NBR Nitrile

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

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About 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. 

NBR applications

NBR parts 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.

Datasheets NBR

The table below shows the available datasheets for this material in pdf. Safety datasheets are available here.

Ask ERIKS

For more information on Nitrile / NBR or one of our other o-ring materials please contact one of the ERIKS Sealing & Polymer locations or fill in the form below.

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Difference between NBR Nitrile rubber and HNBR hydrogenated Nitrile rubber

Nitrile rubber is made from butadiene and acrylonitrile by lotion polymerization. Nitrile rubber is mainly produced by low-temperature lotion polymerization. It has excellent oil resistance, high abrasion resistance, good heat resistance and strong adhesion. Its disadvantages are poor low temperature resistance, ozone resistance, poor insulation performance, and poor elasticity. Nitrile rubber is mainly used to manufacture oil resistant rubber products. NBR, abbreviated as NBR, is a synthetic rubber produced by copolymerization of butadiene and acrylonitrile. It is a synthetic rubber with good oil resistance and aging resistance. The content of acrylonitrile (%) in Nitrile rubber is 42~46, 36~41, 31~35 and 25~30. The higher the content of acrylonitrile, the better the oil resistance, and the corresponding decrease in cold resistance. It can be used for a long time in air at 120 &#; or in oil at 150 &#;. In addition, it also has good water resistance, air tightness, and excellent bonding performance. So it is widely used in the manufacturing of various oil resistant rubber products, various oil resistant washers, gaskets, sleeves, soft packaging, soft rubber pipes, cable adhesive materials, etc., and has become an essential elastic material in industries such as automobiles, aviation, and petroleum.

Hydrogenated Nitrile rubber (HNBR) is a highly saturated elastomer obtained by special hydrogenation of Nitrile rubber. Hydrogenated Nitrile rubber has good oil resistance; And due to its highly saturated structure, it has good heat resistance, excellent chemical corrosion resistance, excellent ozone resistance, and high resistance to compression permanent deformation; At the same time, hydrogenated Nitrile rubber also has high strength, tear resistance, wear resistance and other characteristics, and is one of the rubber with excellent comprehensive performance.

Compared with Nitrile rubber, hydrogenated Nitrile rubber has better heat resistance, higher tensile strength, low temperature resistance of -50 &#;, and good comprehensive performance. Conventional nitrile rubber can be used at a temperature of 100 &#;, while special formulas can be used at 150 &#;; The conventional use temperature of hydrogenated Nitrile rubber is 150 &#;, which can be made higher, depending on the formula and raw rubber.

Comparison: hydrogenated Nitrile rubber is generally applicable to the temperature range of -40 to 170 &#;; Service temperature of Nitrile rubber: 0-100 &#;;

HNBR150 &#; environment can be used for a long time without stickiness, hardening and cracking, while Nitrile rubber cannot

BOSS make and supply NBR o-rings and HNBR o-rings both and other difference HNBR products,please just send your inquiry to  directly.

Contact us to discuss your requirements of Nitrile rubber NBR. Our experienced sales team can help you identify the options that best suit your needs.