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Compressed Air Encyclopedia

Buna-N (Nitrile)
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Buna-N (also know as Nitrile) is the most widely used seal material for compressed air applications.

Buna-N (also know as Nitrile) is the most widely used seal material for compressed air applications.

Buna-N combines working properties such as high tensile strength, high abrasion and tear resistance, and low compression set with a broad temperature range, and excellent resistance to petroleum-based compounds.

Buna-N is comprised of the copolymer butadiene and acrylonitrile. By varying the proportions of the two components, compounds of different characteristics are created.

Increasing the proportion of acrylonitrile gives the compound a higher resistance to petroleum-based fluids and heat, but reduces it’s low temperature performance.

Increasing the proportion of butadiene creates a compound with better low temperature characteristics. Low-temperature Nitrile compounds are those often required by Air Force-Navy (AN) and Military Standard (MS) o-ring specifications.

Applications

  • General compressed air systems
  • Low-temperature military use
  • Off-road equipment
  • Automotive, marine and aircraft fuel systems
  • Certain compounds are FDA approved

Compatibility

  • Generally recommended for:
    • General purpose compressed air systems
    • Petroleum
    • Water
    • Diester
    • Water-Glycol
  • Not recommended for:
    • Applications with direct exposure to sunlight and ozone
    • Highly polar solvents such as acetone, MEK, chlorinated hydrocarbons and nitro hydrocarbons
    • Halogenated hydrocarbons
    • Esters
    • Ethers
    • Ketones
    • Acids
    • Brake Fluid

Specifications

  • Temperature Range: -40°F to 250°F (dry heat)
  • Hardness: 40 – 90 Shore A
  • Trade Names:
    • Chemigum (Goodyear)
    • Hycar (B.F. Goodrich)
    • Krynac (Polysar, Ltd.)
    • Nysyn (Copolymer Rubber)
    • Paracril (Uniroyal)
    • Perbunan(Mobay)
  • ASTM D1418 Designation: NBR
  • ASTM D2000/SAE J200 Type, Class: BF, BG, BK, CH

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