POLYFEPS (For Expanded Polystyrene {EPS} Boards) POLYFEPS is an Expanded Polystyrene (EPS) is made by QIF since 1985 and to among the raw material employed for cost-effective construction as well as efficient packing. These granules translate into a constant high quality of the product and processes. General information on Expanded Polystyrene (EPS) Expanded Polystyrene (EPS) products are used for a wide variety of construction applications, including such applications as thermal insulation and cavity wall insulation particularly suitable for applications exposed to compressive load.