1>PU foam good for filtering,adsorb sound 2>good air permeability 3>reticulated, open cell 4) PU foam, toys . PU foam products widely used in aquarim filtering, water filtering, air filtering, packing and other filter business .PU foam has different mesh(8ppi-60ppi), high resilient ,good colors and good air permeability .Widely used for aquarium filter, water pump and other filtering business .It ...