O-ring Material Specification

70 Durometer Buna N (Nitrile)

To meet ASTM D2000 M2Bg714A14B14EA14EF11EF21EO34F17

Basic Requirements Specification 1255
Hardness, points 70+5 71
Tensile strength, min, psi 2031 2175
Ultimate elongation, min, % 250 258
Tear resistance, Kg-cm - 46
Modulus at 100%, psi - 700
Modulus at 200%, psi - 1784
Specific gravity - 1.22
     
Additional Requirements Specification 1255
A14 Heat resistance, Test Method D573, 70h at 100C:
Change in hardness, points - +2
Change in tensile strength, % - +4
Change in ultimate elongation, % - -14
Change in volume, % - -1.2
B14 Compression set, Test Methods D395, Method B, max,%, 22h at 100C: 25 8
EA14 Water resistance, Test Method D471, 70h at 100C:
Change in hardness, points ±10 -3
Change in tensile strength, % - +1
Change in ultimate elongation, % - -6
Change in volume, % ±15 +5.4
EF11 Fluid resistance, Test Method D471, Reference Fuel A, 70h at 23C:
Change in hardness, points ±10 -3
Change in tensile strength, max, % -25 -6
Change in ultimate elongation, max, % -25 -4
Change in volume, % -5 to +10 +2.5
EF21 Fluid resistance, Test Method D471,
Change in hardness, points 0 to -30 -14
Change in tensile strength, max, % -60 -42
Change in ultimate elongation, max, % -60 -38
Change in volume, % 0 to +40 +23.8
EO14 Fluid resistance, Test Method D471, No. 1 Oil, 70h at 100C:
Change in hardness, points -5 to +10 +7
Change in tensile strength, max, % -25 +10
Change in ultimate elongation, max, % -45 -12
Change in volume, % -10 to +5 -9.5
EO34 Fluid resistance, Test Method D471, No. 3 Oil, 70h at 100C:
Change in hardness, points -10 to +5 -2
Change in tensile strength, max, % -45 +6
Change in ultimate elongation, max, % -45 -4
Change in volume, % 0 to +25 +0.8
F17 Low-temperature brittleness, Test Methods D2137, Method A, 9.3.2, nonbrittle after 3 min at -40C pass pass
TR10 Retraction at Lower Temperatures (TR Test), ASTM D1329 – 08, Celcius -29C