A subsidiary of Walter Energy, Walter Coke (formerly Sloss Industries) makes foundry coke, furnace coke, and slag fiber, and specialty chemicals. Foundry coke is sold to ductile iron pipe plants and to foundries that produce castings, such as for the automotive and agricultural equipment industries. Furnace coke is sold mainly to steelmakers. Walter Coke sells more than 400,000 tons of coke annually. The slag fiber made by Walter Coke  is used by makers of acoustical ceiling tile and as insulation in asphalt products. The company's specialty chemical products include nutraceutical components, pharmaceutical raw materials, plastics additives, and rubber additives.