closed cell foam 1.Anti-collision and heat insulation 2. ... durable in water ,could filter air,dust Closed cell foam 1.Anti-collision and heat insulation2.Smooth Surface3.no ... toxic.durable in water ,could filter air,dustClosed cell foam could stand some press ,closed cell .,10-60ppi , ... durable in water ,could filter air,dust.1 .pu foam material2, reticulated, mesh,10ppi-60ppi,3 good resilient, good ...