1. Surface layer: Protection film 2. Pvdf resin cold coating or polyester 3. Primary coating 4. Aluminum oxid pretreated film 5. High quality aluminum plate(standard thickness 0.2 or 0.5mm) 6. Anticorrosive coating 7. Adhesive film 8. Pe core plate fireproof(gb 8624-97) b 1 level 9. Adhesive film 10. Anticorrosive coating 11. Bottom alu. Plate(thickness 0.5mm Or 0.2mm) 12. Aluminum oxid pretreated film