Tusmada caadiga ah ee alumina cad ee la isku daray waa aluminium, sodium, potassium, silicon, bir iyo wixii la mid ah, kuwaas oo kuwa ugu caansan uguna ballaaran ee laga wada hadlo ay tahay xaddiga soodhiyamka, taas oo la arki karo in soodhiyamka uu saameyn weyn ku leeyahay tayada alumina cad ee la isku daray. Waqtigan xaadirka ah, alumina cad ee la isku daray ee suuqa ku jirta waxaa lagu kala saaraa soodhiyamka, iyadoo soodhiyamka uu ku jiro 0.35%, soodhiyamka uu ku jiro 0.3%, soodhiyamka uu ku jiro 0.2% iyo soodhiyamka uu ku jiro 0.1% darajooyin dhowr ah, codsiyada kala duwan ee badeecadaha waxay yeelan doonaan shuruudo kala duwan oo ku saabsan soodhiyamka, markaa iyadoo loo eegayo tirada soodhiyamka ee kala duwan, waxaa laga soocaa alumina cad ee la isku daray ee caadiga ah,alumina cad oo la isku daray oo sodium yariyo alumina cad oo micro-sodium ah oo la isku daray, iwm.
Sodiyamka ku jira alumina cad ee la shiiday waxaa inta badan laga helaa sodium oksaydh oo laga helo alumina warshadaha. Sodiyamka oksaydhka waxaa loo isticmaalaa habka dhalaalinta alumina cad ee la shiiday si loo soo saaro sodium aluminate sare si loo yareeyo soo saarista alumina (α-Al2O3) ee alumina cad ee la shiiday, taasoo keenta in aluminiumku hooseeyo sidaas darteedna uu saameeyo waxqabadka alumina cad ee la shiiday. Xakamaynta sodium yar ee alumina cad ee la shiiday waxay kordhisaa waqtiga dhalaalinta, laakiin kororka ka dhasha isticmaalka korontada wuxuu kordhiyaa kharashka wax soo saarka dhalaalinta; ama isticmaalka tooska ah ee sodium yar ee alumina warshadaha, laakiin qiimaha suuqa ee sodium yar ee alumina warshadaha ayaa sidoo kale qaali ah.
XINLI waxay soo saartaa micro-sodiumalumina cad oo la isku darayoo leh maaddada sodium oksaydh oo ah 0.1% ama ka yar, taas oo ku habboon farsamaynta birta dahaarka leh, birta adag ee sare, birta kaarboonka sare leh iyo agab kale oo leh adkeysi sare iyo xoog jiidis, waxayna leedahay astaamo aad u fiican sida adkeysi sare, fiiqan sare iyo awood ka hortag gubasho.