the elevated floor is made of good cold-rolled steelsheets, which are punched, spot-welded, coated with epoxy powderafter has been phosphoreted.inside of the panel is filled withfoamed cement. the top steel sheet of the panel is stuck with highanti-wear and fireproof high-pressure laminate (hpl) of conductivepvctile. the borders of the panel are trimmed with conductive pvcedges.