In foundries, metal is melted and poured into molds that are a negative of the final molded part. Often, the molds are expendable and are destroyed after each part is cast. Examples of expendable mold castings are sand, plastic, shell, plaster, and investment (lost-wax technique) moldings. Batch and conveyor ovens are used for each of the above mold types. In sand casting, for example, the sand molds are coated with a release agent (core “wash”) on the interior, which is dried in an oven prior to molding. Ceramic molds are dried in an oven to remove absorbed moisture. Wisconsin Oven designs and manufactures batch and conveyor ovens specifically for casting processes. Metalcasting is used to manufacture engine blocks, automotive steering components, transmission housings, pistons, agricultural equipment, and many others. The most commonly processed metals are aluminum and cast iron, however, there is still a fair amount of bronze, brass, steel, magnesium, and zinc being produced in foundries.