... foam1.Anti-collision and heat insulation2.Smooth Surface3.no toxic.durable in water ,could filter air,dustExtruded polythylene foam could stand some ... toxic.durable in water ,could filter air,dust.1 .pu foam material2, reticulated, mesh,10ppi-60ppi,3 good resilient, good ... ,water filter ,air filter ,water pump,medical machine,cleaning kitch and dish ect. 6 UV- protection, environment , have passed SGS ...