Ultra Copper Maximum Temperature RTV Silicone Gasket Maker. Highest operating temperatures for 4-cylinder, turbocharged or high-performance engines. The most advanced, high temp RTV silicone gasket available. Sensor-safe, low odor, non-corrosive. Superior adhesion. Three times more oil resistant than conventional silicones; eight times more flexible than cut gaskets. Temperature range -75?F to 700?F intermittent. Resists auto and shop fluids and vibration. Suggested Applications: exhaust manifolds/headers, valve covers, oil pans, timing covers, water pumps, thermostat housings.