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Nitrile   (Acrylonitrilebutadiene) Another early development in the search for an oil resistant rubber. The most suitable rubber for applications requiring resistance to petroleum based fluids (there are rubbers with higher degrees of resistance but these are much more expensive). Properties • very good resistance to petroleum based fluids • good high temperature resistance - up to 100°C (120°C with EV cure systems) • economical to compound and produce • very low level of permeability to gases Limitations • poor resistance to outdoor weathering without special compounding • comparatively low strength • flammable and burns with toxic fumes Typical Applications • sealing in enclosed spaces where there is contact with petroleum based fluids • sealing against gases