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sound absorption,(1) from a combination of multi-layer barrier layer of polymer open-cell structure of rubber and plastic, with very good noise reduction effect and the role of reeds and rushes with insulation. (2) The substrate selection of the pore openings larger rubber plate is right in the high-frequency sound absorption evident result. (3) The choice of substrate pore openings smaller rubber and plastic plate-frequency sound waves are right at the end of the absorption effect is good. (4) from the outer layer, PET's wear, tear, and aluminum (aluminum foil) in blocking ultraviolet rays, it has a high weather resistance. (5) The platinum surface structure may have aluminum or PVC polymer membrane composed of openings. Table Material: Size (thickness) Composite Polyester Film: 2.5 wire, 5 wire, etc. Composite aluminum foil: 5 wire, 6 wire, 8 wire, 9 wire, 12 wire Material: Thickness (mm): 4/10/15/20, etc. Width (mm): 1050/1000/1150, etc. Length (m): 10 (can be bonded into a sheet) Foam rate: 20 times / 30 times / 40 times of the