silica sand equipment makers in colombia
silica sand equipment makers in colombia. Sand casting Wikipedia. Types of base sands. For high melting point casting, such as steels, a minimum of 98% pure silica sand must be used; however for lower melting point metals, such as cast iron and nonferrous metals, a lower purity sand can be used (between 94 and 98% pure). Get Price. Crushed, Ground Powdered .