Acrylonitrile-Butadiene (NBR) / 丁腈橡膠

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

higher the acrylonitrile content, the better the resistance to oil and fuel. At the same time, elasticity and compression set resistance to low temperature is adversely affected. The lower acrylonitrile content obtains, the better low temperature resistance, but at a sacrifice to some resistance to oils and fuels. In view of these opposing realities, a compromise selection is the medium acrylonitrile content rubber. NBR has good mechanical properties when compared with other elastomers and high wear resistance.

NBR is not resistant to
weathering and ozone. Some special compounding can improve this defect by the use of a NBR/PVC blending compound which has excellent weathering and ozone resistance and good resistant to fuel but compression set is not good.

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

40 to 90 Shore A are available.

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

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


丁腈橡膠是由丙烯腈与丁二烯共聚合而成,丙烯腈含量由18-50%,丙烯腈含量愈高,對石化油品碳氫燃料油之低抗性愈好,但低溫性能則變差,一般使用溫度范圍為 -25℃+120℃。丁腈膠為目前油封及O型圈最常用之橡膠材料之一,因為這物料具有良好的抗油,抗水,坑高壓油的特性。