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The primary function of casting sand suppliers is to deliver a product that meets the specific needs of the foundry industry. Suppliers must understand the nuances of different sand types and their applications. For example, fine grained sands provide excellent surface finishes, while coarse grained sands might be preferable for large, thick-walled castings. Furthermore, their knowledge of sand treatment techniques, including reclamation processes, enables them to offer tailored solutions to their customers.