Used as a catalyst in organic synthesis, particularly in Friedel-Crafts reactions and halogenation processes. Employed in the production of flame retardants, where it enhances the fire resistance of polymers and textiles. Acts as a reagent in analytical chemistry for the detection of vitamin A and related compounds through the Carr-Price test. Utilized in the manufacturing of antimony-based chemicals and specialty glasses with infrared transmission properties. Also applied in the electronics industry for semiconductor doping and thin-film deposition processes.