Is cineál ábhar teasfhulangach é brící ard-alúmana, agus is é Al2O3 príomh-chomhpháirt an bríce teasfhulangacha seo.
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 faoin gcéad ; Is é 60-75 faoin gcéad ábhar Aicme II - Al2O3 ; Grád III - Is é 48-60 faoin gcéad ábhar Al2O3 .
