... steel, galvalume steel and stainless steelFinish: Galvanized, Powder-coated with PE/HDP/PUDF, Stainless steel with brushed/mirrored. 2. Insulation ... , environment protection, economical, good structure, easy to installation. Sandwich panel looks like sandwich. Two external surfaces are made of powder-coated steel ... , pharmaceutical, bio-tech and food processing etc. Paper Honeycomb Sandwich Panel