Polyurethane(PU)sandwiched panel is composed of 2 layers of colored steel sheets and injected hard forms of polyurethane between 2 layers which feature fireproof materials.
50 mm Insulated Fireproof Rock wool Sandwich Panel Wall Panel for Workshop Building Warehouse/Cold Room Mineral 75 mm 100 mm 150 mm Wool Panel Fireproof Rock wool Sandwich Wall Panel