After the dipping and coating step in the investment casting process, a structure now exists consisting of wax-filled shells or molds and the sprue that attaches them to a single entry point for molten metal. To remove the wax from the shells and clear the sprue, the molds are briefly placed in an 1,800º furnace. After cooling on a bed of sand, they are ready for pouring. Quality assurance is essential to avoid an array mold issues that can compromise the quality and accuracy of finished castings.