cleanroom sandwich panel is a kind of elegant,even and rigid building panel.It take two layers of quality color coated sheets or other precisely profiled metal sheets as the surface material ,and after sheets rolled,fire-retarding polyurethane foam is injected into the two layers and compounded with metal sheets through specific technological conditions as high-pressure foaming and solidification.The panel is featured with fire resistance,heat preservation,water resistance and sound insulation,bringing a high quality apprerance to buildings.It is the most prosperous building panel of energy saving,heat preservation environmental protection and good appearance in the world.