I-aluminium oxide yinto engaphiliyo enefomyula yekhemikhali i-A1203, ikhompawundi eqinileyo kakhulu eneqondo lokunyibilika elingama-2054°C kunye neqondo lokubila elingama-2980°C. Yikristale ye-ionic enokubai-ionizedkubushushu obuphezulu kwaye isetyenziswa kakhulu ekwenzeni izinto ezichasayo. I-alumina ene-calcined kunye ne-alumina zombini ziqulathe into efanayo, kodwa ngenxa yeendlela ezithile zemveliso kunye nezinye iiyantlukwano zenkqubo, ukuze zombini zisetyenziswe ekusebenzeni kwaye ngoko ke kuya kubakho umahluko othile.
I-Alumina yeyona minerali iphambili ye-aluminium kwindalo, iya kutyunyuzwa ize ifakwe isisombululo se-sodium hydroxide esishushu kakhulu ukuze kufunyanwe isisombululo se-sodium alumina; hluza ukuze ususe intsalela, upholise i-filtrate uze wongeze iikristale ze-aluminium hydroxide, emva kwexesha elide uvuselela, isisombululo se-sodium alumina siya kubola size sibangele i-aluminium hydroxide; yahlula i-precipitate uze uyihlambe, uze uyinyibilikise kwi-950-1200°C ukuze ufumane umgubo we-alumina wohlobo lwe-c, i-Alumina ene-calcined yi-c-type alumina. Amanqaku okunyibilika nokubila aphezulu kakhulu.
I-alumina e-calcined ayinyibiliki emanzini nakwi-asidi, ekwaziwa ngokuba yi-aluminium oxide kushishino, kwaye yeyona nto iphambili yokwenza isinyithi se-aluminium; ingasetyenziselwa ukuvelisa izitena ezahlukeneyo ezichasene ne-refractory, ii-crucibles ezichasene ne-refractory, iityhubhu ezichasene ne-refractory kunye nezixhobo zelebhu ezimelana nobushushu obuphezulu; ingasetyenziselwa njengento erhabaxa, ethintela ilangatye kunye ne-filler; i-alumina e-calcined ecocekileyo kakhulu ikwayindlela yokwenza i-corundum yokwenziwa, ilitye elibomvu eliyi-artificial kunye nelitye eliluhlaza okwesibhakabhaka; ikwasetyenziselwa ukuvelisa ii-substrates zebhodi zeesekethe ezinkulu zanamhlanje. I-alumina e-calcined kunye ne-alumina kwinkqubo yemveliso kunye nezinye izinto zahlukile kancinci, iindawo zoshishino ezifanelekileyo nazo zahlukile, ngoko ke ekuthengweni kweemveliso ngaphambi kokuqala ukuze kufunyanwe iindawo ezithile zokusetyenziswa.