NITRILE Rubber (NBR, Buna-N, Nitrile)
Nitrile is the most widely used elastomer in the seal industry. The popularity of nitrile is due to its excellent resistance to petroleum products. It has good physical properties and is superior to most rubbers in regards to compression set, tear and abrasion resistance. It offers high resistance to mineral oil based hydraulic fluids, silicone greases, petroleum-based oils, water and alcohols.
The major limiting properties of nitrile are its poor ozone and weather resistance and moderate heat resistance, but in many applications, these are not limiting factors.
Temperature Range (dry heat)
Standard Compound: -40°C to +100°C
Primary Uses
Pneumatic seals, O-Rings, Oil seal lips, Gaskets, Washer and low pressure hydraulic seals. It can be used with a back-up ring in higher pressure applications. This is the most popular O Ring material and custom molded rubber components for:
» Oil resistant applications
» Low temperature applications
» Fuel systems, automotive, marine, and aircraft
» General Industrial Use
Application Advantages
» Excellent compression set
» Good tear resistance
» Good abrasion resistance
» Good petroleum-based oils resistance
» Good mineral oil based hydraulic fluids resistance
» Good solvent, water and alcohols resistance
Application Disadvantages
» Poor weather resistance
» Moderate heat resistance
» Not suited for using in brake fluids
» Not suited for using in highly polar solvents
