Introduction Tris(dimethylaminomethyl)phenol, commonly known as PC41, serves as a highly effective trimerization catalyst in the production of polyisocyanurate (PIR) foams and other polyurethane (PU) applications. This tertiary amine catalyst promotes the isocyanurate trimerization reaction, a key step in creating rigid PU/PIR foams known for their superior thermal stability, fire resistance, and mechanical properties. This article...