Permatex Sensor-Safe High-Temp Rtv Silicone Gasket Maker Specially Formulated To Meet Specifications For Oxygen-Sensor Equipped Engines. Withstands Shock, High Pressure And Temperatures To 650�f (343�c) (Oil Pans, Valve Covers). Use Where Superior Temperature Resistance Is Required. Permatex, Made For The Professional. 650�f Intermittent. Pressure Resistant. Gasket Maker Or Dressing, Remains Flexible. Resistant To Temperatures And Most Fluids.