NBR / BUNA-N

BUNA-N (or NBR) is a copolymer of acrylonitrile and butadiene available in various ratios of these monomers.

Better known as Nitriles, reinforced NBR rubbers have good oil and gasoline resistance, tensile strength, elongation properties, heat resistance and low compression set. Special compounding is required for good weatherability.

Typical application for these medium priced rubbers are seals, O-rings, gaskets, diaphragms, pipe gaskets, tank linings, boots and bellows. A carboxylated version of high-acrylonitrile butadiene copolymer (XNBR) is available for application requiring the ultimate in wear resistance. In the reinforced state, this medium-priced rubber also offers high tensile strength and elongation, as well as, high load bearing capability. These properties are obtained without any sacrifice in the other properties of conventional, high-acrylonitrile copolymers.

A hydrogentated version of acrylonitrile-butadiene (HNBR) is also available with a saturated polyer chain approaching 100%. This saturation and the reduction of weak carbon to carbon doublebonds achieved through hydrogentation improves the resulting polymers resistance to heat, chemicals, weathering and ozone. Also known as Highly Saturated Nitrile (HSN) this elastomer possesses excellent physical properties and resistance to crude oil, oxidized fuel and refrigerants. Formulations are available with a service temperature range of -40 to +300F.

 

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