Green sand
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Green sands are mixtures of different types of wet sands with clay. This conglomerate called base sands has refractory granules in nature that resist high temperatures without melting with the spilled metal. And a binder, the clay, which has as its characteristic the cohesion and plasticity. There are 3 types of natural, semi-synthetic (with modified properties and additions) and synthetic smelting sands (obtained by mixing basic constituents, sand, binders, additives and plasticizers). The molding sands can be used repeatedly because they do not combine with the molten metal. In addition, they have a high degree of permeability, allowing the escape of gases formed during the spill.
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