Permanent Mold (also called Permold) Ohio Aluminum foundry uses permanent mold casting and semi-permanent mold casting processes to achieve high strength requirements and to cast complex cored geometries. Alloys poured in our permold department include 319, 356, A356, 355, C355, 357 and A357. Parts include, air ducts, blender bases, brackets, chaincase covers, cylinder heads, differential housings, fuel control housings, head covers, intake manifolds, knuckles, oil adapters, oil pans, oil pump housings, water pumps, etc. Why Use Permanent Mold Process? Why Ohio Aluminum?