Also known as butadiene acrylonitrile rubber NBR, NBR for short, average molecular weight of about 700,000. Ash white to pale yellow lumpy or powdery solids, the relative density 0.95~1.0. Glass transition temperature of nitrile rubber with acrylonitrile content 26% Tg= 52, brittleness temperature Tb= 47 c, and glass transition temperature of nitrile rubber with acrylonitrile content 40% Tg= 22 degree Celsius. Solubility parameter δ-=8.9~9.9, soluble in ethyl acetate, butyl acetate, chloro, methyl ethyl ketone, etc. Nitrile rubber with excellent resistance to oil, the oil behind the polysulfide rubber and Viton and with wear resistance and airtightness. Disadvantages of acrylonitrile-butadiene rubber is not resistant to ozone and aromatic solvents, halogenated hydrocarbons, ketones and esters, unfit for the insulating material. Heat resistance is better than rubber, neoprene, 120 ℃ long-term work. Air-tightness after the butyl rubber. NBR's performance under the influence of acrylonitrile content, as the acrylonitrile content increases, tensile strength, heat resistance, oil resistance, tightness, hardness, elasticity, less Hardy. NBR bad ozone resistance and electrical insulation properties. Good water resistance.
Nitrile rubber is mainly used in the production of oil products, resistance tubing, tape, rubber diaphragm and a large oil tank, commonly used in the production of various types of oil-resistant molded products, such as o-rings, oil seals, rubber Cup, diaphragms, valves, bellows, hoses, seals, foam and so on, is used to make plastic and wear-resistant parts.