Fireclay Refractory

the most common type of alumino-silicate refractory product. Fireclay refractories contain 28–45 percent Al₂O₃. They are made from refractory clays and kaolins cut by the addition of fireclay or, sometimes, nonplastic clay rocks and quartz. They are used in blast, reheating, and roasting furnaces; they are also used in pouring steel and in other operations.