... Chinese Green Environmental Protection Product"Title. PU( polyurethane)sanwich panelFocus on researching and manufacturing of various polyurethane color steel panel, Widely used : ... steel can do as your order,the thickness of PU sandwich is 50mm,75mm.100mm.120mm,150mm,180mm,200mm. ... steel or aluminum foil board,filled with high-4. density polyurethane (The density can reach 42kg/m3) .5. standard width ...