NBR:Acrylonitrile-Butadiene (NBR)

Copolymers of butadiene and acrylonitrile are known byseveral generic names, Buna N, Nitrile Rubber and NBR. The acrylonitrilecontent of NBR compounds varies considerably (18% to 50%) and influences thephysical properties of the finished material.

The higher the acrylonitrile content, the better theresistance to oil and fuel. At the same time, elasticity and compression setresistance to low temperature is adversely affected. The lower acrylonitrilecontent obtains, the better low temperature resistance, but at a sacrifice tosome resistance to oils and fuels. In view of these opposing realities, acompromise selection is the medium acrylonitrile content rubber. NBR has goodmechanical properties when compared with other elastomers and high wearresistance.

NBR is not resistant to weathering and ozone. Some specialcompounding can improve this defect by the use of a NBR/PVC blending compoundwhich has excellent weathering and ozone resistance and good resistant to fuelbut compression set is not good.

Service Temperature

For NBR the service temperature can be designed from -55 C to 100 C or up to 125 Cdepending on different acrylonitrile content and formula. Generally higher than100 C, life time willbe shortened.

Hardness

40 to 90 Shore A are available.

Color

Black, brown, green, white, rust, yellow, blue, red,orange, and gray are available, or any assigned color from customers.

Application

NBR compounds have excellent resistance to abrasion,non-polar oils and solvent, water and permeation (higher acrylonitrile contentwill be better). NBR also can be used in conditions of dilute acids, alkalisand salt solution at low temperatures. Applications in aromatic hydrocarbons,chlorinated hydrocarbons and polar solvents are not suitable.