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Mullite insulating bricks are a type of refractory brick that are widely used for insulation purposes in high-temperature applications. They are composed primarily of mullite, which is a mineral compound of alumina (Al2O3) and silica (SiO2). Here's what you need to know about mullite insulating bricks:

  • Insulating properties: Mullite insulating bricks are known for their excellent insulating properties. They have low thermal conductivity, which helps to reduce heat transfer through the brick, making them effective in conserving energy and maintaining temperature differentials.

  • High-temperature resistance: Mullite insulating bricks are capable of withstanding high temperatures. They can typically withstand temperatures up to 1600°C (2912°F) and are often used in applications where insulation is required at elevated temperatures.

  • Low thermal expansion: Mullite insulating bricks have a low coefficient of thermal expansion, meaning they do not significantly expand or contract with changes in temperature. This property helps to reduce the risk of cracking or spalling due to thermal stress.

  • Lightweight: Mullite insulating bricks are lightweight compared to other refractory materials. This makes them easier to handle and install, reducing the overall weight of the construction and minimizing the structural load.

  • Low density: Mullite insulating bricks have a low bulk density, which contributes to their excellent insulating properties. The low density helps to reduce heat transfer and improves energy efficiency.

  • Good thermal shock resistance: Mullite insulating bricks have good thermal shock resistance, allowing them to withstand rapid temperature changes without cracking or spalling. This property is important in applications where the brick may be exposed to thermal cycling.

  • Chemical stability: Mullite insulating bricks are chemically stable and resistant to most chemical reactions. They have good resistance to acids, alkalis, and other corrosive substances, making them suitable for a wide range of applications.

  • Versatility: Mullite insulating bricks are versatile and find applications in various industries, including ceramics, metallurgy, petrochemical, and glass manufacturing. They are used in kilns, furnaces, heat treatment equipment, and other high-temperature processes where thermal insulation is required.

Overall, mullite insulating bricks are valued for their excellent insulating properties, high-temperature resistance, low thermal expansion, and lightweight nature. They provide effective thermal insulation in a wide range of industrial applications, contributing to energy efficiency and improved process performance.


Buy good quality low cost mullite insulation bricks with very high compressive strength, high temperature performance and good thermal shock stability.


Mullite Insulating Brick
Part NumberAL2O3(%)Fe2O3(%)Bulk Density (g/cm³)Cold Crushing Strength (Mpa)Permanent Linear Change(%)


Mullite Insulating Brick

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