... water ,could filter air,dust Closed cell foam 1.Anti-collision and heat insulation2.Smooth Surface3 ... durable in water ,could filter air,dustClosed cell foam could stand some press ,closed cell .,10- ... water ,could filter air,dust.1 .pu foam material2, reticulated, mesh,10ppi-60ppi,3 good ... filter ,water filter ,air filter ,water pump,medical machine,cleaning kitch and dish ect. 6 UV- protection, ...