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The basic raw materials for making sand molds are foundry sand and sand binder< r.< The most commonly used foundry sand is siliceous sand< r.< When the high temperature performance of silica sand cannot meet the requirements, zircon sand is used< < Chromite Sand < < Special sand such as corundum sand < r

. The basic raw materials for making sand molds are foundry sand and molding sand binder. The most commonly used foundry sand is siliceous sand. When the high temperature performance of silica sand cannot meet the usage requirements, zircon sand, chromite sand, corundum sand and other special sands are used. In order to ensure that the finished sand molds and cores have a certain strength and will not be deformed or damaged when handling, molding, and pouring liquid metal, a molding sand binder is generally added to the casting to bind the loose sand grains into molding sand. The most widely used molding sand binder is clay. Various drying oils or semi-drying oils, water-soluble silicates or phosphates and various synthetic resins can also be used as molding sand binders. The outer sand molds used in sand casting are divided into clay green sand molds, clay dry sand molds and chemical hardened sand molds according to the binder used in the molding sand and the way to build strength.