Kõrge alumiiniumoksiidiga tellised on teatud tüüpi tulekindlad materjalid ja selle tulekindla tellise põhikomponent on Al2O3.
If the Al2O3 content is higher than 90%, it is called corundum brick. Due to different resources, national standards are not completely consistent. For example, European countries have set a minimum Al2O3 content of 42% for high alumina refractory materials. In China, the Al2O3 content in high alumina bricks is usually divided into three classes: Class I - Al2O3 content>75 protsenti; II klass - Al2O3 sisaldus on 60-75 protsenti; III aste – Al2O3 sisaldus on 48-60 protsenti.
