THE ENDLESS POSSIBILITIES OF RUBBER
Nitrile Butadiene Rubber, NBR
First introduced to the market by Bayer in 1930 under the name Buna-N.
|Resistance and properties:|
Based on 2 monomers, acrylonitrile and butadiene. The higher the acrylonitrile content, the more resistant the elastomer is to aliphatic hydrocarbons. The lower the ACN content, the better it resists low temperatures.
A subdivision can be made:
High ACN content, higher than 45%
Medium ACN content, between 30% and 45%
Low ACN content, lower than 30%
Gas permeability is low. Low compression set, heat ageing, ozone resistance and abrasion resistance can be improved by means of special compounding. Normally usable up to +100 deg C, and with special compounding up to around +120 deg C. This is an inexpensive rubber with high resistance to aliphatic hydrocarbons, oils and fuels. However, resistance to aromatic oils is poor.
Not ozone or weather resistant. Not resistant to aromatic oils, chlorinated hydrocarbons (trichloroethylene) or strong acids.
|Applications:||Frequently used for hydraulic and fuel seals.|