It is termed as “closed cell foam” as these nitrogen cells are not connected like a sponge so that gases and liquids are not easily absorbed into the material. This property makes it waterproof, buoyant and can recover from repeated impacts.
It is light weight, odourless, non-toxic and being made of polyethylene it has exceptional chemical resistance to most oils, solvents, acids and alkalis.
Besides this, it is weatherproof, has a high level of ultraviolet stability, is durable, can be washed and disinfected and wiped clean relatively easily.
Its most important property is its ability to recover from repeated impacts being highly energy absorbent (which also makes it a good thermal insulator). In effect, each cell acts like a balloon, enabling the foam to bounce back to its original shape. As a result, it is the ideal foam inserts for cases and foam packaging in general.