Thermal-sensitive catalyst SA-1: Strategies to reduce defects in polyurethane products Introduction Polyurethane (PU) is a multifunctional material widely used in automobiles, construction, furniture, footwear and other fields. However, various defects are often encountered in the production process of polyurethane products, such as bubbles, shrinkage holes, uneven surfaces, etc. These defects not only affect the appearance...