NBR stands for Nitrile Butadiene Rubber or Acrylonitrile Butadiene Rubber or Buna-N or Perbunan.
NBR is a synthetic rubber which belongs to the family of unsaturated copolymers of 2-propenenitrile and various butadiene monomers (1,2-butadiene and 1,3-butadiene)
NBR is produced in an emulsion polymerization system.
Water serves as the reaction medium within the vessels.
The tanks are heated to 30–40 °C to facilitate the polymerization reaction and to promote branch formation in the polymer
The emulsion process yields a polymer latex that is coagulated using various materials (e.g. calcium chloride, aluminum sulfate) to form crumb rubber that is dried and compressed into bales.
NBR requires formulating with added ingredients such as typically reinforcement fillers, plasticizers, protectants, and vulcanization packages.
Processing includes mixing, pre-forming to required shape, application to substrates, extrusion, and vulcanization to make the finished rubber article.
Mixing and processing NBR are typically performed on open mills, internal mixers, extruders, and calenders.
By selecting an elastomer with the appropriate Acrylonitrile (ACN) and butadiene (BD) ratios in balance with other properties, the rubber compounder can use NBR in a wide variety of application areas requiring oil, fuel, and chemical resistance.
In the automotive area, NBR is used in fuel and oil handling hose, seals and grommets, and water handling applications.
With a temperature range of –40C to +125C, NBR materials can withstand all but the most severe automotive applications.
On the industrial side NBR finds uses in non-latex gloves, synthetic leather, cable jacketing, roll covers, hydraulic hoses, conveyor belting, graphic arts, oil field packers, O rings, gaskets and seals for all kinds of plumbing and appliance applications.