Gravity Die Casting is a permanent mould casting process, where the molten metal is poured from a vessel or ladle into the mould. The cavity fills with no force other than gravity, filling can be controlled by tilting the die. As with the low pressure process, undercuts can be incorporated into the component form with the use if separate sand cores. This process gives a better surface finish than sand casting as well as better mechanical properties, both due to rapid solidification.