Polycrystalline Alumina Fiber Board

Product Description：

Polycrystalline alumina fiberboard is a high-performance ceramic fiber product made from high-purity polycrystalline alumina fibers as the main raw material, through a wet forming and high-temperature sintering process. The product's interior is composed of a uniformly interwoven network of polycrystalline fibers, resulting in a dense structure and smooth surface. It combines the high-temperature resistance of ceramic materials with the excellent thermal insulation properties of fiber materials.

In terms of temperature resistance, polycrystalline alumina fiberboard can withstand long-term operating temperatures up to 1450℃, and its short-term temperature resistance is even superior, far exceeding that of ordinary aluminosilicate fiber materials. Its fine fiber grains and pure grain boundaries ensure structural stability at high temperatures, preventing grain coarsening or phase transformation, and maintaining reliable physical and chemical stability under ultra-high temperature conditions.

Thermal insulation performance is one of the core advantages of this product. The microporous structure formed by the polycrystalline fibers effectively suppresses heat conduction and convection, giving the material extremely low thermal conductivity and heat capacity. Compared to traditional refractory bricks or castables, this board can significantly reduce kiln heat storage losses and furnace wall heat dissipation, achieving energy saving and consumption reduction while supporting faster heating and cooling rates to meet the demands of high-efficiency production. In terms of chemical purity, the product primarily consists of α-alumina, with an alumina content typically not less than 95%. Impurities are extremely low, and the slag ball rate is strictly controlled. This characteristic ensures that it produces virtually no volatiles or precipitates during high-temperature use, causing no pollution to the furnace atmosphere. It is particularly suitable for processes requiring high cleanliness, such as the sintering of precision electronic components, heat treatment of special ceramics, and calcination of lithium-ion battery cathode and anode materials.

Regarding mechanical properties, after high-temperature sintering, the sheet material retains the flexibility of the fiber material while possessing good compressive strength, flexural strength, and thermal shock resistance. It is not prone to slag shedding or cracking during installation and use, and can withstand a certain degree of mechanical vibration and airflow erosion. The product is molded, ensuring high dimensional accuracy and uniform thickness. It can be cut, drilled, and grooved according to customer requirements, making on-site installation convenient and efficient.

Polycrystalline alumina fiberboard is widely used in ceramic sintering furnaces, pusher kilns, roller kilns, semiconductor diffusion furnaces, high-temperature vacuum furnaces, petrochemical cracking furnaces, high-temperature alloy smelting furnaces, and aerospace thermal protection systems. It can be used as a working lining that is in direct contact with flames or high-temperature atmospheres, or as a backing insulation layer. It is an ideal energy-saving refractory material for ultra-high temperature industrial fields.

 

Product Features:

Ultra-high temperature resistance: Long-term operating temperature up to 1450℃, with even higher short-term temperature resistance, suitable for ultra-high temperature conditions.

Low thermal conductivity and energy saving: The polycrystalline fiber microporous structure effectively inhibits heat conduction, resulting in low thermal conductivity, minimal heat loss, and significant energy savings.

High chemical purity: Al₂O₃ content ≥95%, extremely low impurity and slag content, no volatile matter precipitation at high temperatures, and no pollution to the furnace atmosphere.

Excellent thermal stability: Good thermal shock resistance, stable structure at high temperatures, and less prone to grain coarsening or phase transformation.

Good mechanical strength: High-temperature sintering, high compressive and flexural strength, not easily broken or slag-shedding, ensuring high reliability in installation and use.

High dimensional accuracy: Mold-formed, smooth surface, uniform thickness, easy to cut, drill, and process irregular shapes, and convenient installation.

Corrosion resistance: Except for hydrofluoric acid and strong alkalis, it has good resistance to most acid and alkali media and reducing atmospheres.

Low heat capacity: Low heat capacity, supports rapid heating and cooling, helping to 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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Packaging Display
SUNTHERM has a professional team with rich experience in customizing packaging for various products.

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FAQ

Q1: What is your MOQ?

A1: We don't have a strict MOQ-orders of any size are welcome. Pricing is quantity-based.

Q2: What payment terms do you usually adopt?

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 such as L/C, Western Union (for small amounts), and PayPal are also available.

Q3: Does your company accept customization?

A3: Yes, we offer OEM services backed by our own factory and a skilled technical team.

Q4: What is your typical production lead time?

A4: Lead time varies by product and order quantity, generally ranging from 7 to 15 days after order confirmation and deposit receipt. We'll provide a confirmed timeline once we know your specific requirements.

Q5: Can you provide samples? What are the sample policies?

A5: Yes, samples are available for quality evaluation. Sample fees and shipping costs are typically borne by the customer but can be refunded upon placement of a formal order.

Q6: How do you ensure product quality and packaging for export?

A6: We maintain strict quality control throughout the production process. For export, goods are securely packaged using standard export cartons, wooden cases, or pallets as needed to ensure safe transport.

 

 

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