Contractor Grade Furnace Cement 16 oz A thicker contractor grade furnace cement that is a premixed readytouse high temperature silicates Designed for patching or repairing cracked or chipped firebrick and mortar Effective in resetting and cementing furnaces stoves chimney collars boilers and duct work A multipurpose cement for bonding and sealing both masonry and metals with working temperatures up to 3000F Gray Features. Contractor Grade Furnace Cement 16 ozSpecifications. Dimension 051 x 051 x 051 in. Cube 013. Accessory Type Contractor Grade Furnace Cement. For Use With Boilers Chimney collars Corn stoves Cracked or chipped firebrick Cracked or chipped mortar Duct work Furnaces Masonry pellet stoves Wood. Weight 2 lbs