Nitrile Rubber (Acrylonitrile Rubber; Acrylonitrile- Butadiene Rubber;
NBR).Nitrile-Butadiene Rubber.
A synthetic rubber made by random polymerization of acrylonitrile with butadiene by free radical catalysis. Alternating copolymers using Natta-Ziegler catalyst have been devel- oped. approximately 20% of the total is used as latex, also available in powder form. Its re- peating structure may be represented as CH2CH=CHCH2CH2CH(CN).
Typical properties: (Medium acrylonitrile): d (polymer) 0.98, tensile strength (psi) 1000- 3000, elongation (%) 100-700, maximum ser- vice temperature 121-148C. Combustible.
Use: (High acrylonitrile): Oil well parts, fuel tank liners, fuel hose, gaskets, packing oil seals, hydraulic equipment
.
(Medium Acrylonitrile): General-purpose oil- resistant applications, shoe soles, kitchen mats, sink topping, and printing rolls.
(Low Acrylonitrile): Gaskets, grommets and O-rings (flexible at a very low temperature), ad- hesives. Fuel binder in solid rocket propellants