NBR (Nitrile Rubber / BUNAN)

Characteristics
Nitrile rubber is a copolymers of butadiene and acrylonitrile. Acrylonitrile content varies from18% to 50% and influences the physical properties of the finished material.
As the acrylonitrile increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases. As the acrylonitrile decreases, low temperature flexibility increases, but resistance to petroleum base oils and hydrocarbon decreases. A compromised selection is the medium acrylonitrile content rubber. Nitrile rubber is superior to most elastomers with regard to compression set, tear, and abrasion resistance.
Nitrile compounds do not possess good resistance to ozone, sunlight, or weather. However, this can be improved through compounding. By NBR/PVC blending, the nitrile polymer can reach a better range of weathering, ozone, hydrocarbon fuel resistance, but compression set is not well.

Service Temperature
NBR can be compounded for service over a temperature range of -25℃ to 100℃or up to 125℃. Generally, the service life will be shortened when the temperature is over 100℃. Through special compounding the temperature range could reach -50 to 150℃.

Hardness
40 to 90 Shore A are available.

Color
Black, brown, green, white, rust, yellow, blue, red, orange, and gray are available, or any assigned color from customers.

Application
NBR compounds have excellent abrasion, non-polar oils and solvent, water and permeation (better with high acrylonitrile content) resistance. NBR can also be used in conditions of dilute acids, alkalis and salt solution at low temperatures. Nitrile rubber is the most commonly used and economical elastomer for O-rings and other sealing devices.
Nitrile does not perform well in aromatic hydrocarbons, chlorinated hydrocarbons and polar solvents.