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Insulating Bricks for High Temp Kilns and Furnaces

As an important product in high temperature kilns and furnaces, the insulating bricks are considered crucial. This product also calls lightweight insulation brick, soft insulation brick, insulating fire brick and so on. Unlike refractory bricks, the thermal conductivity of insulation brick is very low. Therefore, it’s an ideal material to masonry the structure of high temperature kilns. Now you can learn more information about this product and its uses.

Insulating Bricks for High Temp Kilns and Furnaces
Insulating Bricks for High Temp Kilns and Furnaces

Description of Insulation Bricks in High Temp Kilns and Furnaces

Insulating bricks are generally used in conjunction with refractory bricks as the structure of industrial kilns. A common application is to use refractory bricks as the first layer of a kiln – exposed to high temperatures. This is why we require the refractory bricks to meet the requirements.

Insulating bricks are built on the outer layer to reduce heat loss, distribute temperature evenly and prevent damage to the kiln structure. Due to its unique structure, lightweight ifb bricks are lighter in weight and less difficult to construct.

According to different composition, we can divide these bricks into the following types. Besides, we make a clear comparison of each product.

Name High Alumina Insulation Brick Fire Clay Insulation Brick Mullite Insulation Brick Alumina Bubble Brick Silica Insulation Brick
Pictures KERUI High Alumina Insulation Brick KERUI Clay Insulation Brick KERUI Mullite Insulation Brick KERUI Alumina Bubble Brick KERUI Silica Insulation Brick
Main Content ≥48% Al2O3 30%-46% Al2O3 40%-77% Al2O3 90%-99% Al2O3 ≥91% SiO2
Bulk Density 0.5-1.2 g/cm³ 0.5-1.5 g/cm³ 0.5-1.35 g/cm³ 1.3-1.9 g/cm³ 1.0-1.2 g/cm³
Thermal Conductivity Coefficient 0.2-0.55 W/(m·K) 0.23-0.65 W/(m·K) 0.18-0.56 W/(m·K) 0.9-1.2 W/(m·K) 0.55-0.7 W/(m·K)
Cold Crushing Strength 1.0-4.5 MPa 0.8-6.0 MPa 0.9-3.5 MPa 6-18 MPa 2-5 MPa

Common Uses of Kerui Insulation Bricks

Generally speaking, insulation bricks do not directly contact high-temperature molten substances and parts with severe chemical corrosion. During the construction process of the kiln, refractory brick linings serve as the innermost refractory layer, and insulating bricks are used in the insulation layer to save energy and maintain stable operation of the kiln. The following are the applications for different products:

High Alumina Insulation BrickUsed in insulation layer of industrial kilns like ceramic tunnel kilns, roller kilns, shuttle kilns, wall kilns, etc. As well as other locations without strong erosion of high-temperature molten materials.
Fire Clay Insulation BrickOften used as the insulation layer of thermal equipment such as ignition kilns, flues, refining devices, heating devices, gas furnaces and pipelines, soaking furnaces, annealing furnaces, reaction chambers, etc.
Mullite Insulation BrickSuitable for the refractory lining and backing insulation layer of pyrolysis furnaces, hot blast furnaces, ceramic roller kilns, electric porcelain drawer kilns and various industrial resistance furnaces.
Alumina Bubble BrickCommonly used as the working layer and heat insulation layer of high temperature kilns in petrochemical industry gasifiers, carbon black reactors, metallurgical induction furnaces and other industries.
Silica Insulation BrickCommonly used in coke oven insulation layers, glass kiln vaults, hot blast furnace walls and domes. It does not directly contact high-temperature molten materials and alkaline gas working layers.


All in all, the insulation brick has been an integral part of high temperature applications. If you want a professional and customized solution, why not consider KERUI. As a reliable insulation bricks manufacturer in China, we’re confident to offer these products with excellent quality as well as considerate service.

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