Feature●Non-combustible silicate cement used for patching chipped firebrick in fireplaces and sealing●A non-combustible silicate cement for applications in wood-frame construction where an ASTM E136 sealant is required.●Adheres firmly to the firebrick when wet or dry. Sets rock hard when fired●Use to tuck point between firebricks and to repair broken firebricks●Pack of 2, Packaging may vary.Description DAP High Heat Mortar Black Silicate High Heat Heat-Resistant Caulk 10.1 oz.