Tin-Free Eco-Friendly Polyurethane Gel Catalyst Alternatives: Performance and Prospects Abstract: The polyurethane (PU) industry has traditionally relied heavily on organotin compounds, such as dibutyltin dilaurate (DBTDL), as gelation catalysts. However, due to increasing environmental and health concerns regarding tin-based catalysts, the search for and development of tin-free alternatives has become a paramount objective. This article...