... layer: Color steel sheetMiddle: polystyrene foam board or polyurethane foam boardThicknessColor steel sheet: 0.3-0.6mm Polystyrene ... 200mmdensityRock wool 120-250kg/m3,EPS 12-35kg/m3,PU 35-50kg/m3Conventional colorOcean blue, tephrosiouslifetime15~20 yearsCharacterLight ... Composition: Core materials: EPS, XPS,Rok wool, Glass wool,PU, PUR Surface materials: PPGI, GI, Stainless steel sheet, galvalume ...