Edge Rock wool sandwich polyurethane rigid foam is the internationally recognized best building envelope fire insulation sheet. Its low thermal conductivity, Nijhuis resistance, high flexural strength, non-absorbent, non-perishable, non-moth-eaten rat bite, flame retardant, high temperature range. Physical characteristics utilizing a polyurethane (PU.PIR) and the unique formula buying rockwool sandwich panel, the polyurethane foam spray evenly coated on a painted steel wool sandwich panel manufacturers make between a blowing agent in painted steel become a three-time molding foaming polyurethane (PU.PIR) steel composite sandwich panels. This new lightweight building materials is the perfect combination of painted steel and polyurethane, is the development direction of light building materials. On the panel to be divided into two types: metal and nonmetal two panel panel. Metal panels easy processing, can be made into a variety of shapes, but some cases of non-metallic panels with metal panels that fall effects, such as corrosion resistance, impact resistance and other aspects.