polyurethane composite panel 1.Noise-absorbing 2.Hear-insulated 3.Beautiful decoration 4.Easy to install polyurethane composite panel Specification:1. External / Internal steel panel: Thickness: 0.4-0.8mm Basic steel: color-coated panel/zinc plate, hot galvanized plate and stainless steel panel Finish: Galvanized, color coated with PE or PVDF, stainless steel with brushed, mirrored2. Core ...