The size of molded test piece is 100±2mm and 400±2mm in width and length. Test piece has six skin layers, and the thickness direction shall be the foaming direction.The test piece must be made by the same foaming conditions as mass production, and there must ont be a crack, mixing of garbage and a big dent in the test piece. Hereafter, it tests by using three kinds of molded test pieces of 250±10N,300±10N at ∮200 in hardness. The measuring method and molded test piece of hardness is referred to 3.3. Various test pieces cutting out procedures are shown from the molding test piece in the figure below.