Steel sandwich panel is formed by two layers of metal panels (or other material panels) and directly in the middle of the panel foaming, curing the polymer composition forming the core insulation. The finished sandwich panels easy to install, lightweight and efficient. Filling system is closed-cell molecular structure of rock wool insulation panels, can prevent moisture condensation. Forming an outer steel sandwich panels feature full consideration of the structure and strength requirements wholesale rock wool insulation board, and taking into account the appearance, the inner surface layer is formed into a flat to suit all needs. Characteristics of sandwich panels of polystyrene sandwich namely EPS sandwich panels (rock wool insulation panels currently on the wholesale market, the most widely used varieties); namely XPS extruded polystyrene sandwich sandwich; Hard That PU sandwich panel polyurethane sandwich panels; three polyester sandwich ie PIR sandwich panels; namely PF phenolic sandwich sandwich; namely RW sandwich rockwool sandwich. Color-coated steel sandwich panels is a surface material, self-extinguishing polystyrene, polyurethane, glass wool, rock wool as core material with a hot curing adhesive in a continuous compounded by heat and pressure molding machine The lightweight building board. With light weight (weight of concrete roof 1/20 to 1/30), insulation (thermal conductivity value (0.034W / mk) rock wool insulation board manufacturers, the construction speed (no wet work, not re-decoration, construction period can be shortened by more than 40%), bright (no surface decoration, color galvanized steel coating retention characteristics in 15-30 years), which is a set of load-bearing, insulation, waterproofing, decoration in one New Structural Materials.