Steel  raised access flooring/access panel/ with HPL lamination system are epoxy coated welded construction with an enclosed bottom pan formed with a uniform pattern of modular pockets. The unitized raised floor system/access floor/access floor system panels are filled with a lightweight cementitious material of sound deadening qualities and to provide the performance values specified. They are rigid structural assembles fabricated to exacting tolerances on squareness and flatness measured on a diagonal across the top of the panel.