Used as a source of tungsten in catalysts for petroleum refining and chemical synthesis, particularly in hydrodesulfurization processes. Employed in the production of tungsten-based pigments and corrosion inhibitors. Applied in electroplating baths to deposit tungsten or tungsten-iron alloys for wear-resistant coatings. Serves as a precursor in the synthesis of other tungsten compounds and in the manufacturing of specialty glasses and ceramics with high thermal and electrical resistance. Also utilized in research as a selective inhibitor of phosphate transport in biological systems.