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The air set sand casting process involves the preparation of a mixture of sand and a chemical binder. Unlike traditional green sand casting, which uses moisture in the mold, air set sand casting relies on a two-part chemical binder system that hardens when mixed with sand. This mixture is often placed into a mold box, where it is shaped around a pattern that represents the object to be cast. Once the mixture cures, the pattern is removed, creating a mold cavity.