ACRYLONITRILE BUTADIENE RUBBER(NBR) (VULCANIZATE PROERTIES (ACN content is…
ACRYLONITRILE BUTADIENE RUBBER(NBR)
Produced via emulsion copolymerization of acrylonitrile and butadiene
five grades based
on the acrylonitrile
very low nitriles: typically 18-20% ACN
Low nitriles: typically 28-29% ACN
Medium nitrile: typically 33-34% ACN
High nitriles: typically 38-39% ACN
Very high nitrile: typically 45-48% ACN
copolymers of butadiene and acrylonitrile
Sulfur donor and peroxidecuring systems are normally used for applications requiring good hightemperature performance and low compression set.
NBR has poor compatibility with natural rubber, but it can be blended with SBR in all proportions
NBR require reinforcing fillers to obtain high strength, because the unfilled vulcanizates do not crystallize on stretching.
highly unsaturated elastomers not inherently ozone resistant
Excellent resistance to solvents, fuels, oils, & greases.
NBR vulcanizates have good physical properties over a wide hardness range
ACN content is increased, the following changes in the vulcanizate properties occur:
– Resistance to petroleum and hydrocarbon fuels increases.
– Rebound resilience decreased.
– Compression set deteriorates.
– Gas permeability decreases.
– Heat resistance improves.
– Ozone resistance improves.
– Abrasion resistance improves.
– Tensile strength increases.
– Hardness and density increases.
for oil and fuel resistant component such as seals, gaskets, diaphragms, hoses and cable jacketing.