A black, ready-mixed, high temperature silicate cement. Used for resetting furnaces, stokers, oil burners. Seal air and gas leaks, imperfections and breaks in all types of stoves, ranges and furnaces. Can also be used for sealing flue, coal or ash pit doors and for resealing gaskets in stove doors. This material has the appearance and texture of fine mortar, and will withstand temperatures to 2000°F. When air dried and cured according to directions, this cement becomes as hard and durable as firebrick.