Key features include the use of coarse sand, activated bentonite, and the addition of wood shavings. The properties and composition of the dried sand meet both the requirements of wet sand and dry sand. No special drying equipment is needed for the dried sand molds, which have a shorter production cycle and are easier to clean. However, they are more stringent in terms of sand mold properties and process operations. Dried sand molds are mainly used for casting medium-sized castings, with the sand produced by foundry sand manufacturers weighing up to several dozen tons.