Manufacturing process of expandable polystyrene Expanded Polystyrene - EPS is obtained from processing expandable polystyrene. This raw material, expandable polystyrene, is a styrene polymer that contains an expanding agent: pentane. Expanded or expandable polystyrene does not use and has never used expanding gases from the family of CFCs, HCFCs and      HFCs and, therefore its manufacture and use does not lead to any type of effect on the depletion of the Ozone Layer. Like all plastic materials expandable polystyrene is derived from petroleum.     Further information about the manufacturing process. Further information about the material.   Quote request form. [home]