Lightweight High Alumina Brick

      Lightweight high alumina bricks, also known as high-alumina insulating bricks, are lightweight refractory and insulation products made primarily from bauxite, with an Al₂O₃ content of not less than 48%. They are generally divided into two types: ordinary lightweight high-alumina bricks made from natural high-alumina bauxite clinker, and high-quality lightweight high-alumina products made from electrofused or sintered alumina. The latter are also referred to as lightweight corundum bricks because their main crystalline phase is corundum.

      Lightweight high-alumina bricks are typically produced from high-alumina bauxite clinker with a small amount of clay. The raw materials are finely ground and formed into a slurry using a gas-generation or foaming method, followed by firing at 1300–1500 °C. In some cases, industrial alumina can be used to replace part of the bauxite clinker. These bricks are mainly used for kiln linings and insulation layers, especially in areas that are not exposed to severe erosion or scouring by molten materials at high temperatures. When in direct contact with flames, the surface temperature should not exceed 1350 °C.

      The standard dimensions of lightweight high-alumina bricks are 230 × 114 × 65 mm. Typical technical parameters include a bulk density of 0.4–1.35 g/cm³, porosity of 66%–73%, compressive strength of 1.3–8.1 MPa, thermal conductivity of 0.291–0.582 W/(m·K) at 350 °C, and a service temperature of 1350–1500 °C. 

High refractoriness

Excellent thermal shock resistance

Good thermal insulation performance

High porosity, low bulk density, and light weight

Easy installation and can be cut or processed to the required size

      Lightweight high-alumina bricks are mainly used for insulation layers and for areas that are not exposed to severe erosion or scouring by molten materials at high temperatures. When in direct contact with flames, the surface temperature of standard high-alumina insulating bricks should not exceed 1350 °C.

      They are suitable for linings in pyrolysis furnaces, hot blast stoves, ceramic roller kilns, electric porcelain kilns, and various resistance furnaces.

· Inspect the appearance and dimensions of the bricks before installation.

· Use matching refractory mortar for masonry.

· Properly set expansion joints.

· Avoid strong mechanical impact.

· The initial heating process should be carried out slowly.

Q1: What are the main differences between lightweight high-alumina bricks and dense high-alumina bricks?
A: Lightweight high-alumina bricks have a lower bulk density and better thermal insulation performance. However, their load-bearing capacity is slightly lower than that of dense high-alumina bricks.

Q2: Can they be used as a working lining?
A: Yes. They can be used as a working lining under medium- to high-temperature conditions where the mechanical load is low and corrosion is mild.

Q3: What is the operating temperature range?
A: They are suitable for medium- to high-temperature applications. The specific temperature resistance grade can be selected according to the product formulation.

Q4: How should I choose between lightweight high-alumina bricks and lightweight mullite bricks?
A: Lightweight high-alumina bricks generally offer higher refractoriness, while lightweight mullite bricks provide better thermal shock resistance. The selection should be based on the specific working conditions.

Q5: Do you support OEM/ODM cooperation?
A: Yes. We fully support OEM and ODM services and can provide flexible solutions ranging from product customization to full-process support based on customer requirements.

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