For making complex-shaped components, Investment casting like the aluminum investment casting china is generally used that require better surface finish, thinner walls and tighter tolerances than can be obtained with sand casting. With wax, a pattern of the part is made which into fine ceramic slurry is then dipped that contains colloidal alumina and silica. To melt out the wax, the mould is heated and dried inside an oven leaving behind a ceramic shell mould for casting. 

For precision casting of aerospace components such as gas turbine blades, the investment casting method is used also called the lost wax process. In lower strength than sand castings, the investment casting of aluminium alloys results but offers the capability, better surface finish and tighter tolerances to produce thin-walled sections.

Parts of similar geometric shapes and size can be produced by Investment casting, as well as die casting. Since, the disposable pattern is made by injecting wax into a mold as you will learn below featuring that are costly or difficult to die cast or injection mold are also costly to investment cast.

When low production volumes are expected, Investment casting is typically used whereas when high production volumes are expected, die casting tends to be used.