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High Alumina Insulation Brick

Al2O3: ≥48%

Bulk Density: 0.6-1.0g/cm3

High porosity

Small volume density

High mechanical intensity

Small thermal conductivity

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High Alumina Insulation Brick is a lightweight insulation brick with an Al₂O₃ content of not less than 48%, a high temperature resistant heat insulation refractory material.

It uses refractory clay clinker as raw material, plastic clay as binding agent, adding appropriate amount of combustibles or foaming agent, shaped by brick press, and then sintered.


  1. High porosity.
  2. Small volume density.
  3. Good insulation effect.
  4. High mechanical intensity.
  5. Small thermal conductivity.

High Alumina Insulation Brick Specifications

Al2O3 (%)≥48≥48≥48≥48≥48
Fe2O3 (%)≤2.0≤2.0≤2.0≤2.0≤2.0
Bulk Density (g/cm3)≤1≤0.9≤0.8≤0.7≤0.6
Cold Crushing strength (Mpa)≥3.92≥3.43≥2.94≥2.45≥1.96
Thermal Conductivity Coefficient (W/mk)≤0.45≤0.45≤0.35≤0.35≤0.3
Permanent Linear Change Rate (max 2%) (℃)14001400140013501350


It is used for the construction of furnace lining and insulating layer, and the parts without erosion or scouring action of intense high temperature melting material. The surface contact temperature shouldn’t be higher than 1350℃ when it is exposed to flame directly.


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