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Sand casting is a type of casting in which a metal or wood pattern is cast in an expandable mold made from sand packed around a replica of the object to be cast. After the sand is packed around it, the pattern is removed, and the molten metal is poured. After the metal has solidified and cooled, the sand is swept away, freeing the sand-like texture imparted by the mold. As the accuracy of the casting is limited by imperfections in the mold-making process, there may be extra material to be removed by grinding or machining, more than is required by other, more accurate casting process. Furthermore, because the mold is destroyed in order to retrieve the object, a new mold must be made for each casting. (The pattern is reusable). However, sand casting offers the advantage of allowing the casting of iron and steel, whose melting points are too high for a process such as die casting.
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