CRC Red RTV Gasket 340 is formulated for heavy duty, high temperature applications with an intermittent service temperature of up to 340°C. CRC Red RTV Gasket 340 is a self-forming room temperature vulcanising Silicone that replaces almost any cut gasket, felt, cork, paper, asbestos and rubber gaskets. No gasket sealers are required - the pure silicone rubber forms to any size and shape quickly. CRC Red RTV Gasket 340 resists migrating caused by thermal cycles, cracking, shrinking and vibration. It is ideal for high temperature, high pressure applications, it will remain flexible and durable. CRC Red RTV Gasket 340 is NOT recommended for use on copper and brass. Do not use as a head gasket, not suitable for stove pipes or in fireplaces.