1、AECMA STANDARD prEN 2795 NORME AECMA Edition P 1 AECMA NORM Aprii 1995 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATERIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 ICs : P. Descriptors : EGLISH VERSION Aerospace series
2、 Fluorocarbon rubber (FPM) .Low compression set Hardness 50 IRHD Srie arospatiale Luft- und Raumfahrt lastomre fluor (FPM) Fluorocarbon-Elastomer (FPM) Faible dformation rmanente aprs compression Duret 50 DIDC niedriger Druckverformungsrest Hrte 50 IRHD This “Aerospace Series Prestandard has been dr
3、awn 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 Committee following comment by the Member countries. Sub
4、sequent 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 AECMA Standard Checking Centre (NPS) and formal a
5、greement 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. - Technopoiis 54 - 199, rue Jean-Jacques Rousseau - 921 38 SSY-LECMOGAUX CEDEX
6、1 _ Comments should be sent within six months after the date of publication to I Edition approved for publication 1995-04-28 AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cedex - FRANCE C 7 Chairman M. Wright aecma 1995 - AECMA PRENx2795 95 B LOL23Ll 0008377 T74 B Des
7、cription block Page 3 prEN 2795 : 1995 Identity block 1 Scope This standard specifies the properties of fluorocarbon rubber (FPM)?), low compression set, hardness 50 IRHD, for aerospace applications. 2 Normative references IS0 1629 Rubber and latices - Nomenclature IS0 1817 EN 3207 Rubber, vulcanize
8、d - 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 as the properties specif
9、ied 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 OC to -F 225 OC - Interm
10、ittent service : from - 20 OC to + 250 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 6 Technical specification EN 3207 1) Symbol as per IS0 1629 2) In preparation at
11、the date of publication of this standard Previous page is blank Hardness IRHD Elongation at break % I I AECMA PREN*K2795 95 I LOL23LL 0008378 900 I -.- Page 4 prEN 2795 : 1995 Table 1 - Test methods 1 2 I I ProDerties I Units Reauirements + 5 “) 50- 4 Densify I Mg/m3 I Tensile strenath I M Pa 8 min.
12、 *) t 6 200 min.) t 9 Modulus at - % strain I M Pa I Tear strenath N/mm I 12 I Resistance to low temperatures TR1 O OC Crvstallization I Point - 12 max. 15.2 Compression set ? after 70 h to 200 OC after - h to - OC % 25 max. *I I 16 Ozone resistance Ozone concentration : ( - f - 1 pphm Time h Elonga
13、tion of test piece: % Temperature 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 :-% Test fluid Time- -h Temperature : - OC Test fluid Humidity :-% 23 24 25 26 27 28 I *I Te
14、st 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/250 OC Tensile strength % - 20 max. compared to the initial value % - 20 max. Elongation at break Hardness IRHD +_5 “1 AECMA PRENu2795 95 8i81 LO
15、L23LL 0008379 847 B Page 5 prEN 2795 : 1995 Table 2 - Tests after exposure to test media - 4 Column Line 5 Liquid B see IS0 1817 Fluid 101 see 1SO 1817 1 Test media Air Conditions of in test media exposure , 2 70 hl23 OC 70 hi200 OC 3 +10 O + 15 O I Mass I % 1 :.5 max. *) Permitted 4 5 variation of the properties 6 7 +5 O -15 8 *) Test for batch acceptance.
