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1>PU foam ,good for aquarium filtering, 2>good air permeability, 3> Polyether foam which reticualted and open cell(10ppi-80ppi) - details see: https://www.machineto.com/pu-foam-10212725

PU foam widely used for aquarium filtering, water filtering, air filtering, packing and other business .

The polyurethane 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's durable in water and low cost .

PU foam which reticulated and open cell .