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Nitrile rubber (NBR, Buna-N) is a very common material for gaskets because of its good mechanical properties, its resistance to lubricants and greases, and its relatively low cost. Nitrile elastomers are copolymers of acrylonitrile and butadiene.

Nominal Pipe Size: 1/2
Pressure Rating (lbs): 150
Flange Standard (ASME): ASME B16.5
Thickness (In.): 1/8
Inner Diameter (In.): 0.840
Outer Diameter (In.): 3.500