Modified water glass and organic ester-hardened water glass can reduce the amount of water glass added to the mold and core sand to 2.2~3.0%, which significantly reduces the residual strength of the water glass sand. This not only improves the surface quality of castings, shortens the sand cleaning time of castings, but also makes it possible to recycle old water glass sand. Especially for steel castings, such as those used in railway vehicles, heavy industries, pumps, valves, and other industries, which are prone to hot cracking in the production of thin-walled, box-shaped, and other steel castings, it has received widespread attention and application.

Modified water glass can also be applied to the production process of casting molding sand cured by blowing carbon dioxide.