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NITRILE RUBBER

DESCRIPTION
On a cost basis, nitrile, or NBR, rubber is the least expensive of the oil resistant elastomers. As a result, nitrile is one of the most widely used rubber materials due to its combination of low cost, resistance to many chemicals, and good physical properties. The acrylonitrile content of this highly polar elastomer provides excellent oil and gas permeation resistance which increases as the level of ACN increases. Unfortunately, an increase in the acrylonitrile content compromises low temperature flexibility, and increases compound hardness. Typical ACN content ranges from 18% to 50%. Nitrile should not be exposed to direct sunlight or moderate to high levels of atmospheric ozone, as rapid deterioration will result. However, NBR will accept many antidegradants, most notably PVC, which offer some degree of improvement of these properties. Nitriles are usually sulfur cured, but peroxide curing is also possible, resulting 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 intended to serve as general guidelines only. Actual testing in the application environment is always recommended.