Light-Stable Polyurethane Systems Based on Low Free TDI Trimer: A Comprehensive Overview Abstract: Polyurethane (PU) materials are widely used in various applications due to their excellent mechanical properties, versatility, and cost-effectiveness. However, traditional PUs are susceptible to degradation when exposed to ultraviolet (UV) radiation, leading to discoloration, embrittlement, and ultimately, failure. This article focuses on...