Hár súrál Sk37 eldföst múrsteinn fyrir glerbræðsluofn

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 prósent; Innihald Ⅱ og Al2O3 er 60 ~ 75 prósent; Ⅲ -- Al2O3 innihald er 48 ~ 60 prósent.