Quite simply, the type of cells (open up or shut) either allow or prevent the passage of liquids or gases. But isn’t the nitrogen that’s Employed in closed-cell sponge rubber a form of gas? And aren’t gases Utilized in foam rubber? It’s time and energy to take a further dive. https://jasperrgtiw.popup-blog.com/32765804/a-secret-weapon-for-rubber-foam-versus-sponge-rubber