NBR Nitrile
NBR (Nitrile), chemically, is a copolymer of butadiene and acrylonitrile. The acrylonitrile content in commercial products ranges from 18% to 50%. As the NBR content increases, the resistance to petroleum base oils and hydrocarbon fuels increases, but the flexibility at low temperatures decreases.
About NBR
Due to its excellent resistance to petroleum products and ability to be compounded for use in a temperature range of -35°C to +120°C (-30°F to +250°F), nitrile/NBR is the most widely used elastomer in today's sealing industry.
Also, nitrile-based compounds are required for many military rubber specifications forfuel and oil-resistant O-rings. It should be noted that in order to obtain good resistance to low temperatures, it is often necessary to sacrifice some resistance at high temperatures.
Nitrile compounds are elevated above other elastomers when it comes to compressive hardening, tear resistance and abrasion resistance. Nitrile compounds do not have good resistance to ozone, sunlight or weathering. They should not be stored near electric motors or other ozone-generating equipment.
NBR Applications
NBR parts should be kept out of direct sunlight. However, this can be improved through compounding. NBR is the standard material for hydraulics and pneumatics.
NBR is resistant to oil-based hydraulic fluids, greases, animal and vegetable oils, flame retardant fluids (HFA, HFB, HFC), grease, water and air. Special low-temperature compounds are available for mineral oil-based liquids. By hydrogenation, carboxylic acid addition, or PVC mixing, the nitrile polymer can meet a more specified trajectory of physical or chemical requirements. The quality of nitrile compounds depends on the percentage of acrylonitrile in the base polymer.
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