Expandable Polystyrene(EPS) EPS(Expandable Polystyrene) is a lightweight, rigid, plastic foam insulation material produced from solid particles of polystyrene. Expandsion is achieved by virtue of small amounts of pentane gas dissolved into the polystyrene base material during production.The gas expands under the action of heat, applied as steam, to form perfectly clesed cells of EPS. Application Expanded polystyrene with relatively low density (1.05 g/cm3), low thermal conductivity, low water absorption, impact resistance,heat insulation, sound insulation, moistureproof, vibration damping and excellent dielectric properties, widely used in mechanical equipment, instruments and meters, household electric, crafts and other valuable products easily damaged, shockproof packaging materials as well as the fast food packaging