Used as a precursor in the production of tungsten metal and tungsten-based compounds, especially in the manufacturing of catalysts and pigments. Employed in electroplating processes to deposit tungsten or tungsten alloys onto surfaces for improved wear and corrosion resistance. Applied in analytical chemistry as a reagent for detecting and quantifying certain metal ions. Also utilized in the synthesis of tungsten oxide materials for use in gas sensors and smart windows due to their electrochromic properties. Finds niche use in the textile industry for flame retardant treatments and in glass manufacturing to enhance thermal and chemical stability.