Classification of refractory materials

- Jun 13, 2018-

1. Acid refractories are those which consist of acidic materials like alumina (Al2O3), and silica (SiO2). They are not attacked by acidic materials, but easily attacked by basic materials. Important members of this group are alumina, silica and fireclay refractories.


2. Basic refractories are those which consist of basic materials such as CaO, MgO, etc. These are not attacked by basic materials, but easily attacked by acidic materials. Important members of this group are magnesite and dolomite refractories.


3. Neutral refractories are made from weakly acid/basic materials such as carbon, silicon carbide (SiC), chromite (FeCr2O4) and zirconia (ZrO2).