①The strength of chemically hardened sand mold is much higher than that of clay sand mold, and after the sand mold is made, it will be released after hardening to have a relatively high strength, and it does not need to be repaired. ②Because the viscosity of the binder and hardener used is not high, it is easy to mix with the sand grains. The sand mixing equipment has a light structure, low power and high productivity, and the sand processing part can be simplified. ③The mixed molding sand has good fluidity before hardening, and the molding sand is easy to pound during molding, so there is no need for a large and complicated molding machine. ④When modeling with chemically hardened sand, the pattern material can be selected according to the production requirements, such as wood, plastic and metal. ⑤The content of binder in chemically hardened sand is much lower than that in clay sand, and there are no powdered auxiliary materials. If raw sand with the same particle size is used, the gap between sand grains is much larger than that in clay sand. ⑥The chemical hardening sand with water glass as the binder has low cost and no smell in the working environment. ⑦The cost of chemically hardened sand using resin as a binder is relatively high, but after pouring, the casting is easy to separate from the sand, the workload of cleaning the casting is reduced, and most of the used sand can be recycled and reused.