Permatex rigid high torque Ultra Grey RTV silicone vacuum equipment gasket maker is designed specially for high-torque and high vibration applications, like those common in vacuum pumps. This premium RTV gasket maker exceeds manufacturers' performance requirements and is noncorrosive with low-odor. Maximum vibration resistance, with outstanding resistance to oils, cooling, and shop fluids. Guaranteed not to leak. Temperature range -65ºF to 500ºF (-54°C to 260°C) intermittent. These Permatex rigid high torque RTV silicone vacuum equipment gasket maker are packaged in a 3.5 oz tubes and are for use with vacuum O-rings and joints. Permatex gasket sealant is good to 1x10-3 Torr.