EPS vs PUR

Two insulating cores are available for your Cas-Lin SIP panel. Expanded Polystyrene (EPS) or Polyurethane (PUR).

Energy Efficiency: Polyurethane foam is a better insulator and offers the best physical properties of any insulating foam. Polyurethane foam has a stable R-value of R-7 per inch of thickness, versus R-4 for EPS. This means you can achieve a higher R-value with a thinner panel.