... waterproof, thermal protection and insulation, structure maintenance adopt EPS (Expanded polystyrene) panel, rock wool, or other insulation color steel sandwich panels ... EPS sandwich panel, 0.42mm color steel sheet ,density of polystyrene foam (EPS sandwich panel) is 12kg/m3, Heat Insulated ... 0.35mm -0.42mm color steel sheet, density of polystyrene foam is 12kg/m3 . Heat Insulated coefficient is 0. ...