... collision and heat insulation2.Smooth Surface3.no toxic.durable in water ,could filter air,dustClosed cell foam could stand some ... closed cell .,10-60ppi ,good elasticiry ,no toxic.durable in water ,could filter air,dust.1 .pu foam material2, reticulated, ... .washable ,durable in water . 5 widely used in aquarium filter ,water filter ,air filter ,water pump,medical machine,cleaning kitch and dish ect ...