1、1 AECMA PREN2308 78 LOL2333 0007734 8 m Approved by COhIiTe DE NORMALISATION Of A.E.C.M.A. 1977-06-24 A.E.C.M.A. STANDARD NORM E A.E .C.M .A. A.E.C.M.A. NORM The equivalent versions in French and German languages can bo supplied by B.N.A.E., 8, rue Moreau-Vauthier 92100 BOULOGNE-BILLANCOURT - FRANCE
2、. DRAFT pr EN 2 108 Edition 1 January 1978 ENGLISH VERSION ACRY LONITRI LE-BUTADI ENE RUBBER (NBR) HARDNESS 80 AEROSPACE SERIES CHAR ACTE R-IST I CS E LASTOM ER E NITRILE ACRYLIQUE-BUTADINE (NBR) DURETE 80 CAR ACTE R ISTI QU ES SERIE AEROSPATIALE CRYLNITRIL-BUTADIEN ELASTOMERE (NBR) HRTE 80 EIGENSCH
3、AFTEN LU FT-UND RAUMFAH RT-REIH E The text of this standard, which exists in three equivalent versions (English, Franch, German) has been drawn up under the responsability of A ECMA (Association Europenne des Constructeurs de Matriel Arospatial) and has been circulated to Official Services. An y res
4、ervations expressed by Official Services and not resolved in this issue, have been incorporated in the history sheet which has accompanied this prEN to CEN. It is published on yellow paper as a draft European Standard intended to receive, under the same presentation and according to its own rules, t
5、he approval of CEN (European Committee for Standardization). 1 I AECMA PREN2308 78 L0323LL 0007735 T M b* prEN2108 page 2 CONTENTS 1 2 REFERENCES 3 CONDITIONS OF USE 4 SCOPE AND FIELD OF APPLICATION REQU I RED C HARACTER I ST I CS 1 2 3 AECMA PREN2108 78 1012311 0007716 1 II DRAFI EUROPEAN STANgARD
6、AEROSPACE SERIES prEN2 108 ACRYLONITRILE-BUTADIENE RUBBER (NBR) HARDNESS 80 CHARACTERISTICS SCOPE AND FIELD OF APPLICATION I prEN2 108 Page 3 This standard specifies the physical-chemical characteristics of acrylonitrile-butadiene rubbers (NBR), hardness 80, for use. in aerospace cons truc t ion, RE
7、FERENCE EN2-O06 - Rubber for aerospace use. Test methods. CONDITIONS OF USE 3.1. Typical use. For use in general purpose application where resistance to petroleum based fluids is required. Note : These materials have poor natural weathering and ozone resistance. . 3.2. Operational temperatures. Cont
8、inuous service : from -40 to +llO“C Intermittent service for certain applications * from -55 to +140“C NOTE - The above temperatures are given as guides in the selection of materials. For specific applications, the limiting performance tempe- ra tures wi 11 require to be de termincd by testing. irEN
9、2108 Page 4 AECMA PREN2108 78 1012311 0007717 3 W 2 3 4 Density, tolerance on type approval value Tensile ctength minimum Elongation at break minimum 5 6 Compression set maximum : 72 hours at 100C Low temperature brittle point maximum 4 REQUIRED CHARACTERISTICS The physical-chemical characteristics
10、are defined in table 1. TABLE 1 - Test procedure, property units, requirements Units and 3ymbols IRHD Method according to 2006 4 Requirement1 values Properties International hardness 15 80 -4 3 3. 0,02 MP a 12 ,o 5 - 5 % 150 7 % 40 9 “C -30 I Resistance to heat ageing Air : 72 hours at 100C I- - Cha
11、nge in hardness I 11 O to .+15 I -20 IRHD - Change in tensile strength maximum 71 11 % 11 -50 I , I - 10 I - Change in elongation at break maximum % 11 I - Change in weight maximurn 1 Resistance to liquids % listilled water : 70 hours at 100C - Change in hardness - 12 -10 to +10 IRHD 12 O to +15 4 -
12、 Change in volume Oil No, 1 : 70 hours at 100C - Change in international hardness % 12 o to +20 IRHD 12 -20 to +10 : - Change in volume Liquid B : 7 days at 23C - Change in volume Liquid A ; 7 days at 23C - Change in volume Test 11 + Drying : 22 hours at 100C - Change in volume maximum % O to +25 12 12 12 % -1 to 110 % -11 Note : Test to be performed by supplier : - Type approval, tests 1 12 - Batch approval tests 1 5 and 10. ILr
