Used as a catalyst in the production of polyester compounds, especially in the synthesis of polyethylene terephthalate (PET) for plastics and fibers. It offers high efficiency in promoting esterification and polycondensation reactions. Also applied in flame retardant formulations, where it works synergistically with halogenated compounds to enhance fire resistance in textiles, plastics, and electronic materials. In some cases, utilized in semiconductor doping processes and in the manufacturing of antimony-based oxide coatings for specialized industrial applications.