High density (700 Kg/m3) chipboard core recycled and ecological, FSC certified mixed with thermosetting resin. Bottom surface made by galvanized steel sheet 0,5 mm tck that provide a barrier for the humidity, increase mechanical resistance and as equipotential reinforcement to maintain the floor’s electrical continuity properties. Perimetral edge with plastic material no creaking with thickness from 0.45 to 0.70 mm.