The outer layer is coated with silver noncombustible embossed aluminum foil (with air-hole), heat insulation for the hard-orange retardant B1-extruded polystyrene foam level.

• 外层为带涂层的银色不燃压花铝箔(带透气孔)，保温绝热层为橙色硬质难燃B1级挤塑式聚苯乙烯泡沫。