Dolomite Brick

Dolomite Brick

Dolomite is a magnesium limestone (CaMgCO3). It occurs in nature. Calcined dolomite brick particles are united with the help of silicate binders and water.

Mixture is then molded to bricks which are air dried and burnt to temperature ranging between 1200 to 1560oC for about one day which gives stabilized dolomite bricks. Such bricks are quite stable towards basic slag.


  • Dolomite bricks are more porous, more shrinkage softness and less stronger than magnesia bricks.
  • They can be used up to 2300oC without load and up to 1650oC with load.


Dolomite is generally used as a repairing material rather than as a direct refractory because of its defects like porosity, shrinkage and softness. However stabilized dolomites are used in electric furnaces, Bessemer converters, open hearth furnaces etc, cheap substitute for magnesia bricks.


Dolomite Brick

Chemical Analysis

AL2O3 MIN   1 %
Fe2O3 Max    1.50 %
SiO2 Max  1  %


CaO2 Min   53 % 
MgO Min   38 %

Physical Properties

Bulk Density (Db.) g/cm3   min2.85
Apparent Porosity (Po.) Vol-%   max 8
Cold Crushing Strength at 20(c.c.s) kg/cm2   min 150
Total Carbon %          4-6
Residual Crabon (after finig at 1000) %         1.5-4
Storage Limit days        14-45