Zirconium propionate

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Zirconium propionate is a white powder with molecular formula Zr(CH₃CH₂COO)₄. Its structure is complex, but is believed to be based on hydroxy-bridged zirconium polymers, with the propionate carboxyl group bonded to the zirconium. Propionates are salts or esters of propionic acid. It is not soluble in water, but dissolves in a solution of isopropanol, ethanol and ethyl acetate. When tamped or untamped, it has a density of 1.14 g/cm³ or 0.98 g/cm³ respectively. It is used to promote adhesion in solvent-based inks. Impurities of Hafnium are commonly present.