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Nitrile Polymer, also known as Buna N is a synthetic rubber, copolymer of acrylonitrile (ACN) and butadiene. Physical and chemical properties of Nitrile rubber varies depending on ACN content. Higher the ACN content, better resistance to oils, fuels and other chemicals but lower the flexibility. It is used in the automotive and aerospace industry to make fuel and oil handling hoses, seals and grommets since ordinary rubbers cannot be used.

Nitrile Polymer Information and Specs
General Information
  • Common Name: Nitrile, Buna-N, NBR
  • Chemical Name: Acrylonitrile-butadiene
  • Generally Resistant To: Gases, Aliphatic Hydrocarbon, Oils and Fuels
  • Generally Attacked By: Ketones, Ozone, Sunlight, Aromatic Oil, Flame, Weather
  • ASTM D 2000 / SAE J200 Classification: BF, BG, BK, CH
  • MIL-R-3065 / SAE J-14 / MIL-STD-417 Classification: SB
  • MIL-R-6855 Class 1
Physical Properties
  • Elongation: 200% to 600%
  • Hardness Range (Durometer Shore A): 35 to 90
Mechanical Properties
  • Compression Set: Good
  • Rebound Rating: Fair to Good
  • Flex Cracking Resistance: Good
  • Abrasion Resistance: Good to Excellent
  • Tear Resistance: Good
  • Impact Resistance: Fair to Good
  • Flame Resistance: Poor
Thermal Properties
  • Minimum Service Temperature: -30°F to -70°F
  • Maximum Service Temperature: +220°F to +280°F
Environmental Resistance
  • Recommended Shelf Life: 5 to 10 years
  • Weather Resistance: Poor
  • Sunlight Resistance: Poor
  • Ozone Resistance: Poor
  • Oxidization Resistance: Good
  • Water Resistance: Good to Excellent
  • Steam Resistance: Fair
  • Gas Permeability: Fair to Good