I-alumina powder yinto engabonakaliyo kunye ne-chemical formula Al2O3.Yikhompawundi yobulukhuni obuphezulu enendawo yokunyibilika ye-2054°C kunye neqondo lokubila elingu-2980°C.Yikristale ye-ionic enokuthi i-ionize kwiqondo lokushisa eliphezulu kwaye isoloko isetyenziselwa ukuveliswa kwezinto eziphikisayo.