Two Aluminum Sheet (top & bottom) bonded with fire retardant granules coated with PVDF. 3003 Alloy H16 Temper-thickness 0.50mm for the top and bottom layers. Halogen free fire-retardant core 70% to 80%. Bottom layer Aluminum alloy coated with PE Polyester Coating. Top Layer Aluminum alloy coated with PVDF. Unit: Per Sqm