Improving Thermal Stability and Dimensional Accuracy in Rigid Polyurethane Foams by Incorporating Bis(dimethylaminopropyl) Isopropanolamine Abstract Rigid polyurethane (PU) foams are widely used in various industries due to their excellent thermal insulation properties, mechanical strength, and cost-effectiveness. However, these foams often suffer from limitations in thermal stability and dimensional accuracy, which can compromise their performance in...