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Nitrile / NBR

Nitrile, chemically, is a copolymer of butadiene and acrylonitrile. Acrylonitrile content varies in commercial products from 18% to 50%. As the nitrile content increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases. 

About Nitrile / NBR:

Due to its excellent resistance to petroleum products, and its ability to be compounded for service over a temperature range of -35°C to +120°C (-30°F to +250°F), Nitrile /NBR is the most widely used elastomer in the seal industry today. Also many military rubber specifications for fuel and oil resistant O-rings require nitrile based compounds. It should be mentioned that to obtain good resistance to low temperature, it is often necessary to sacrifice some high temperature resistance. Nitrile compounds are superior to most elastomers with regard to compression set, tear, and abrasion resistance. Nitrile compounds do not possess good resistance to ozone, sunlight, or weather. They should not be stored near electric motors or other ozone generating equipment. 

Nitrile / NBR usage:

They should be kept from direct sunlight. However, this can be improved through compounding. NBR is the standard material for hydraulics and pneumatics. NBR resists oil-based hydraulic fluids, fats, animal and vegetable oils, flame retardant liquids (HFA, HFB, HFC), grease, water, and air. Special low-temperature compounds are available for mineral oil-based fluids. By hydrogenation, carboxylic acid addition, or PVC blending, the nitrile polymer can meet a more specified range of physical or chemical requirements.

The quality of Nitrile-compounds depends on the percentage of acrylonitrile in the base polymer. The following table indicates the change of properties as a function of acrylonitrile content.

Ask ERIKS

For more information on Nitrile / NBR or one of our other o-ring materials please visit our contact page  or fill the “Ask ERIKS” form on the upper-right corner.

Find all suitable chemicals in the Chemical Resistance Guide

Mélange (?) Matériau Dureté IRHD ± 5 Conformités Application Couleur Temp. min. Temp. max sort_index
36624 NBR 70 Logo ADIADILogo REACHREACHLogo RoHSRoHS General purpose Black -30 120 zzzzz
37223 NBR 50 Logo ADIADILogo REACHREACHLogo RoHSRoHS General purpose Black -30 120 zzzzz
44501 NBR 60 Logo ADIADILogo REACHREACHLogo RoHSRoHS General purpose Black -30 120 zzzzz
44601 NBR 80 Logo ADIADILogo REACHREACHLogo RoHSRoHS General purpose Black -30 120 zzzzz
47702 NBR 90 Logo ADIADILogo REACHREACHLogo RoHSRoHS General purpose Black -30 120 zzzzz
366202 NBR 60 Logo EN549 B2 H2EN549 B2 H2Logo ADIADILogo REACHREACH Gas distribution Black -30 120 zzzzz
366221 NBR 70 Logo EN682 GBLEN682 GBLLogo ADIADILogo REACHREACH Gas distribution Black -30 120 zzzzz
366300 NBR 70 Logo EN549 B2 H3EN549 B2 H3Logo ADIADILogo REACHREACH Gas distribution Black -30 120 zzzzz
366470 NBR 70 Logo 3-A3-ALogo FDA 21 CFR 177-2600FDA 21 CFR 177-2600Logo EC1935-2004EC1935-2004 Food and Beverage Black -30 110 zzzzz
366472 NBR 70 Logo FDA 21 CFR 177-2600FDA 21 CFR 177-2600Logo ADIADILogo REACHREACH Food and Beverage White -25 110 zzzzz
366531 NBR 60 Logo NSF61NSF61Logo WRASWRASLogo ADIADI Drinking water Black -30 100 zzzzz
366540 NBR 75 Logo NSF61NSF61Logo WRASWRASLogo ADIADI Drinking water Black -30 120 zzzzz
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