Polycrystalline Alumina Fiber Board For Extreme Heat Applications

Product Description：

Polycrystalline Alumina Fiber Board for Extreme Heat Applications is manufactured through wet vacuum filtration and press molding, using polycrystalline mullite bulk fibers combined with organic and inorganic binders.

The board offers high mechanical strength, excellent resistance to erosion and scouring, and good machinability for cutting and shaping. Made from chemically stable, lightweight polycrystalline refractory fibers, it provides effective thermal insulation for demanding high-temperature environments. It can be installed directly on the hot face of furnace linings, where it withstands direct exposure to high-temperature gas flows and flames.

 

Product Features:

• Low Thermal Conductivity and Energy Efficiency: Its microporous polycrystalline fiber structure limits heat transfer, reducing heat loss and helping improve energy efficiency.
• High Chemical Purity: With an Al₂O₃ content of ≥95% and extremely low impurity and shot content, the board minimizes volatile release at high temperatures, helping maintain a clean furnace atmosphere.
• Excellent Thermal Stability: Offers good thermal shock resistance and structural stability at high temperatures, with reduced susceptibility to grain coarsening and phase transformation.
• High Mechanical Strength: High-temperature sintering provides high compressive and flexural strength, helping reduce breakage and material shedding during installation and service.
• High Dimensional Accuracy: Mold-formed with a smooth surface and uniform thickness, the board is easy to cut, drill, and machine into irregular shapes for convenient installation.
• Corrosion Resistance: Resists most acidic and alkaline media, as well as reducing atmospheres, except for hydrofluoric acid and strong alkalis.
• Low Heat Capacity: Low heat capacity supports rapid heating and cooling, helping improve production efficiency and process flexibility.

 

Product Applications:

• Fine Ceramics & Electronics: Linings for ceramic sintering furnaces, pusher kilns, and roller kilns; semiconductor diffusion furnaces and heat treatment furnaces for electronic components; sintering equipment for precision ceramic devices such as MLCCs and LTCCs.
• New Energy Batteries: Calcination furnaces for lithium-ion battery positive and negative electrode materials (such as lithium iron phosphate and ternary materials); high-temperature sintering equipment for solid electrolytes.
• Metal Heat Treatment: Working linings and insulation layers for high-temperature vacuum furnaces, hydrogen furnaces, high-temperature alloy melting furnaces, and forging heating furnaces.
• Petrochemicals: Back linings, insulation, and refractory linings for high-temperature reactors such as cracking furnaces, conversion furnaces, and gasification furnaces.
• Aerospace & Military: High-temperature alloy precision casting, thermal insulation components for thermal protection systems, and insulation layers for rocket engine test benches.
• Glass & Building Materials: Insulation linings for glass melting furnaces, special glass forming equipment, and sintering furnaces for ceramic fiber products.
• Scientific Research & Experimentation: High-temperature experimental furnaces, material sintering and testing equipment, and ultra-high temperature thermal experimental devices.

 

Product Technical Parameters:

Item	Index
Classification Temperature (℃)	1600 (3000F)
Use limit (℃)	1450
Density(kg/m3)	260-600
Thermal Conductivity (w/m.k)	400 600 1000 1200	0.08 0.10 0.16 0.19
Linear shrinkage (%)	<2 (1450Cx24h)
Chemical Composition (%)	AL2O3 (%) SiO2 (%)	62 36
Modules of rupture (Mpa )	>0.3
Compressive strength(Mpa)	>0.25
Ignition loss(%)	8

 

Product Certificate：

Why Choose Us

Extensive Experience

With 33 years of manufacturing expertise and 20 years of export experience in the ceramic fiber insulation industry, SUNTHERM is a trusted and professional manufacturer of thermal insulation materials.

Superior Quality

SUNTHERM products are produced under a strict manufacturing process and rigorous quality control system, ensuring consistent and reliable performance.

Tailored Solutions

SUNTHERM provides personalized and customized services based on your specific needs, offering optimal solutions for various application scenarios.

OEM Support

SUNTHERM offers comprehensive OEM services, helping you build your brand with confidence.

Fast & Reliable Delivery

Thanks to SUNTHERM large-scale and stable production capabilities, we ensure fast turnaround and on-time delivery for every order.

Competitive Pricing

Through years of dedication to international trade and supply chain optimization, we're able to offer the most competitive prices without compromising on quality.

 

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FAQ

Q1: What is your minimum order quantity (MOQ)?

A1: We have no strict MOQ, and orders of any size are welcome. Pricing varies according to the order quantity.

 

Q2: What payment terms do you offer?

A2: We typically require a 30%–50% T/T deposit upon order confirmation, with the balance paid before shipment once the goods are ready. Other payment methods, including L/C, Western Union (for small amounts), and PayPal, are also available.

 

Q3: Can polycrystalline alumina fiber board be in direct contact with flames?

A3: Yes. Polycrystalline alumina fiber board offers excellent high-temperature stability and resistance to flame erosion. It can be used in direct contact with flames and installed on the hot face of high-temperature furnace linings to withstand the impact of flames and high-temperature gas flows. Its main crystalline phases, corundum and mullite, provide outstanding high-temperature stability and erosion resistance.

 

Q4: Can polycrystalline alumina fiber board be used for energy-saving retrofits?

A4: Yes. Polycrystalline alumina fiber board features low heat storage and low thermal conductivity, significantly improving equipment thermal efficiency and greatly reducing energy consumption. It has been successfully used to replace imported products in multiple kilns, delivering excellent energy-saving performance and effectively lowering operating costs.

 

 

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