æɾ ˈɛlɪvˌeɪɾᵻd tˈɛmpɹɪtʃɚz, ɪt ɹɪˈækts wɪð klˈoːɹiːn ɪnðə pɹˈɛzəns ʌv ɡɹˈæfaɪt ɔːɹ kˈɑːɹbən tˈɛtɹɐklˌoːɹaɪd tə ɡˈɪv hˈæfniəm tˈɛtɹɐklˌoːɹaɪd.
At elevated temperatures, it reacts with chlorine in the presence of graphite or carbon tetrachloride to give hafnium tetrachloride.