How To Improve The Surface Finish Of Foam Castings Using Back Pressure
Improving the Surface Finish of Foam Castings Using Back Pressure. How Does It Work? After pouring a liquid expanding foam into a mold, a board that has been pre-drilled with holes is placed over the mold cavity and held securely until the foam rises and cures. This compresses the foam and results in a tighter cell structure against the mold surface.