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Green sand is made up of several key components. The primary ingredient is silica sand, which provides the mold with its structure. The sand is typically combined with a certain percentage of clay, usually sodium bentonite, which serves as a bonding agent, helping to hold the sand grains together. Water is added to this mixture, activating the clay and making it pliable. The proportions of these materials can vary depending on the specific requirements of the casting application, but a typical formulation consists of about 90% sand, 10% clay, and 2-5% water.