Heat Stop 50

One of our top-selling products, Heat Stop 50 is the masonry construction industry standard for high-temperature refractory mortar. This product meets and exceeds ASTM C-199 and all other national and state building codes. As such, Heat Stop 50 is non-water soluble and can be safely used in the installation and repair of heat-resistant firebrick and masonry in bake ovens, boilers, fireplaces, flues, furnaces, incinerators, kilns and woodstoves that reach temperatures of up to 2,500 degrees. Combine Heat Stop 50 dry mix with clean, cold water for masonry applications. The 50-lb. bag yields about 60 lbs. of refractory mortar after mixing. You will need approximately 50 lbs. of product to lay up 100 firebrick.

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