 3 Application of t
8、he 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 resistance to ozone, w
9、eather and phosphate ester based hydraulic fluids. NOTE : This material shall not be used for the manufacture of dynamic seals in flight hydraulic systems. 3.2 Temperature range - Continuous service : from - 55 OC to + 125 OC - Intermittent service : from - 55 OC to + 160 OC 4 Properties See tables
10、1 and 2. For qualification, all tests shall be performed. For batch acceptance, the tests identified in tables 1 and 2 shall be performed. 5 Designation Description block RUBBER Identity block EN2431 Number of this standard I 6 Technical specification EN 3207 1) Symbol as per IS0 1629 2) In preparat
11、ion at the date of publication of this standard Previous page is blank - CEN PREN*2433 94 3404589 0066352 2TO = Page 4 prEN 2431 : 1994 Teble 1 - Test methods 1 3 Reauirements ProDerties Units - _ Hardness + 5 “) 80- 4 IRHD Mahn3 Densitv E 12 min. *) Tensile strength MPa % 150 min. *) Elonaation at
12、break Modulus at - % strain MPa 11 Tear strength N/mm 20 min. I 12 OC Point Resistance to low temperatures TR10 Crvstallitation - 45 max. - Compression set 15 max. “1 after 70 h to 100 OC % after - h to - OC Ozone resistance Ozone concentration : ( 200 120 1 pphm Time 168 h Elongation of test piece
13、: 20 % Temperature 30 OC Nil cracking 20.1 Corrosion and adhesion on metals in a dry atmosphere Time :-h Temperature : - OC Corrosion and adhesion on metals in a damp atmosphere Time :-h Temperature : - OC Humidity :-% 1 20.2 Time * - Oh Temperature : - OC Humidity :-% *) Test for batch acceptance.
14、1) The value determined for each batch shall not differ from that determined at qualification by more than 0,02 Mg/m3. CEN PREN*243II 94 3404589 00bbL53 II37 = Page 5 prEN 2431 : 1994 Table 2 - Tests after exposure to test media 1 I Test media Conditions of exposure in test media T Volume Per rn it ted variation of the properties compared to the initial value Tensile Hardness 3 *I 1 Units 70 h/125 OC I 961 - O - 25 IRHD 4 Test fluid No. 103, see IS0 1817 24 h/100 OC +20 *) O O -15 O - 20 O - 20 - 5 “1 Test for batch acceptance.
