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Permatex 81878 ULTRA COPPER RTV Gasket Maker, 3 oz. Permatex Ultra Copper is a high temperature RTV gasket maker, resisting temperatures up to 700°F (371°C). Ultra Copper is tested to exceed OEM specifications and is ideal for high temperature applications such as turbocharger applications and exhaust systems Features: High-Temp Gasket Maker For high operating temperatures, turbocharger applications and exhaust systems Sensor-safe, low odor, non-corrosive Temperature range -65°F to 700°F (-54°C to 371°C) intermittent Resists auto and shop fluids and vibration.