Since the invention sandwich in the world, developed countries are widely used in various industrial and civil buildings, the fire rock wool board, is an excellent building materials, composite fireproof rock wool board, such as the roof of the building, walls, ceiling, etc., in fact, sandwich panels have already left behind the era of brick, with a light weight, high strength, thermal insulation, easy construction, fire rock wool board construction, the surface does not have to be decorated on It has reached a high-grade appearance. Today, the sandwich panels used in the building is on the rise year by year. 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 that 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.