Nitrile butadiene rubber (NBR) is a family of unsaturated copolymers of 2-propenenitrile and various butadienemonomers (1,2-butadiene and 1,3-butadiene).
The properties vary depending on the ACN content which ranges between 18% and 50%.
The more nitrile within the polymer, the higher the resistance to oils but the lower the flexibility of the material.
This form of synthetic rubber is generally resistant to oil, fuel, aliphatic hydrocarbons, and other chemicals.
Nitrile, like natural rubber, can be attacked by ozone, aromatic hydrocarbons, ketones, esters and aldehydes.
Nitrile rubber however is more resistance than natural rubber to oils and acids, but has inferior strength and flexibility.
It is used in the automotive and aeronautical industry to make fuel and oil handling hoses, seals, and grommets. It is also used to create moulded goods, adhesives and sealants.