Buna, also known as Nitrile rubbernitrile butadiene rubberNBR, and Buna-N, is a synthetic rubber derived from acrylonitrile (ACN) and butadiene. NBR is known for being resistant to oil, fuel, and other chemicals and is therefore a great option for gaskets, seals, and hoses in these type of applications. It also features excellent temperature resistance, maintaining integrity from -40°F to 225°F