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Products » Materials » Rubber » Nitrile Rubber
 

NITRILE RUBBER

DESCRIPTION
Based on cost, nitrile rubber (or NBR) is the least expensive of all oil resistant elastomers. Given its low cost, resistance to many chemicals, and good physical properties, nitrile is one of the most popular rubber materials. The acrylonitrile content of this highly polar elastomer offers outstanding oil and gas permeation resistance, which also increases as the ACN level increases. Unfortunately, increased acrylonitrile content compromises low temperature flexibility while it increases compound hardness. Typical ACN content ranges between 18% to 50%. Nitrile should not be exposed to moderate to high levels of atmospheric ozone or direct sunlight, which results in rapid deterioration. However, NBR accepts many antidegradants, notably PVC, which offer a degree of improvement of these properties. Nitriles are typically sulfur cured, but peroxide curing is possible as well, which results in improved compression set.
COMPOSITION
Medium density copolymer of butadiene and acrylonitrile

PHYSICAL PROPERTIES* Excellent Good Fair Poor
Abrasion resistance      
Compression set      
Elongation      
Flame resistance      
Gas permeability      
Low temperature flexibility      
Tear resistance      
Tensile strength    

CHEMICAL RESISTANCE* Excellent Good Fair Poor
Brake fluid      
Dilute acids      
Dilute alkalis      
Hydraulic fluids      
Ketones      
Ozone      
Petroleum oils      
Silicone fluids      
Steam      
Strong acids      
Transmission fluids      
Water      
Weather      

OPERATING TEMPERATURE
-30 to 250 °F

*Excellent, good, fair and poor are general guidelines only. Actual testing in the application environment is always recommended.