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.
China Manufacturer Wholesale Price Steel Structure Frame Zinc Coated Steel Profile C Z Galvanized C Z Purlins for Roof Support High Quality Warehouse Style House Plans Steel Structure Truss Purlin Hot Rolled Black Galvanized Channel Steel C Z Purlin