High-Purity Alumina Fiber Cloth

Product Description:

High-Purity Alumina Fiber Cloth represents a breakthrough in high-temperature textile engineering, produced from 99.5% pure polycrystalline α-Al₂O₃ continuous filaments via a proprietary sol-gel spinning and sintering process. The resulting fiber structure is then precision-woven into a flexible, drapable cloth that combines the refractoriness of rigid ceramic with the handling convenience of conventional textiles.

 

High-Purity Alumina Fiber Cloth maintains its dimensional stability and load-bearing capacity up to a maximum service temperature of 1100°C. Its exceptionally low thermal diffusivity and minimal heat retention dramatically reduce thermal losses, enabling faster thermal cycling and lower fuel consumption in batch and continuous processes. Unlike conventional silica or glass-based fabrics, High-Purity Alumina Fiber Cloth resists devitrification and embrittlement over extended dwell times, ensuring long service life in both static and dynamic sealing applications.

 

High-Purity Alumina Fiber Cloth exhibits extraordinary resistance to molten metal splash, acid gases, and alkali vapors, while remaining completely stable in oxidizing, reducing, and vacuum atmospheres. Its balanced weave construction delivers high tear strength and abrasion resistance, yet the material remains pliable enough for contour wrapping around pipes, expansion joints, and burner assemblies.

 

Furthermore, the fabric's low bio-persistence and absence of organic binders make it a safer choice for operators and compliant with modern industrial hygiene standards.

 

Product Features:

● Outstanding high-temperature resistance: a maximum tolerance of 1100 ℃

● Strong chemical corrosion resistance

● Excellent electrical insulation and aging resistance

● Superior thermal insulation performance

● Low smoke, non-toxic, and excellent flame-retardant properties

 

Product Applications:

◆ Outer wrapping of high-temperature pipes for thermal protection

◆ Kiln internal linings, suitable for high-temperature working environments

◆ High-temperature gas filtration in chemical and heavy industries

◆ Production of flame-retardant fire curtains to enhance fire safety

◆ Manufacturing of high-temperature-resistant protective clothing for personnel safety under special working conditions

 

Product Technical Parameters:

No.	Test Item		Technical Requirement
1	Appearance		Flat surface, free of loose threads
2	Density (counts/10cm)	Warp direction	58±4
		Weft direction	29±2
3	Area Weight (g/m²)		1000±100
4	Thickness (mm)		2+0.5
5	Breaking Strength (N/10cm)	Warp direction	1496
		Weft direction	1055
6	Elongation at Break (%)	Warp direction	10.8
		Weft direction	6.12
7	Breaking Strength Retention after 600°C/24h (%)	Warp direction	27.9
		Warp direction	18.7
8	Loss on Ignition (%)		10.3
9	Moisture Content (%)		1

 

Sol-Gel Processing Fundamentals for High-Performance Polycrystalline Alumina Fiber Production

The sol-gel technique serves as the cornerstone for manufacturing high-purity polycrystalline alumina fibers, offering exceptional compositional homogeneity and controlled microstructural evolution. This wet-chemical route typically employs precursors such as soluble aluminum salts (e.g., crystalline aluminum chloride), metallic aluminum powder, and colloidal silica as the primary feedstock. Through sequential hydrolysis and condensation reactions, a precursor sol with tailored rheological behavior is developed. The underlying reaction pathway involves the formation of Al–OH species from aluminum precursor hydrolysis, followed by polycondensation that generates an Al–O–Al inorganic polymer network, eventually yielding a spinable sol system with the required consistency for fiber drawing.

The flow characteristics of the sol are decisive in dictating the drawability and final fiber morphology. Viscosity, in particular, has been identified as a critical control parameter that directly influences both filament diameter and resulting tensile performance. Experimental findings demonstrate that at a colloidal viscosity of 30 Pa·s, fibers with an average filament diameter of approximately 3.7 μm can be consistently produced, accompanied by favorable mechanical strength. Additionally, polyethylene glycol (PEG) is incorporated as a spinning auxiliary to enhance spinnability and maintain jet stability. The concentration of PEG plays a pivotal role in determining fiber formation quality, with optimal results achieved at a mass fraction of roughly 4%, beyond which phase separation or structural defects may arise.

 

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FAQ

Q1: Do you offer free samples?

A1: Yes, we provide free samples upon request.

 

Q2: What is your minimum order quantity (MOQ)?

A2: We do not have a strict MOQ. Orders of all sizes are welcome to accommodate various project requirements, with pricing adjusted accordingly based on the order volume.

 

Q3: Are you a manufacturer or a trading company?

A3: We are a direct manufacturer established in 1993 and based in Shandong, China. As a factory-direct supplier, we are able to guarantee high-quality products and competitive pricing, supported by comprehensive pre-sales and after-sales service.

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