On the panel to be divided into two types: metal and nonmetal two panel panel. Metal panels easy processing, can be made into various shapes steel sandwich panel models, but on some occasions of non-metallic panel with metal panels that fall role steel sandwich panel, such as corrosion resistance, impact resistance and other aspects. 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 steel sandwich panel manufacturers, we can prevent moisture condensation. Forming an outer steel sandwich panels feature fully consider the structure and strength requirements, 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 (currently on the market, the most widely used varieties); namely XPS extruded polystyrene sandwich sandwich; rigid polyurethane sandwich panels That PU sandwich; Third polyester sandwich ie PIR sandwich panels; namely PF phenolic sandwich sandwich; namely RW sandwich rockwool sandwich.