PIR (POLYISOCYANURATE)Â sandwich panels are preferred becauseÂ
Polyisocyanurate (PIR) foam is chemically and thermally more stable: breakdown of isocyanurate bonds is reported to start above 200°C, compared with urethane at 100 to 110°C.Â
Fire Resistance of this material is better than B-3 types PU.Â