Nitrile rubber (R)
The term nitrile rubber is used for acrylonitrile-butadiene rubber (NBR). This material has very good engineering properties and is a general-purpose sealing lip material. It is a copolymer manufactured from acrylonitrile and butadiene that provides good resistance to the following media:
- Most mineral oils and greases with a mineral oil base
- Normal fuels like gasoline, diesel and light heating oils
- Animal and vegetable oils and fats and hot water
Nitrile rubber also tolerates short-term dry running of the sealing lip. The permissible operating temperature range of nitrile rubber is –40 to +100 °C (–40 to +210 °F). For brief periods, temperatures of up to 120 °C (250 °F) can be tolerated.
SKF also offers a special nitrile rubber compound with a temperature range between –55 and +110 °C (–65 and +230 °F).