PU Sandwich panel is used in large industrial plants, warehouses, stadiums, supermarkets, hospitals, cold storage, mobile homes, building plus floors, clean workshops and places where insulation and fire protection are required. It is composed of 2 layers of weather-proof colored steel sheets and jetted the hard forms of polyurethane between 2 layers which feature fireproof materials. It is suitable for the various roofs and walls referring to the large-size factory. PIR Sandwich Panel also called Polyisocyanurate sandwich panel composed of 4 Parts. On the top and bottom, we choose the best quality steel, all of these steels through special processing.