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Green sand, clay sand, water glass, coated sand, resin sand
They are all sand casting in casting, but they are the difference between different binders.
Green sand, clay sand, and green sand are the same. The binder is all ordinary clay or bentonite. Since water is added during the sand mixing process, it is called green sand.
The binder of water glass sand is sodium water glass, which is generally hardened by blowing carbon dioxide or hardening by adding a hardener.
The binder of coated sand is generally phenolic resin, which is slightly toxic, and is generally used for sand cores.
The binder of the resin sand is furan resin, and the resin sand molding has a relatively large amount of gas after pouring. At present, the quality of castings molded with resin sand is the best in sand casting.

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