If you want a clear technical comparison between extruded vs expanded polystyrene, Universal Foam Products provide a Data Sheet for both so you can compare them easily. Simply give us a call us at 410-498-0000 if you need any further advice on the difference between these two insulating construction materials. For more information check out the extruded polystyrene (XPS) Data Sheet and the expanded polystyrene (EPS) Data Sheets for more information.