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...