Hafnium tetrachloride (HfCl₄) is a white, crystalline, and highly moisture-sensitive solid that serves as a fundamental precursor in hafnium chemistry. It is primarily produced for the industrial Kroll process, where it is reduced with magnesium to obtain pure hafnium metal. https://www.noahchemicals.com/product/hafnium-iv-chloride-99-95-pure-80-mesh-hafnium-tetrachloride-hfcl%e2%82%84/