Several typical styling resins were introduced,pointing out that the proportion of different resins and better film forming, good styling, well solubility, safety and environment friendly resins were the directions of the developments.

In order to evaluate the effect of aluminum-type vesin on reducing the pollution of anion-exchange resin, EDTA distribution on resin was examined when aluminum-type resin and its mixed bed contacting EDTA.

The rational technics schemes of the out frame are designed by adopting resinous sand mold, easily disheveled resinous sand core, the same core supported material with casting, the opened composite of gap and center pouring system and suitable layout of chill and feather.