Nitrile is the most widely used elastomer in the seal industry. The popularity of nitrile is due to its excellent resistance to petroleum products and its ability to be compounded for service over a temperature range of -22°F to 212°F.
Nitrile is a copolymer of butadiene and acrylonitrile. Variation in proportions of these polymers is possible to accommodate specific requirements. An increase in acrylonitrile content increases resistance to heat plus petroleum base oils and fuels but decreases low temperature flexibility. Military AN and MS O ring specifications require nitrile compounds with low acrylonitrile content to insure low temperature performance.
Nitrile provides excellent compression set, tear, and abrasion resistance. The major limiting properties of nitrile are its poor ozone and weather resistance and moderate heat resistance, but in many applications these are not limiting factors.
O-rings, rubber seals and custom moulded rubber components for:
Oil resistant applications
Low temperature applications
Fuel systems, automotive, marine, and aircraft
General Industrial Use
excellent compression set,
superior tear resistance
poor weather resistance
moderate heat resistance
acrylonitrile content (ACN) from 18% to 50%
peroxide vs. sulphur donor cure system
XNBR improved wear resistance formulation
NBR NSF standard 61 for potable water applications
NBR WRc, KTW water applications
NBR FDA white list compounds
|General Description||Chemical Description||ISO/DIN 1629||Other Trade names & Abbreviations||ASTM D2000 Designations|
|Nitrile (NBR)||Acrylonitrile-butadiene rubber||NBR||Buta-N||BF, BG, BK, CH|
|Temperature Range (Dry Heat)||Low||High|
|Fahrenheit||- 22 °F||212 °F|
|Celsius||- 30 °C||100 °C|