NBR (Buna-N) article

NBR - acrylonitrile-butadiene rubber /
trade name e.g. Perbunan® - (Bayer)

NBR is the most common standard material for O-rings because of its good mechanical properties and resistance to mineral oil-based lubricants and greases. These properties are usually determined by the acrylonitrile content (ACN between 18% and 50%). A low ACN content ensures good flexibility at low temperatures, but offers limited resistance to oils and fuels; as the ACN content increases, the low temperature flexibility reduces and the resistance to oils and fuels improves.

The general standard NBR material for O-rings offers an average ACN content to suit a wide range of applications with balanced properties. It has good mechanical-technological values such as high abrasion resistance, as well as low gas permeability and good resistance to mineral oil-based lubricants and greases, hydraulic oils H, H-L, H-LP, non-inflammable pressure liquids HFA, HFB, HFC, aliphatic hydrocarbons, silicone oil and greases, and water to approx. 80ºC.

NBR is generally not resistant to aromatic and chlorinated hydrocarbons, fuels with a high aromatic content, polar solvents, glycol-based brake fluids and non-inflammable hydraulic fluids HFD. It also has a low resistance to ozone, weathering and ageing, but in most applications this has no negative effect.

O-Rings Material

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