These SAE HNBR (Hydrogenated Nitrile Butadiene Rubber) are to be applied in situations where standard nitrile is not applicable such as when using aliphatic hydrocarbons, vegetable & animal fats & oils, HFA, HFB & HFC hydraulic fluids, dilute acids, bases & salt solutions at moderate temperatures, water & steam up to 149°C (300°F), ozone. Superior resistance to aging & weathering.