Antimony Trioxide (Sb₂O₃) is a versatile flame retardant and synergist used in a wide range of applications, including plastics, rubber, textiles, and coatings. It enhances fire resistance and reduces smoke production, making it ideal for safety-critical products. Additionally, it serves as a catalyst in PET manufacturing and an opacifier in glass and ceramics, contributing to durability and opacity. Known for its efficiency and compatibility, Antimony Trioxide is a key additive in industrial manufacturing processes.