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Common Name Buna N, Nitrile, NBR
ASTM D-2000 Classification BF, BG, BK
Military (MIL STD 417) SB
Chemical Definition Butadiene Acrylonitrile
General Characteristics
Durometer Range (Shore A) 20 - 95
Tensile Range (P.S.I.) 200 - 3000
Elongation (Max. %) 600
Compression Set Good
Resilience - Rebound Good
Abrasion Resistance Excellent
Tear Resistance Good
Solvent Resistance Good to Excellent
Oil Resistance Good to Excellent
Low Temperature Usage (F°) +30° to -40°
High Temperature Usage (F°) to 250°
Aging Weather - Sunlight Poor
Adhesion to Metal Good to Excellent
Nitrile (Buna-N) is a general purpose oil resistant polymer which has good solvent, oil, water and hydraulic fluid resistance, good compression set, abrasion resistance and tensile strength. Nitrile should not be used in highly polar solvents such as acetone and MEK ozone chlorinated hydrocarbons and nitro hydrocarbons.