Standard size and squint mullite insulating bricks manufactured by our company feature good thermal shock resistance, very small shrinkage at intermittent period of high temperature kiln and furnace, and small thermal expansion, which does no harm to kiln hearth and habe good thermal insulation to high temperature kiln furnace. This kind of products are widely used in the insulation layer and inner lining of roller hearth kiln, push bat kiln, shuttle kiln in ceramic industry, and insulation layer of reheating furnace and dome, wall and warm air duct of hot blast stove in iron and steel industry, which all received good working results.

Index                    SLM-0.6   SLM-0.7   SLM-0.8   SLM-0.9   SLM-1.0   SLM-0.2
AL2O3% No less than        48       48          48       50        52        54
Fe2O3% no more than        1        1           1        1         1          1
G/cm3 Bulk density        0.6      0.7         0.8      0.9       1.0        1.2
MPa cold compressive strength no less than
                          2.2      2.3         3.2      3.7       4.0        4.5
Experiment temperature of change of re-fired curve no more than 2%
                         1350     1350         1350     1400      1400       1450
Thermal conductivity average temperature  
                         0.20     0.22         0.27      0.29     0.32       0.35