Acrylonitrile rubber is copolimer acrylonitrile and butadiene. The ratio of these compounds determines the properties of the vulcanizates, and particularly the oil resisistance or frost resistance. The content of acrylonitrile in the rubber may range from 18% to 50%. As the amount of acrylonitrile is increased resistance to oils and aliphatic solvents, and resistance to high temperatures while reducing the resistance to low temperatures. Acrylonitrile rubber vulcanizates are characterized by high flexibility, tensile strength, low compression set and resistance to oils.
Most of the seals use in hydraulics and pneumatics are based on nitrile rubber.
Temperature range for application is from -30 to +100°C, for short duration increases to 120°C. you can get resistance to -55°C for special execution.
Nitrile Vulcanizates are resistant to:
- aliphatic hydrocarbons such as propane, pure gasoline
- Mineral oils and greases
- oils of vegetable or animal origin
- light fuel oil and diesel fuel
- non-flammable hydraulic fluids such as: HSA, HSB ( oil-water emulsions ) and HSC mixtures of polyethylene with water
- water to 60 ° C ( specific species to +100 ° C)
- dilute acids and bases in very high temperatures
Nitrile vulcanizates are not resistant to:
- chlorinated aromatic hydrocarbons such as benzene, tri, tetra
- esters and polar solvents
- silicone oils and greases
- HSD type of hydraulic fluids (based on polyester and chlorinated hydrocarbons)
- brake fluids based on glycols