1>PU foam,Polyurethane foam which reticualted and open cell(10ppi-80ppi) 2>strong compression strength;reduce noise PU foam has different mesh(8ppi-60ppi), high resilient ,good air permeability .PU foam, open cell , reticulated .Widely used for cooling tower, reduce noise , KTV room ,air filter and other business .It's durable in water and low cost .PU foam, open cell and reticulated . PU foam