Acrylonitrile Butadiene Rubber (NBR – Nitrile)
Also known as Acrylonitrile Butadiene Rubber / BUNA N / Nitrile is a copolymer of Acrylonitrile & Butadiene in which Acrylonitrile content varies from 18% to 50%.
- ASTM Classification : BF/ BG / BK
- Temperature Range : - 30°C to 100°C (General Compounds) - 50°C to 125°C(Specially formulated Compounds)
NBR (Nitrile) can be classified into 4 categories as below:
- High or Ultra High Nitrile : Acrylonitrile (ACN) content between 36% to 50%
- Medium High Nitrile : Acrylonitrile (ACN) content between 30% to 35%
- Medium Nitrile : Acrylonitrile (ACN) content between 25% to 29%
- Low Nitrile: Acrylonitrile (ACN) content 24% or lesser
Increasing ACN content Oil/Fuel & Heat Resistance improves considerably, however low temperature flexibility & resilience are compromised.
Medium High Nitrile (ACN Content 30 – 35%) offers good overall balance of all properties, hence is most widely used in the production of O’Rings, Seals & Other Moulded, Extruded Rubber Products.
Adnavtages
- Good Oil & Fuel Resistance
- Good Resistance to Hydraulic Oils & Fluids
- Good Resistance to Mineral & Vegetable Oils
- Good Resistance to Grease
- Good Resistance to Water
- Good Resistance to Alcohol
- Good Resistance to Aliphatic Hydrocarbons
Disadnavtages
- Poor Aging Resistance
- Poor resistance to Ozone, Weather & Sunlight
- Poor resistance to High Aromatic Content Fuels
- Poor Resistance to Glycol Base Brake Fluids
- Poor Resistance to Chlorinated Hydrocarbons
- Poor Resistance to Strong Acids
- Poor Resistance to Polar Solvents