Idan abun ciki na Al2O3 ya fi 90% girma, ana kiran shi tubalin corundum. Saboda albarkatu daban-daban, ma'auni na ƙasashe daban-daban ba su da daidaito. Alal misali, ƙasashen Turai sun tsara cewa ƙananan iyaka na abun ciki na Al2O3 don manyan alumina refractories shine 42%. A kasar Sin, manyan bulogin alumina yawanci suna magana ne akan tubalin da ke da alaƙa da abun ciki na Al2O3 na sama da 48%. An yi su ne da bauxite mai daraja na halitta, wanda ya ƙunshi ma'adanai irin su diaspore, bomerite, kaolinite, da dai sauransu. Ana saka yumbu mai laushi ko mai laushi a cikin babban alumina clinker a matsayin abin ɗaure don fara batching da hadawa, sa'an nan kuma shi. an kafa, bushe, kuma a karshe ya kori. A refractoriness na high alumina tubalin ne game da 1770 ℃, da kuma load softening zafin jiki ne 1420 ℃-1550 ℃. Common high alumina tubalin ne LZ-80, LZ-75, LZ-65, LZ-55, LZ-48, da dai sauransu An yafi amfani da rufi fashewa makera, zafi tsãwa makera, ore-zafi tanderun, lantarki tanderun rufin, fashewar tanderu, reverberatory makera da rotary kiln. Bugu da kari, manyan bulogin alumina kuma ana amfani da su sosai azaman bulogin ajiyar zafi na buɗe wuta, matosai don tsarin zubowa, bulogin bututun ƙarfe, da sauransu.