Alumina Silicate Board For High Temperature Insulation

Aug 2, 2023

Alumina silicate board is a type of high temperature insulation board made from raw materials like kaolin clay, quartz and alumina, fired at extremely high temperatures. The finished product consists of small interlocking ceramic fibers that provide excellent thermal insulation properties, high compressive strength and durability in harsh environments.

High Temperature Calcium Silicate Board

Key Features Of Alumina Silicate Board

• High temperature resistance – Can withstand long term temperatures up to 1200°C/2192°F and short term temperatures up to 1,400°C/2,552°F.

• Chemical resistance – Resists corrosion from acids, alkalis and salts when properly installed.

• Non-combustible – Made from ceramic fibers that will not burn, melt or produce smoke when exposed to high heat.

• Low thermal conductivity – Keeps heat from transmitting through the board, making it an effective insulator. Has a thermal conductivity of 0.07 – 0.15 W/mK.

• Moisture resistance – Ceramic composition sheds water and resists absorbing moisture, minimizing deterioration over time.

• Compressive strength – Withstands compression loads of up to 10 MPa, depending on board thickness.

• Minimal material expansion – Ceramic fibers have low linear expansion, reducing stresses from heat cycling.

Common Alumina Silicate Board Applications

• High temperature industrial insulation – Used to line walls, ceilings and floors inside gas fired ovens, kilns, furnaces and other high heat equipment.

Fireproof insulation board – Provides 2 hour fire resistance for walls, floors and ceilings, meeting international fire codes.

• Heat shields – Installed behind or around hot surfaces like pipes, valves and machine components to protect adjoining areas.

• Pizza oven insulation – Used to line domestic and commercial wood-fired ovens due to its ability to handle extreme heat.

• BBQ grill insulation – Provides heat retention inside ceramic BBQ smokers and kamado style ceramic board insulation grills.

• Stove insulation – Installed behind and around commercial and residential gas or wood stoves.

Alumina Silicate Board Types

Different types and grades of alumina silicate board are available to suit various applications:

• Low density boards – Thinner boards with lower insulation values, usually 6-16 kg/m3. Used for lining ovens up to 1100°C.

• Medium density boards – Provide moderate insulation, typically 16-32 kg/m3. Can handle temperatures up to 1200°C.

• High density boards – Higher compressive strength boards , 32-96 kg/m3. Suitable for temperatures up to 1400°C.

• Special grades – Formulations resistant to acids, alkalis and other corrosive chemicals are also available.

Important Attributes to Consider

When choosing alumina silicate board for a specific application, consider these key attributes:

Density – Higher density boards provide greater compressive strength but less insulation. Select the appropriate density for your needs.

Temperature resistance – Check the maximum operating temperature the board is rated for. Add a safety factor of at least 100°C for short term heat exposure.

Board thickness – Thicker boards offer higher insulation values but are more difficult to cut and install. Common thicknesses range from 12 to 200 mm.

Joint technique – Most manufacturers recommend using ceramic fiber rope or paper to seal joints for maximum heat resistance.

Fastening method – Use high temperature resistant adhesives, anchors or self-tapping screws to securely fasten boards in place.

Protective coating – Some boards have a thin coating to protect edges from damage during handling and installation.

The Key Differences Between High Temperature Calcium Silicate Board And Alumina Silicate Board

Material composition:
• Calcium silicate board is made from calcined kaolin clay and limestone. It contains calcium, silicon and oxygen.
• Alumina silicate board is made from kaolin clay, quartz and alumina. It contains aluminum, silicon and oxygen.

Maximum temperature resistance:
• Calcium silicate board can typically withstand temperatures up to 1,100 – 1,200°C. So normally it may use for calcium silicate board pizza oven.
• Alumina silicate board can withstand higher temperatures, up to 1,400 – 1,500°C.

Conclusion Of  Alumina Silicate Board With Insulation

In summary, alumina silicate board provides an excellent combination of thermal insulation, high temperature resistance, durability and fire protection for industrial processes and commercial equipment. By understanding its key features and attributes, you can select the right grade of alumina silicate board to insulate ovens, furnaces and other high heat applications.