Sandwich panel is a newest thermal insulation buildingmaterial,it can be divided into two types, one is plasticboard with steel plate on both sides, the other is all madeby plastic boards; for the first one, it can be: steelplate+EPS/XPS/Rock Wool board/PU+steel plate, it isnormallly used in prefabricated house; the second can be:PVC+XPS+PVC, PS+XPS+PS,PU+XPS+PU etc, it is usuallyhousehold used; and all the sandwich panel is good atthermal insulation.