Lebenka sare{0}alumina waa nooc ka mid ah walxo refractory oo qaabaysan oo lagu shido dhoobada refractory ama alaabta ceeriin ee kale ee heerkulka sare leh; waxay ka tirsan yihiin qoyska alaabta aluminosilicate. Lebenka dib u celintu waa walxo aan dabiici ahayn oo aan - bir ah oo laga heli karo noocyo kala duwan, oo ay ku jiraan{3} alumina, dhoobo, magnesia, corundum, mullite, iyo leben carbide silicon. Sababo la xiriira sifadooda sare-u-kicinta, lebennada sare -alumina ayaa si weyn loo adeegsadaa noocyada kala duwan ee lebenka refractory. Marka loo eego heerarka sare -alaabada aluminiumka refractory, waxa ku jira Al₂O₃ waa heerka kala soocida muhiimka ah. Gaar ahaan, lebenka sare - alumina lebenka waxa loo kala saaraa saddex darajo: Fasalka I (Al₂O₃ content> 75%), Fasalka II (Al₂O₃ content inta u dhaxaysa 60% iyo 75%), iyo Fasalka III (Al₂O₃ ka kooban 48% iyo 60%).
Nooc ka mid ah walxaha dib-u-celinta, lebennada sare -alumina waxay ka kooban yihiin Al₂O₃. Marka la barbar dhigo lebenka dhoobada ah iyo lebenka silica ah,- lebenada sare ee aluminiumku waxa ay muujinayaan refractorism sare oo sidaas awgeed waxaa lagu sifeeyay inay yihiin kuwo sare -qalabka refractory. Waxa ay ku jiraan Al₂O₃ sare waxa ay siinaysaa - sifooyin dhexdhexaad ah, taas oo u sahlaysa iska caabbinta wax ku oolka ah ee nabaadguurka ee aysidhka iyo asaaska labadaba. Si kastaba ha ahaatee, waxaa xusid mudan in inkastoo ay ka kooban tahay SiO₂, caabbinta ay u leeyihiin slag aasaasiga ah ayaa wax yar ka hooseeya caabbinta caabbinta acidic. Iyada oo ku saleysan nuxurka Al₂O₃, lebennada sare -alumina waxaa loo sii kala qaybin karaa darajooyin sida 55, 65, 75, iyo 80.
Lebenka sare{0}alumina waxaa loo kala saaraa darajooyin kala duwan iyadoo lagu salaynayo Al₂O₃ (aluminium oxide). Waxaa ka mid ah, lebenka corundum - leh aluminium ka kooban 90% ama ka sareeya-waxay ka dhigan yihiin lebenka ugu sareeya-alumina. "Darajada gaarka ah" sare {{7} lebenka aluminium ka kooban yahay ugu yaraan 85% aluminium, halka Fasalka I leben ka kooban yahay in ka badan 75%; Lebenka Fasalka II iyo Fasalka III waxay ka kooban yihiin ugu yaraan 65% iyo 55% aluminium, siday u kala horreeyaan. Darajooyinkan kala duwan waxay bixiyaan siyaalo kala duwan oo dib u celin ah si ay u buuxiyaan shuruudaha warshadaha kala duwan. bulukeetiyada sare - waa nooc ka mid ah alaabada refractory aluminosilicate oo lagu garto aluminium oxide (Al₂O₃) ka kooban 48%. Marka waxa ku jira Al₂O₃ ay gaadhaan 90% ama ka sareeya, waxa loo kala saaraa sida lebenka corundum{18}}kala duwan oo leben sare{19}}alumina oo bixiya waxqabad aan caadi ahayn. Waxaa xusid mudan in halbeegyada bulukeetiyada aluminiumka sare - laga yaabo in ay ku kala duwanaan karaan wadamada oo dhan sababtoo ah kala duwanaanshiyaha ilaha la heli karo.
Tusaale ahaan, wadamada Yurub, waxa ugu yar ee Al₂O₃ ee ah agabka refractory{{0}alumina waxa lagu dejiyey 42%. Shiinaha, si kastaba ha ahaatee, lebenka sare - alumina lebenka ayaa sida caadiga ah loo kala saaraa saddex darajo: Fasalka I lebenka waxa ku jira in ka badan 75% Al₂O₃; Lebenka fasalka II waxa ay ka kooban yihiin inta u dhaxaysa 60% iyo 75% Al₂O₃; iyo lebenka Fasalka III waxa ay ka kooban yihiin inta u dhaxaysa 48% iyo 60% Al₂O₃.