Nitrile (NBR)

Nitrile rubber (NBR), or Acrylonitrile Butadiene Rubber, is the compound of choice where resistance to fuels, oils, and chemicals is critical. Mountville Rubber’s NBR formulations are commonly used in gaskets, seals, hoses, and isolators that operate in petroleum-rich or chemically aggressive environments. With excellent abrasion resistance and mechanical strength, NBR ensures reliable service life in automotive, industrial, and heavy-equipment applications.

Available in sheets, slabs, and strips.

 

Abbreviation:

NBR

ASTM D-2000 Classification:

BF, BG, BK

Chemical Definition:

Acrylonitrile Butadiene

 

Physical & Mechanical Properties

  • Durometer or Hardness 20 - 95 Shore A
  • Tensile Strength 200 - 3500 PSI
  • Elongation % 350% - 650%
  • Abrasion Resistance Good to Excellent
  • Adhesion to Metal Excellent
  • Adhesion to Rigid Materials Good to Excellent
  • Compression Set Good to Excellent
  • Flex Cracking Resistance Fair to Good
  • Impact Resistance Fair to Good
  • Resilience/Rebound Good
  • Tear Resistance Good to Excellent
  • Vibration Dampening Fair to Good

Thermal Properties

  • Low Temperature -70° F to 0° F
  • Minimum for Continuous Use (static) -40° F
  • Brittle Point -70° F to 0° F
  • High Temperature +210° F to 250° F
  • Maximum for Continuous Use (static) +250° F

Environmental Performance

  • Colorability Excellent
  • Flame Resistance Poor
  • Gas Permeability Fair to Excellent
  • Odor Good
  • Ozone Resistance Fair to Good
  • Oxidation Resistance Good
  • Radiation Resistance Fair to Good
  • Steam Resistance Fair to Good
  • Sunlight Resistance Poor to Good
  • Taste Retention Fair to Good
  • Weather Resistance Fair to Good
  • Water Resistance Good to Excellent

Chemical Resistance

  • Acids, Dilute Good
  • Acids, Concentrated Poor to Fair
  • Acids, Organic (Dilute) Good
  • Acids, Organic (Concentrated) Poor
  • Acids, Inorganic Fair to Good
  • Alcohols Fair to Good
  • Aldehydes Fair to Poor
  • Alkalies, Dilute Good
  • Alkalies, Concentrated Poor to Good
  • Amines Poor
  • Animal & Vegetable Oils Good to Excellent
  • Brake Fluids, Non-Petroleum Based Poor
  • Diester Oils Fair to Good
  • Esters, Alkyl Phosphate Poor
  • Esters, Aryl Phosphate Poor to Fair
  • Esters Poor
  • Fuel, Aliphatic Hydrocarbon Good to Excellent
  • Fuel, Aromatic Hydrocarbon Fair to Good
  • Fuel, Extended (Oxygenated) Fair to Good
  • Halogenated Solvents Poor
  • Hydrocarbon, Halogenated Poor to Fair
  • Ketones Poor
  • Lacquer Solvents Fair
  • LP Gases & Fuel Oils Excellent
  • Mineral Oils Excellent
  • Oil Resistance Good to Excellent
  • Petroleum Aromatic Good
  • Petroleum Non-Aromatic Excellent
  • Refrigerant Ammonia Good
  • Refrigerant Halofluorocarbons R-11, R-12, R-13
  • Refrigerant Halofluorocarbons with Oil R-11, R-12
  • Silicone Oil Good
  • Solvent Resistance Good to Excellent

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