... pond,gutter filter,oil filter and so on.open cell,10ppi-90ppi Our foam has passed the SGS,ROHS,UL,CA117,BS5852 ... Reticulated and open cell4)excellent air and water permeabilityFilter foamFilter foam is widely used for aquarium filter, air filter and ... other filtering business.Pu foam,Polyester foam,polyether foam, top of quality,reasonable price and great creditstanding. ...