Expanded Polystyrene is a light weight polymer that delivers excellent chemical barrier defense and moistures resistance. The packaging application accounts for the highest share in the global expanded polystyrene (EPS) market. Expanded Polystyrene is a light weight polymer that delivers excellent chemical barrier defense and moistures resistance. The packaging application accounts for the highest share in the global expanded polystyrene (EPS) market. Expanded Polystyrene is a light weight polymer that delivers excellent chemical barrier defense and moistures resistance. The packaging application accounts for the highest share in the global expanded polystyrene (EPS) market.