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NBR

NBR (Buna-N) is one of the most used elastomeric compounds for O-Rings.

Nitrile rubber (NBR) O-rings, also known as Buna-N, are one of the most widely used sealing elastomers, due to their resistance to petroleum-based fuels and lubricants and their relatively low price.

Acrylonitrile content

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​The acrylonitrile (ACN) content of the polymer chains can vary from 18% to 50%. Lower ACN content gives better low temperature properties but lower resistance to polar fuels and lubricants. Higher ACN content gives lower quality low temperature properties but better resistance to polar fuels and lubricants. Standard NBRs typically have 34% ACN content.

  • Petroleum-based oils and fuels

  • Aliphatic hydrocarbons

  • Vegetable oils

  • Silicone oils and greases

  • Ethylene glycol

  • Diluted acids

  • Water up to 100ºC (212ºF)

  • Strong acids

  • Aromatic hydrocarbons

  • Automotive brake fluid

  • Chlorinated hydrocarbons

  • Ketones, ethers and esters

  • Hydraulic fluids based on phosphoric esters

  • Ozone, atmospheric agents and sunlight

APPLICATIONS

Hydraulic oils and fuels

Pneumatic

Service life extreme

Vacuum

Mechanical Seals

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