Lightweight insulating bricks are shaped refractory products manufactured from high-alumina, mullite, or other lightweight refractory raw materials, featuring an optimized pore structure and high-temperature firing. They are primarily used as thermal insulation layers in industrial furnaces and kilns, effectively reducing energy consumption and improving overall thermal efficiency.
These bricks exhibit good deformation resistance, high flexural strength, low linear shrinkage upon reheating, low thermal conductivity, and excellent thermal insulation performance, making them ideal for industrial power plant boilers and high-temperature equipment.
In modern industrial furnace design, energy conservation and structural optimization are core requirements. Lightweight refractory bricks, by reducing bulk density, significantly decrease heat transfer losses while maintaining necessary refractory performance.
Lightweight insulating bricks generally include foamed products, which reduce the load on kilns. High-strength variants are manufactured using high-quality tabular corundum and mullite as aggregates, with a sillimanite composite matrix, special additives, and small amounts of rare-earth oxides, followed by high-pressure molding and high-temperature firing.
Common types of lightweight insulating refractory bricks include clay-based bricks, high-alumina perlite bricks, low-iron mullite bricks, high-alumina lightweight insulating bricks, and diatomaceous earth insulating bricks.
|
Bulk Density(kg/m3) |
800 |
|
|
Compressive Strength(MPa) |
Normal Temperature |
6 |
|
Thermal Conductivity(W/m.℃) |
Average Temperature 350℃±25℃ |
≤0.35 |
|
Heating Permanent Line Change ≤2%Test Temperature |
1400 |
|
|
Chemical Composition(WT%) |
Al2O3 |
≥48 |
|
Fe2O3 |
≤2.0 |
● Ultra-lightweight and lightweight, reducing load and enhancing efficiency
The density is only one-third to one-half that of traditional refractory bricks, greatly reducing the overall kiln weight, lowering steel structure investment and installation costs, and meeting the lightweight requirements of large high-temperature equipment.
● Highly efficient insulation and significant energy savings
Its low thermal conductivity design improves insulation performance by more than 40% compared to conventional refractory bricks, reducing heat loss and resulting in 15–30% fuel savings.
● Standards-compliant strength, durable and reliable
Manufactured using high-pressure molding, it provides stable compressive strength at room temperature, excellent impact and peel resistance, and a service life 15–20% longer than comparable products.
● Chemically stable and widely adaptable
Chemically inert in industrial environments, resistant to acid and alkali corrosion as well as molten metal erosion, and suitable for a wide range of high-temperature working conditions.
|
|
|
|
|
Ceramics and Glass Industry Used as thermal insulation layers and lining in ceramic tunnel kilns and glass tank furnaces to improve energy efficiency and maintain high-temperature stability. |
Metallurgical Industry Used as thermal linings in steel reheat furnaces and non-ferrous metal smelting furnaces to improve energy efficiency and protect furnace structures. |
Petrochemical Industry Used as thermal linings in cracking and conversion furnaces to enhance energy efficiency and protect furnace components. |
|
|
|
|
|
Power Industry Used as thermal linings in boiler furnaces and flue ducts to improve energy efficiency and protect furnace structures.
|
Building Materials Industry Used as thermal linings in preheater towers and calcining furnaces of cement rotary kilns and lime kilns, providing excellent insulation and protecting furnace structures. |
Other Insulation of high-temperature parts such as the dome, furnace door, and flue of industrial kilns.
|
Hot Tags: Lightweight insulating bricks, China Lightweight insulating bricks manufacturers, suppliers, factory