Castable Refractory Mortar
Originally developed for use in blast furnaces, it has exceptional strength and abrasion resistance. It is ideal for casting into custom shapes to replace worn-out firebrick. Withstands up to 2200º F. When the dry material is mixed with water, it chemically sets and dries brick hard. It can be cast into irregular shapes, used to fill large holes or cracks in masonry firebox, or as a solid stone bed. May be used in outdoor fire pits. 25 lbs. casts a block 12" x 12" x 1 1/2". Light brown when cured.