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. The use of polyurethane (PU.PIR) physical characteristics and unique formula, the polyurethane foam spray evenly coated in painted steel, painted steel between the blowing agent in foam molding become three-time molding polyurethane ( PU.PIR) Caigang composite sandwich panels. This new lightweight building materials is the perfect combination of painted steel and polyurethane composite rock wool sandwich panels, lightweight building materials is the development direction. By automatic continuous sandwich composite molding machine, the outer layer is a high-strength material (eg, color galvanized steel, stainless steel plate), the inner layer is a lightweight insulation material (flame retardant polystyrene, mineral wool, polyurethane, etc.) through automatic molding machines, high-strength adhesive bond between the two, pressurized, trimming, slotting, blanking from sheet metal. Sandwich only has good insulation, thermal insulation and moisture and other physical properties, but also has good mechanical properties of shear, as a contemporary popular new building materials. Please use rock wool fire retardant plate (glass wool) color steel sandwich.