... decorating.it have been rewarded CE and ISO9001:2000 certificate.2).Structure of pu sandwich panel:It consists of three layers: ... last layer is aluminum foil.3).Superior performance of pu sandwich panel:Heat preserving, heat/thermal insulation, water proof, impact ... , variety appearance,environmental friendly. Etc.4).Patterns of pu sandwich panel. fine brick-texture, coarse brick texture, stone texture, ...