Black Swan 06020 8 OZ 1/2 Pint Refractory Furnace & Retort Cement is a ready to use, asbestos free cement used for setting and repairing furnaces, heaters, stoves, boilers, fireplaces, and for many other furnace and refractory applications. Adheres to stone, brick, wood, metal and most common building materials. Withstands temperatures up to 3000°F. Furnace & Retort Cement is fireproof, acidproof, gas-tight and smokeless.