Al2O3 content is 30%-48%, SiO2 content is 50%-65%, and a small number of alkali metals, alkaline earth metal oxides, etc.
Mineral composition is usually mullite, quartz and glass phase. Its refractoriness is 1580-1750°C, refractoriness under load is 1250-1450 °C, line expansion coefficients is low, with good thermal shock resistance and strong ability to resist erosion acid slag.
This brick with high strenght and thermal conductivity, which can be widely applied for different kiln as insulating layer.
Size can be made according to requirements
High strength at high temperature
Corrosion and spalling resistance
can be used both as building brick and insulating brick
According to smelting condition and the kind of smelting steel, different brands and shapes refractory bricks are available