Shell molding casting process is also called pre-coated resin sand casting process, hot shell molding castings or core casting process. The main molding material is the pre-coated phenolic resin sand, which is more expensive than green sand and furan resin sand. When the pre-coated sand is heated by the hot patterns, the sand will become strong shell to form the mold cavity, which will withstand the molten metal and alloys.

The pre-coated sand can not be recycle used. The shell molding castings have higher costs than sand casting. However, the shell molding casting parts have many advantages such as tighter dimensional tolerance, good surface quality and less casting defects.