introduction polyurethane (pu) elastomers are a versatile class of polymers renowned for their exceptional mechanical properties, chemical resistance, and broad range of applications. casting polyurethane elastomers involves reacting a polyol (a polyalcohol containing multiple hydroxyl groups) with an isocyanate in the presence of a catalyst. traditionally, organotin compounds, particularly dibutyltin dilaurate (dbtdl), have been the...