SUNTHERM ALWOOL Continuous Alumina Fiber

Product Description:

SUNTHERM ALWOOL alumina continuous fiber is primarily composed of high-purity alumina and silica, produced by the sol–gel method to ensure superior structural integrity and thermal performance. It maintains excellent mechanical properties even under prolonged exposure to high temperatures above 1100 °C.

The fiber can be processed into flexible textile forms such as ropes, yarns, and fabrics, or further engineered into high-performance composite materials. Its versatility, lightweight nature, and outstanding heat resistance make it an essential material for demanding applications in aerospace, advanced manufacturing, and defense industries.

Thanks to its continuous filament structure, the fiber can be easily woven or fabricated into various textile products, including fiber ropes and cloth, as well as integrated into composite systems. Its flexibility in form and processing makes it highly adaptable to complex industrial requirements, particularly in emerging high-tech sectors, aerospace applications, and advanced defense systems.

Based on alumina content, the product is available in the following grades: AL17, AL18, and AL19.

 

Product Features:

Excellent High & Low Temperature Resistance: Service temperature up to 1100°C–1300°C. Strength remains undiminished after 24-hour treatment in liquid nitrogen (-196°C).

Excellent Acid & Alkali Resistance: Superior corrosion resistance, offering excellent resistance to most chemicals (except hydrofluoric acid, phosphoric acid, and strong alkalis).

Excellent Electrical Properties & Insulation: Electrical resistance stabilizes above 1100°C, and the polycrystalline alumina fiber has a low dielectric constant, making it suitable for high-temperature wave-transparent materials.

Excellent Flexibility: At room temperature, alumina continuous fiber can be bent over 1400 times; it can still be bent 60 times after treatment at 1100°C.

High Designability: Products with different properties can be obtained by adjusting chemical composition and heat treatment processes.

 

Product Applications:

Refractory insulation for hot-end components in aerospace

High-temperature filtration, high-temperature filter bags

Radar wave-transparent radomes

Thermocouple wires, fire-resistant insulation for cables and wires

High-temperature furnace linings, thermal insulation sealing rings, high-temperature insulation curtains

High-temperature sintering gaskets

ACCR composite core conductors

Oilstone abrasives

5G Communication field: Mobile phone backplate materials

Composite Materials: Reinforcement material for metal matrix, ceramic matrix, polymer matrix, etc.

 

Product Technical Parameters:

Property	AL17	AL18	AL19
Chemical Composition (wt.%)	72 Al₂O₃ + 28 SiO₂	85 Al₂O₃ + 15 SiO₂	≥99 Al₂O₃
Crystal Phase	γ-Al₂O₃ + Amorphous	α-Al₂O₃ + Mullite	α-Al₂O₃
Melting Point (°C)	1800	1800	2000
Continuous Use Temp. (°C)	≥1200	≥1300	≥1100
Monofilament Diameter	9–12	11–14	11–14
Density (g/cm³)	3.0	3.4	3.9
Tex (g/1000m)	67 / 200	100 / 167	100 / 167
Monofilament Tensile Strength (GPa)	≥2.0	≥2.0	≥3.0
Monofilament Tensile Modulus (GPa)	≥170	≥240	≥330
Dielectric Constant @9.5GHz	3.2	3.8	4.7
Loss Tangent @9.5GHz	0.005	0.005	0.007

 

AL17 Fiber: The fiber features a microcrystalline polycrystalline structure (γ-Al₂O₃ + Amorphous), with a diameter of 9-12μm. Its room-temperature tensile strength can exceed 2.0 GPa, and its long-term service temperature is above 1200°C. It exhibits excellent high-temperature resistance and creep resistance.

AL18 Fiber: The fiber is microcrystalline (α-Al₂O₃ + Mullite), with a diameter of 11-14μm. Its room-temperature tensile strength can exceed 2.0 GPa, and its long-term service temperature is above 1300°C. Currently, it is the alumina fiber with the best creep resistance. Its strength remains essentially unchanged below 1100°C, retains over 90% of room-temperature strength at 1200°C, and retains over 80% at 1300°C.

AL19 Fiber: The fiber is microcrystalline (α-Al₂O₃), with a diameter of 11-14μm. Its room-temperature tensile strength can exceed 3.0 GPa, and its long-term service temperature is above 1100°C. It offers high room-temperature strength and good mechanical properties, making it suitable as a composite reinforcement material, but it has poor high-temperature creep resistance.

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FAQ

Q1: How do you ensure product quality control?

A1: SUNTHERM operates under a comprehensive quality management system that oversees every stage of production-from raw material composition to the final product's physical properties. All items undergo strict testing prior to shipment. We can also provide a quality inspection report along with the delivery upon request.

Q2: Are you a factory or a trading company?

A2: We are a factory. You are welcome to visit our facility anytime-I will personally guide you through our production lines.

Q3: Do you offer free samples?

A3: We do provide free samples; however, shipping fees are to be covered by the customer.

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