The other less common but still important alloys could be cast by investment casting include grey cast iron, ductile cast iron, brass, bronze, aluminium alloy, nicke-based alloy and cobalt-based alloy. The custom investment castings of these metal alloys play an inavitable role for the industries due to their unique performances such as cost effective and shock absorption (e.g. grey iron and ductile iron) or high strength and corrosion (e.g. nickel or cobalt based alloys).