Meeco's Red Devil Refractory Furnace Cement A pre-mixed, fiber-reinforced, high temperature silicate mortar for setting, coating or repairing firebrick. Used extensively as the mortar between firebricks when building fireplace fireboxes. The ideal high-heat sealant for masonry-to-masonry joints less than 1/4 In. thick. Effective in resetting and cementing furnaces, stoves, chimney collars, boilers, and duct work. Not intended for exterior use. Container Size 1 Gal., Color Buff, Temperature Range 3000 F, Pkg Qty 1, Package Type Tub WARNING This product can expose you to chemicals including crystalline silica which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.