1、I -.- . 3 AECMA PRENa279b 95 B LOL231L 0008380 569 AECMA STANDARD NORME AECMA AECMA NORM prEN 2796 Edition P 1 April 1995 DITE PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 ICs
2、 : Descriptors : EflGLISH VERSION Aerospace series Fluorocarbon rubber (FPM) Low compression set Hardness 60 IRHD Srie arospatiale lastomre fluor (FPMI Faible dformation rmanente aprs compression Duret 60 DIDC Luft- und Raumfahrt Fluorocarbon-Elastomer (FPM) niedriger Druckverformungsrest Hrte 60 IR
3、HD This Aerospace Series I Prestandard has been drawn up under the responsibility of AECMA Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committ
4、ee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the
5、AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. . Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue
6、Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULJNEAUX CEDEX I Commenks should be sent within six months after the date of oublication to I Edition approved for publication AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cedex - FRANCE 1995-04-28 C 7 Chairman M. Wright I t
7、aecma 195 AECMA PRENa279b 95 BI 10123LL 0008381 4T5 U Page 3 prEN 2796 : 1995 1 Scope This standard specifies the properties of fluorocarbon rubber (FPM), low compression set, hardness 60 IRHD, for aerospace applications. L 2 Normative references IS0 1629 Rubber and latices - Nomenclature IS0 1817 E
8、N 3207 Rubber, vulcanized - Determination 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
9、as the properties specified in this standard are obtained from standard test specimens. 3.1 Typical use Application requiring a resistance to air, hydrocarbon and synthetic oils, fuels at elevated temperature and low compression set properties. 3.2 Temperature range - Continuous service : from - 20
10、OC to + 225 OC - Intermittent service : from - 20 OC to + 250 OC 4 Properties See tables i 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 EN2796 I Number of
11、 this standard 1 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 AECMA PREN*i2776 75 H LOL23LL 0008382 333 H 4 5 G Tensile strength 12 13 14 Resistance to low temperatures TR10 Crvstallization Page 4 prE
12、N 2796 : 1995 Table 1 - Test methods 1 Prooerties 3 2 Units Reauirementc r 1 Hardness IRHD I t 2 I t 3 Density I 1) *) Mg/m3 M Pa 10 min. *) 7 I Elongation at break 8 % 180 min.*) 9 1 Modulus at - % strain 10 -, M Pa t 11 I Tear strength N/mm OC Point - 12 max. 1 ;ial I Compression set after 70 h to
13、 200 OC 15.2 after - h to - OC % 25 max. * 16 I Ozone resistance Ozone concentration : t Elongation of test piece : Time Temperature f- 1 PPhm % h OC 17 Corrosion and adhesion on metals in a dry atmosphere Time -h Temperature : - oc 19 20 Corrosion and adhesion on metals in a damp atmosphere Time -h
14、 Temperature : - oc Humidity -% Test fluid Time :-h Temperature : - oc Humidity - Yo 20.1 20.2 I Test fluid - 21 LL 23 24 - 25 I 26 29 I 30 *) Test for batch acceptance. 1) The value determined for each batch shall not differ from that determined at qualification by more than 0,03 Mg/m3. Units 70 h/
15、250 OC % % % - 5 max. “1 - 20 max. - 20 max. AECMA PREN*Z?Yb 95 ssl LOL2311 0008383 278 Page 5 prEN 2796 : 1995 Table 2 - Tests after exposure to test media 4 5 Liquid B see IS0 1817 Fluid 101 see IS0 181 7 1 Test media Conditions of exposure in test media 70 hl23 OC 70 hl200 OC %I - +10 O Volume +15 O 31 I Mass 4 I Permitted 5 variation of the properties Tensile strength Elongation at break compared to the initial value 71 Hardness + O -15 rl.5 81 I *) Test for batch acceptance.
