Alumina fiber board
Alumina fiberboard is a high‑temperature refractory product in board form, manufactured using high‑purity polycrystalline alumina fiber as the primary raw material and employing either vacuum filtration or a combined vacuum–pressure forming process. As a deeply processed sheet product derived from Al₂O₃–SiO₂ ceramic fibers, it addresses the challenge of meeting the demands for high‑strength support and planar thermal insulation that cannot be satisfied by fiber blankets or felts alone. Depending on the alumina content, the product can operate at temperatures ranging from 1500 to 1700°C—200 to 400°C higher than conventional aluminosilicate fiber. It is widely used as furnace lining insulation in high‑temperature industrial kilns and other thermal equipment across industries such as metallurgy, machinery, electronics, ceramics, chemical engineering, and aerospace, with the aim of achieving energy savings, increased production, extended furnace life, and improved working conditions. The board has a white appearance, a smooth surface, uniform dimensions, and self‑supporting strength, resembling lightweight refractory panels.
Category:
Fiberboard
The company’s products feature numerous technological achievements and innovative, practical technologies. We manufacture polycrystalline mullite fiber fireproof boards, polycrystalline alumina fiber furnace linings, ceramic fiber furnace linings, polycrystalline mullite fiber furnace linings, and crystalline fibers.
E-mail：ncjt@zjncjt.com
Product Description
1. Product Description:
Alumina fiber boards are slab-shaped products developed to meet the needs of planar thermal insulation and structural support in high‑temperature industrial kilns and other thermal processing equipment. They can operate at temperatures as high as 1500–1700°C, which is 200–400°C higher than that of conventional aluminosilicate fiber. These boards are widely used for thermal facing and back‑lining insulation in furnace linings across industries such as metallurgy, chemical engineering, electronics, and aerospace, helping to achieve energy savings and improved efficiency. The products are made from polycrystalline alumina fiber or high‑purity fiber, combined with inorganic binders, and formed via vacuum filtration or mold pressing. Standard dimensions are 1000×600×30–100 mm, though custom sizes can be produced according to drawings. The boards have a white appearance, a smooth surface, uniform bulk density, and self‑supporting strength—much like lightweight refractory slabs.
2. Product Features:
Due to its unique manufacturing process and fiber structure, alumina fiberboard possesses a range of characteristics that significantly outperform traditional heavy-duty refractories as well as ordinary fiber blankets and felts:
Low Thermal Conductivity and High Insulation: Inheriting the low thermal capacity and low thermal conductivity characteristics of fiber materials, it boasts a thermal conductivity as low as 0.15–0.16 W/(m·K) at 1200°C, delivering remarkable insulation performance and excellent energy-saving effects.
Excellent high-temperature stability: The product exhibits low linear shrinkage when heated within its operating temperature range, with a linear shrinkage of ≤0.3% after 24 hours at 1500°C. It also boasts good volumetric stability and can operate stably for extended periods at 1600–1700°C.
Lightweight and High Strength: The product has a bulk density of only 380–500 kg/m³, which is far lower than that of traditional firebricks. At the same time, the vacuum forming process imparts excellent compressive strength and structural rigidity to the product, resulting in a tough and durable texture.
Thermal Shock Resistance and Chemical Stability: The fibrous structure endows the material with excellent thermal shock resistance, allowing it to withstand rapid heating and cooling without cracking. It exhibits good wetting resistance against most molten metals and boasts outstanding corrosion resistance.
Easy to Process and Install: The product can be cut and drilled using standard woodworking tools, making on-site construction and installation convenient. Standardized specifications are available, and custom non‑standard dimensions can also be produced according to drawings.
3. Product Applications
Widely used as thermal insulation and electrical insulating materials for high‑temperature furnace linings, heating devices in instruments and equipment; kiln lining materials for tunnel kilns and roller hearth kilns; thermal facing and back‑up insulation layers for industrial kilns in metallurgy, chemical engineering, glass manufacturing, and other industries; inner linings for specialized high‑temperature equipment such as ceramic sintering furnaces, heat treatment furnaces for magnetic materials, and sapphire growth furnaces; as well as thermal insulation materials for building fire protection and high‑temperature filtration applications.
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E-mail: ncjt@zjncjt.com
Zhejiang Nengcheng Crystal Fiber Co., Ltd
150 meters south of the intersection of Wulin Road and Yonghe West Road, Deqing County, Huzhou City, Zhejiang Province.
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