Dense refractory brick is divided into ordinary clay refractory bricks, clay brick, high dense clay refractory bricks, silica brick, magnesite brick, alumina magnesia carbon brick, the volume density of each are not identical, some soft, some qualitative hard.
Adopted by different kinds of raw materials according to the production of refractory brick, the brick volume density is different also, general refractory before they go out, measuring its bulk density, volume density, said drying products quality and the ratio of the total volume, expressed in g/cm3, volume density index is a major index representing the degree of product density, the density is high, can reduce the external invasion of slag, etc.
Common clay brick is 1.8 ~ 2.0 g/cm3, dense clay brick generally is 2.05 ~ 2.20 g/cm3, high density of clay brick is 2.25 ~ 2.30 g/cm3, silica brick generally is 1.80 ~ 1.95 g/cm3, magnesite brick generally is 2.60 ~ 2.70 g/cm3, alumina magnesia carbon brick generally is 2.90 ~ 3.00 g/cm3, product volume density index is the product of porosity volume and the comprehensive reflection of mineral composition, due to the relatively easy to measure, usually in the production as a way to judge products sintering degree.