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In the realm of metal casting, sand plays a vital and often underappreciated role. The use of sand in casting processes is a time-honored tradition that dates back thousands of years, dating from ancient civilizations that recognized its unique properties for creating molds. Today, the process has evolved, but the fundamental importance of sand remains unchanged. This article explores the types of sand used in casting, its characteristics, and the reasons why it continues to be a primary material in foundries around the world.