The refractoriness of high alumina brick is higher than clay bricks and half silica brick , it can reach to 1750 ~ 1750 ℃, so it belongs to high-grade refractory materials.
b.refractoriness under load
Because there is so much Al2O3 in the high aluminum products, there is little miscellaneous quality, and forming a fusible vitreous less, so the refractoriness under load is higher than clay brick, but not because of mullite crystal form reticular tissue, so the silica refractoriness under load is still not high.
C. slag resistance
There is so much Al2O3 in high alumina brick, close to neutral refractory, slag resistance to acid and alkaline slag erosion, it’s due to containing SiO2, so the ability of resistance to basic slag than weak ability to resist acid slag.