1、CEN PREN*2428 94 3404589 00bbL38 920 I I 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 921 38 ISSY - LES - MOULINEAUX CEDEX - FRANC
2、E prEN 2428 Edition 1 July 1994 EDITE PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATtRIEL AEROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (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 50 IRHD _ Page 3 prEN 2428 : 1994 CEN PREN*i2428 94 m 3404589 0066339 867 m i Scope This standard specifies the properties of ethylene-propylene rubber (EPM/EPDM) 11, hardness 50 IRHD, for aerospace appl
4、ications. 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
5、or 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. IS0 1629 IS0 181 7 EN 3207 Rubber and latices - Nomenclature Rubber, vulcanized - Determi
6、nation of the effect of liquids Aerospace series - Rubber compounds - 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
7、 standard are obtained from standard test specimens. 3.1 Typical use Application requiring a resistance to ozone, weather 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 - Conti
8、nuous service : from - 55 OC to + 125 OC - Intermittent service : from - 55 OC to + 160 OC 4 Properties See tables 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 I Identity blo
9、ck RUBBER I- I Number of this standard I 6 Technical specification EN 3207 1) Symbol as per IS0 1629 2) In preparation at the date of publication of this standard Previous page is blank CEN PRENJ2428 74 m 3404587 0066340 589 m 20 min. - 35 rnax. Page 4 prEN 2428 : 1994 1 Table 1 - Test methods 2 1 L
10、ine b- Prooerties Units Hardness IRHD E 7 Densitv Ma/m3 Tensile strength M Pa -4001 Elongation at break 1 Modulus at - % strain M Pa Tear strength Resistance to low temoeratures TRI O N/mm OC 15.2 Crvstallization Point % Compression set after 70 h to 100 OC after - h to - OC 30 max. “1 Ozone resista
11、nce Ozone concentration : ( 200 +20 1 pphm Elongation of test piece : 20 % Time 168 h Temperature 30 OC 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 :-% Temperature : - OC H
12、umidity :-% Time : - Oh Nil cracking 20.1 “1 Test for batch acceptance. 1) The value determined for each batch shall not differ from that determined at qualification by more than 0,02 Mgim3. CEN PRENr2428 94 3404589 OObbi141 415 Page 5 prEN 2428 : 1994 Table 2 - Tests after exposure to test media Column Line 1 exposure in test media Volume Permitted variation of the properties compared to the initial value at break Hardness 1 “I Test for batch acceptance. 2 3 4 5
