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It has good low temperature flexibility and is superior to most elastomers in compression set, cold flow and abrasion resistance. However, it does not possess good resistance to ozone, sunlight or weather. Buna-N has a temperature range of -40 to+135 C (-40 to 275 F).
Nitrile rubber, also known as Buna-N, Perbunan, acrylonitrile butadiene rubber, and NBR, is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene.Trade names include Nipol, Krynac and Europrene.Nitrile butadiene rubber (NBR) is a family of unsaturated copolymers of 2-propenenitrile and various butadiene monomers (1,2-butadiene and 1,3-butadiene).he process for the production of cold NBR is very similar to that of hot NBR. Polymerization tanks are heated to 5â15 Â°C instead of 30â40 Â°C. Under lower temperature conditions, less branching will form on polymers (the amount of branching distinguishes cold NBR from hot NBR).