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Such as Al2O3 content is higher than 90%, called corundum brick. Because of different resources, the standards are not entirely consistent. For example, European countries on high alumina refractory provisions Al2O3 content limit of 42%. In China, Al2O3 content in high alumina bricks is usually divided into three classes: Ⅰ ──Al2O3 content >75 foiz; Ⅱ va Al2O3 ning tarkibi 60 ~ 75 foizni tashkil qiladi; Ⅲ -- Al2O3 miqdori 48 ~ 60 foizni tashkil qiladi.