High-Temperature Polycrystalline Alumina Fiber Bulk

Product Description：

SUNTHERM High-Temperature Polycrystalline Alumina Fiber Bulk is primarily composed of alumina and silica and are manufactured using the internationally advanced "sol-gel" process. Their overall performance indicators are at a leading international level, offering outstanding flexibility as well as excellent refractory and thermal insulation properties.

High-Temperature Polycrystalline Alumina Fiber Bulk features a uniform fiber diameter and a maximum continuous service temperature of up to 1600 °C.

High-Temperature Polycrystalline Alumina Fiber Bulk offers unparalleled advantages, including excellent thermal stability, high mechanical strength, large elastic modulus, low thermal conductivity, strong insulation properties, and high resistance to chemical corrosion. Fiber products (such as fiber blankets, felts, papers, boards, modules, and special-shaped parts) have low density and heat capacity, minimal thermal conductivity, and excellent thermal shock resistance.

According to differences in alumina content and crystalline phase, our product models are classified into: AL72-F, AL72-M, AL95-M, and AL95-N.

Product Features:

Outstanding high-temperature resistance:

Continuous service temperature up to 1600 °C; after exposure to liquid nitrogen (–196 °C) for 24 hours, no strength degradation is observed.

Excellent acid resistance:

Demonstrates strong resistance to most chemical substances, except hydrofluoric acid, phosphoric acid, and strong alkalis.

Shot-free fibers (≥ 45 μm):

Lower shot content ensures superior thermal insulation and refractory performance.

Excellent electrical and insulation properties:

Above 600 °C, electrical resistance remains essentially stable. Polycrystalline alumina fibers have a low dielectric constant, making them suitable for high-frequency wave-transmission applications.

Superior flexibility:

AL72-F grade fibers are not prone to breakage during needling, making them highly suitable for needle-punched products.

High design flexibility:

Different performance characteristics can be achieved through precise control of chemical composition and heat-treatment processes.

Product Applications:

Raw material for fiber products (blankets, felts, papers, boards, and custom-shaped parts)

Catalyst carrier materials

High-temperature filtration media

Reinforcement for metal-matrix, ceramic-matrix, and resin-matrix composites

Three-way catalytic converter support mats

Thermal insulation materials for the automotive industry

High-temperature furnace insulation and filling materials

Product Technical Parameters:

Item	AL72- F	AL72- M	AL95- M	AL95- N
Chemical Composition Al₂O₃, SiO₂ (%)	72-75:25-28	72-75:25-28	>95:<5	>95:<5
Mineral Structure	δ-Al₂O₃ or γ-Al₂O₃	Mullite	γ-Al₂O₃	α-Al₂O₃
Classification Temperature (°C)	1600	1600	1600	1800
Melting Point (°C)	>1800	>1800	>2000	>2000
Density (g/cm³)	3.1	3.1	2.8	3.4
Average Fiber Diameter (μm)	5.5-7.5	5.5-7.5	3-5	3-5
Shot Content (%) (≥45μm)	0-2	0-2	0-2	0-2
Impurity Content (%)	<0.5	<0.5	<0.5	<0.5
Monofilament Tensile Strength (MPa)	≥1200	≥1000	-	-
Monofilament Tensile Modulus (GPa)	≥100	≥100	-	-

Product Certificate 

Why Choose Us

Extensive Experience

With 32 years of manufacturing expertise and 19 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.

Customer visits

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 specific MOQ, we can accept any order for different items. The price depends on the quantity.

Q2: What payment terms do you usually adopt?

A2: Payment terms: T/T 30%-50% deposit after order confirmation, after the goods are ready, pay the balance before shipment, support other payment methods: L/C, or Western Union (small payment) or PAYPAL.

Q3: Does your company accept customization?

A3: We have our own factory and excellent technical team, we accept OEM service.

Q4: What is your typical production lead time?

A4: Lead time varies depending on the product and order quantity. Generally, it takes 7-15 days after order confirmation and deposit receipt. We will provide a precise timeline upon reviewing your specific requirements.

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

A5: Yes, samples are available for quality verification. Sample fees and shipping costs are generally borne by the customer, but can be refunded upon placing a formal order.

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

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

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