Perbunan®/Krynac®

Perbunan® is a fast-curing synthetic rubber that is used for the manufacture of oil-resistant rubber articles.

Perbunan® is a fast-curing nitrile-butadiene rubber that is used for the manufacture of oil resistant technical rubber articles with excellent cost/performance ratio. Vulcanizates are characterized by a high modulus and good sealing force retention when correctly formulated and processed. Perbunan® grades are available in the range of 18 % to 49 % acrylonitrile content (ACN).

Perbunan® is preferably used for molded rubber parts such as seals (including rubber-to-metal composites), membranes, vibration dampers and hoses. It is also used for rubberized fabrics (printing blankets, flexible containers), roll covers, sheets, conveyor and transmission belting, shoe soles, other footwear parts, thermoinsulation articles and other applications. If Perbunan® is mixed with PVC, the blends can be used as polymers for colored ozone resistant articles such as hose covers, cable sheathing and spinning aprons.

Business Unit : Technical Rubber Products

Properties and Benefits

Very good resistance to oils, greases and fuels
Very good low temperature flexibility
Good physical properties (modulus, compression set)

Synonyms

Acrylonitrile-Butadiene rubber
NBR
Nitrile rubber

Krynac® is the trade name of a series of oil-resistant acrylonitrile-butadiene rubbers (NBR) manufactured by emulsion polymerization. The product range consists of several grades of varying acrylonitrile content between 26% and 50% and varying Mooney viscosity of between 30 and 110. Some special grades, Krynac® X grades, are terpolymers of acrylonitrile, butadiene and an unsaturated carboxylic acid (XNBR) and are intended for applications that are subject to extreme stress and wear.

Krynac® NBR polymers are suitable for various applications in industrial equipment and machinery: Krynac® is used for hydraulic hoses, fuel and oil supply hoses, seals, rollers, drive belts, fabric linings and gaskets. Other applications are shoe soles (sport shoes and safety footwear) and flooring.

Most Krynac® grades meet the legal requirement for food grade articles intended for repeated use. Therefore food supply hoses, milking inflation tubes or conveyor belts for foodstuffs (fats and greases) are based on Krynac®.

Business Unit: Technical Rubber Products

Properties and Benefits