Synergistic Catalysis in Polyurethane Production: Amine Catalysts and Metal Catalysts – A Technological Review Abstract: Polyurethane (PU) production hinges on the precise control of two crucial reactions: isocyanate-polyol reaction (gelation) and isocyanate-water reaction (blowing). Achieving a balanced interplay between these reactions is essential for optimal PU foam properties. Traditionally, amine catalysts have been the workhorse...