Synergistic Polyurethane Trimerization Catalyst Blends for Optimized PIR Properties Abstract: Polyisocyanurate (PIR) foams, a subclass of polyurethane (PUR) foams, are widely employed in building insulation and other applications due to their superior thermal stability and fire resistance. The trimerization reaction, converting isocyanates into isocyanurate rings, is crucial for achieving these enhanced properties. This article examines...