I-aluminium oxide iyinto engaphili enefomula yamakhemikhali i-A1203, inhlanganisela eqinile kakhulu enephuzu lokuncibilika elingu-2054°C kanye nephuzu lokubila elingu-2980°C. Iyikristalu ye-ionic engabai-ionizedemazingeni okushisa aphezulu futhi ivame ukusetshenziswa ekukhiqizeni izinto eziphikisayo. I-alumina ene-calcined kanye ne-alumina zombili ziqukethe into efanayo, kodwa ngenxa yezindlela ezithile zokukhiqiza kanye neminye imikhakha yenqubo, ukuze kokubili kusetshenziswe ukusebenza ngakho-ke kuzoba nomehluko othile.
I-Alumina iyiminerali eyinhloko ye-aluminium ngokwemvelo, izochotshozwa futhi ifakwe isixazululo se-sodium hydroxide esishisayo kakhulu ukuze kutholakale isixazululo se-sodium alumina; hlunga ukuze ususe okusele, upholise i-filtrate bese ufaka amakristalu e-aluminium hydroxide, ngemva kwesikhathi eside uvuselela, isixazululo se-sodium alumina sizobola futhi sinciphise i-aluminium hydroxide; hlukanisa i-precipitate bese uyigeza, bese uyi-calcium ku-950-1200°C ukuze uthole i-c-type alumina powder, i-calcined Alumina iyi-c-type alumina. Amaphuzu okuncibilika nokubila aphezulu kakhulu.
I-alumina ene-calcined ayincibiliki emanzini nase-asidi, eyaziwa nangokuthi i-aluminium oxide embonini, futhi iyinto eluhlaza eyisisekelo yokukhiqiza insimbi ye-aluminium; ingasetshenziswa futhi ekukhiqizeni izitini ezahlukahlukene eziphikisayo, izitsha eziphikisayo, amashubhu aphikisayo kanye nezinsimbi zelebhu ezingamelana nokushisa okuphezulu; ingasetshenziswa futhi njenge-abrasive, i-flame retardant kanye ne-filler; i-alumina ene-calcined ehlanzekile kakhulu futhi iyinto eluhlaza yokukhiqiza i-corundum yokwenziwa, itshe elibomvu eliyi-artificial kanye netshe eliyi-blue master; isetshenziselwa futhi ukukhiqizwa kwezingxenye zebhodi zezifunda ezinkulu zanamuhla ezihlanganisiwe. I-alumina ene-calcined kanye ne-alumina enqubweni yokukhiqiza nezinye izici zihlukile kancane, izindawo zemboni ezisebenzayo nazo zihlukile, ngakho-ke ekuthengweni kwemikhiqizo ngaphambi kokuqala ukuthola izindawo ezithile zokusetshenziswa.