Nitrile rubber, also known as Buna-N, Perbunan, or NBR, is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene.
Nitrile butadiene rubber is a family of unsaturated copolymers of 2-propenenitrile and various butadiene monomers (1,2-butadiene and 1,3-butadiene). Although its physical and chemical properties vary depending on the polymer’s composition of nitrile, this form of synthetic rubber is generally resistant to oil, fuel, and other chemicals (the more nitrile within the polymer, the higher the resistance to oils but the lower the flexibility of the material).
It is used in the automotive and aeronautical industry to make fuel- and oil-handling hoses, seals, and grommets, as well as in the nuclear industry to make protective gloves. NBR’s ability to withstand a range of temperatures from -40 °C to +108 °C / -40 °F to 226 °F makes it ideal for aeronautical applications. Nitrile butadiene is also used to create molded goods, footwear, adhesives, sealants, sponges, expanded foams, floor mats and other covering layers. Its resilience makes NBR a useful material for disposable lab, cleaning, and examination gloves.
Nitrile rubber is more resistant than natural rubber to oils and acids, but has inferior strength and flexibility. Nitrile gloves are nonetheless three times more puncture-resistant than natural rubber gloves.