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Investment casting is an industrial process based on lost-wax casting, one of the oldest known metal-forming techniques. Investment casting has been used in various forms for the last 5,000 years. For every investment casting to be produced, a wax pattern must be created. These patterns then are assembled in clusters around a coated sprue to create the casting tree, which is repeatedly dipped into an agitated vat of ceramic, and allowed to dry. After a shell thickness of approximately 0.375 in. (9.525 mm) has been formed, the molds are dewaxed by either flash firing at high heat [1,400F (760C)] or autoclaving (pressure and steam), and the wax is drained and recycled back into the process. The hollow ceramic shells then are preheated to 800-2,000F (427-1,093C) depending on the alloy to be poured, and the molten metal is cast immediately into the hot shell. The casting process either is performed by gravity-pour or vacuum methods (gravity or counter-gravity)

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