Exterior Rigid PUR Sandwich Panel The sandwich panel consists of 3 layers. Al-Zn steel sheet is embossed and used as the face sheet. Rigid polyurethane is used in the middle layer. So it performs well in heat insulation and coldness prevention. Size: 3800*380*16mm ( The length can be customized) Container loading quantity :1300 m2 for 1*20GP 3300 mr for 1*40HC