Sand Casting Foundry Gamma Foundries is a non-ferrous sand castings company. It produces aluminum, copper and stainless alloy castings from one-off to thousands for a wide variety of industries. The foundry pours over 30 alloys including no-lead bronzes. It has both Hunter and Sinto automatic molding machines plus manual machines for lower volumes. Gamma Foundries also has a no-bake molding operation for larger casting up to 3000 lbs in bronze, 1200 lbs in aluminum, and 500 lbs in stainless steel.