I'm Ready To Order Foam Products TRYMER® PIR A polyisocyanurate closed-cell foam insulation for industrial and studio use TRYMER® 25-50 PIR Offers the same, great thermal performance of TRYMER PIR but with a lower flame/smoke rating that meets the ASTM 84 Fire Hazard Classification Rating TRYMER® CORE PIR Designed to meet a wide range of end-user specifications