A ready to use, premixed, air setting, high temperature refractory and retort cement for mortar facing, caulking or coating. Exclusive Clean n Friendly™ formulation of high purity ingredients provides a dependable cement containing no oils, no asbestos, no silicon dioxide. Smoother consistency provides for an easy application. Use to seal and repair boilers, furnaces, fireboxes, flue pipes, stoves, ducts, kilns, chimneys, combustion chambers, and many other furnace and refractory applications. Patented formula meets or exceeds OSHA requirement for minimal silica content. Furnace cement can be used on oil, gas, coal, and wood burning heating systems. Adheres to most building materials and when cured makes positive non-porous, fireproof, acid proof seals that will not shrink, crack or crumble. Freeze point below +10 deg F for uncured material.