Alumina hmoov yog ib qho inorganic tshuaj nrog cov tshuaj formula Al2O3.Nws yog ib qho nyuaj hardness compound nrog lub melting point ntawm 2054 ° C thiab boiling point ntawm 2980 ° C.Nws yog ib qho siv lead ua ionic uas tuaj yeem ionize ntawm qhov kub thiab txias thiab feem ntau siv los ua cov khoom siv refractory.