... PU sandwich panel. So it is the ideal insulated material for freezer.3.Good chemical resistance,waterproof,anti-corrosion, ... of manufacture time-effective and cost-effective.5.Easy installationPU properties:Density:(kg/m³) over 40Thermal conductivity rate (w/mk):less ... than 0.118Special door manufacturing process ,inner insulation layer material is made of molding PVC,thickness of 100mm,rubber sealing ...