This castable refractory cement is ideal for casting into custom shapes to replace worn-out firebrick. Originally developed for use in blast furnaces, it has exceptional strength and is abrasion resistant. It can be cast into irregular shapes, used to fill large holes or cracks in masonry fireboxes or as a solid stone bed. When this dry material is mixed with water, it chemically sets and dries rock hard. It may be used in outdoor fire pits and appears light brown when cured.