Babban abu na acidic, tsaka tsaki da alkaline rufi kayan

Acid rufi abu: tetravalent fili SiO2, ZrO2, da dai sauransu, siliceous, Semi-Silica, yumbu, zirconium, Semi-zirconium.

Abubuwan da ke tsaka tsaki: trivalent mahadi Al2O3, Cr2O3 da ƙarfi covalent bond crystalline ma’adanai C, SiC, high aluminum, corundum, chromium, carbon, silicon carbide, silicon nitride, da dai sauransu.

Alkaline rufi kayan rufi: divalent mahadi CaO, MgO, da dai sauransu, magnesia, dolomite, magnesia aluminum, magnesia chromium.