NBR O-Rings

NBR O-Rings


The origin of NBR:

Nitrile-butadiene rubber (NBR) was developed by the chemical company ‘I.G. Farbenindusty’ from Germany between WWI and WWII. At first, the material was called Buna-N® and was later renamed to Perbunan®. The material first came to market in the 30s and is nowadays the most used elastomer for standard seals like Orings and other seals.

What is an O-ring NBR?

An O ring from NBR is an elastomer, which is a synthetic polymer obtained by the copolymerization of acrylonitrile and 1,3-butadiene. The characteristics are partly determined by the amount of acrylonitrile in the material and this varies from 18% to 50%. As the acrylonitrile increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low-temperature flexibility decreases and the rubber can become brittle.

What is NBR used for?

  • Seals
  • O-rings
  • Gaskets
  • Pipe and Cable Covers

The advantages of NBR O-rings:

  • Resistant against oils, fats, hydrocarbons, diluted acids
  • Has good mechanical qualities and is wear-resistant
  • Good resistance to heat
  • It is powerful and elastic
  • It has a working temperature range of -40 °C tot + 130 °C (-30 °F tot + 250 °F)

The disadvantages of Orings NBR:

  • It has limited resistance to weather and ozone conditions
  • Not well resistant to aromatic compounds, halogenated hydrocarbons, ketone brake fluids, and strong acids
  • Must be kept out of direct sunlight
  • The working temperature range is limited in comparison to other materials

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