Polyurethane Trimerization Catalysts for Appliance Insulation Foam Formulations: A Comprehensive Review Abstract: This article provides a comprehensive review of polyurethane (PUR) trimerization catalysts employed in appliance insulation foam formulations. These catalysts play a crucial role in promoting the isocyanurate (PIR) reaction, leading to improved thermal stability, fire retardancy, and overall performance of the insulation material....