Basic knowledge of expandable polystyrene (EPS) Expandable polystyrene (EPS) is produced in a suspension process by adding a blowing agent, usually pentane, which causes resin to foam during moulding. The process may be performed as a single step or a two step process. The two step process passes the blowing agent though the polystyrene beads … Continue reading Pentane is the most common expansion agent in EPS production