Mullite Insulation Bricks

Mullite insulating bricks are made primarily from high-quality mullite. They are formed using either the foaming method or a process involving pore-forming agents, and then sintered at high temperatures. The main crystalline phase is mullite (3Al₂O₃·2SiO₂). These products combine high operating temperatures with excellent thermal insulation properties, making them an ideal energy-saving material for thermal insulation in the high-temperature zones of glass melting furnaces.

Key Features:

High Operating Temperature: The mullite crystal phase provides the product with excellent high-temperature stability, enabling operating temperatures of over 1500°C—far exceeding those of ordinary clay refractory bricks. It can be used directly in high-temperature areas such as the upper sections of regenerative chambers.

Low Thermal Conductivity and High Energy Efficiency: A uniform microporous structure significantly reduces the thermal conductivity, effectively blocking heat transfer and substantially reducing heat loss from the furnace surface, resulting in outstanding energy savings.

Excellent High-Temperature Strength: The mullite network structure maintains high mechanical strength even at high temperatures, ensuring no deformation or softening during long-term use, making it suitable for load-bearing insulation sections.

Outstanding Thermal Shock Resistance: The combination of low bulk density and uniform porosity results in a low coefficient of thermal expansion, effectively absorbing stresses caused by rapid cooling and heating, preventing cracking or spalling.

Pure and Low-Pollution: With low impurity content, it does not release harmful gases or glass phases at high temperatures, ensuring the kiln atmosphere remains uncontaminated.

Applications:

Insulation layers in the upper section of glass melting furnace regenerators, high-temperature backing for melting tank walls, insulation layers for large arches, thermal insulation layers in the high-temperature section of furnace bottoms, and insulation around inspection ports and burner bricks—specifically in medium-to-high-temperature areas not in direct contact with molten glass. Suitable for high-efficiency, energy-saving masonry in float glass, bottle and jar glass, tableware glass, and specialty glass melting furnaces.