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Polycrystalline Alumina Fiber Products 1600–1700°C

-- Steady & Reliable Manufacturer --

Introduction

Polycrystalline alumina fiber (PAF) represents the highest tier of commercially available refractory fiber insulation, with Al₂O₃ content typically exceeding 95 % and a continuous-service rating of 1600–1700 °C. The fiber microstructure consists primarily of α-alumina and δ-alumina crystalline phases, making it exceptionally resistant to creep, grain growth, and chemical attack at temperatures that cause silica-containing fibers to melt or devitrify.

Production of PAF is technically demanding — the core manufacturing technology was historically confined to a few companies in Japan, the UK, and Germany. Nengcheng has developed its own sol-gel synthesis and high-temperature calcination process to achieve consistent fiber quality, bringing high-performance alumina fiber to a broader industrial market without the import costs previously associated with this material.

Products derived from PAF include loose wool, needle-punched blankets, boards, and alumina fiber cloth. Each form serves a distinct engineering need: wool for irregular cavity packing, blanket for large-area furnace linings, and cloth for flexible thermal wrapping of metallic components.

Specification

ParameterValue
Classification Temperature1600 °C – 1700 °C
Al₂O₃ Content≥ 95%
SiO₂ Content≤ 5% (or near zero for pure alumina grades)
Crystal Phaseα-Al₂O₃ / δ-Al₂O₃
Bulk Density (wool)100–200 kg/m³
Fiber Diameter3–5 µm (typical)
Thermal Conductivity @ 1200 °C≤ 0.30 W/(m·K)
Permanent Linear Change @ 1600 °C / 24 h≤ 3%
Tensile Strength (blanket)≥ 50 kPa
Available FormsWool, needle-punched blanket, board, woven cloth, yarn
ColorWhite

Application

  • Aerospace thermal protection: thermal barrier tiles, engine nacelle insulation, and rocket test stand linings requiring 1600 °C+ stability
  • Military & defense research: protective insulation for high-temperature ballistic test equipment and pyrotechnic research chambers
  • Automotive catalyst sealing: PAF needle-punched blankets as mat seals in automotive three-way catalytic converters (replacing imported Japanese and US products)
  • Rare-earth & advanced ceramics sintering: furnace linings for sintering alumina, zirconia, and silicon carbide ceramics at 1600–1700 °C
  • Petrochemical reforming reactors: radiant-section insulation where process temperatures regularly exceed 1500 °C
  • Glass fiber production: insulation wrap on high-temperature forehearths and feeder channels in E-glass and specialty glass production
  • Research & university labs: as furnace chamber insulation in experimental sintering and calcination equipment

Advantage

  • 1700 °C ceiling: the highest operating temperature among commercially available fibrous insulation materials, enabling next-generation process temperatures
  • Near-zero silica content: eliminates the viscous-phase formation that degrades silica-containing fibers above 1500 °C, ensuring long-term structural integrity
  • Superior creep resistance: α-Al₂O₃ crystal lattice resists deformation under sustained compressive load at high temperature
  • Breaks import dependency: Nengcheng's domestic production provides a cost-effective alternative to imported Japanese and European PAF with comparable technical performance
  • Flexible product forms: same alumina fiber chemistry available as wool, blanket, board, and woven cloth for maximum design flexibility
  • Low contamination risk: high-purity alumina fiber does not introduce unwanted silica or alkali contamination into sensitive sintering atmospheres

Core Features

  • ≥ 95% Al₂O₃ purity verified by XRF analysis on each production batch
  • Sol-gel colloidal process ensuring fiber-level chemical homogeneity
  • High-temperature calcination kiln controlling crystal phase ratio (α vs δ alumina)
  • Needle-punching line for blanket manufacturing without organic binder reliance
  • Weaving capability for alumina yarn and woven cloth (plain, twill, and satin weave)
  • Available in short-fiber wool for vacuum-cast shapes and long-fiber blanket for lining systems
  • What is the difference between polycrystalline alumina fiber and polycrystalline mullite fiber?
  • Both are polycrystalline refractory fibers, but PAF contains ≥ 95% Al₂O₃ with minimal SiO₂, while PMF is a mullite compound at roughly 72% Al₂O₃ and 28% SiO₂. PAF has a higher service ceiling (1700 °C vs 1600 °C), better creep resistance, and is less susceptible to silica-phase breakdown, but it is also more expensive. PMF is often preferred where 1600 °C suffices and cost is a factor.
  • Can polycrystalline alumina fiber be used in reducing atmospheres?
  • Yes, high-alumina PAF is stable in reducing atmospheres up to its rated temperature. Unlike some refractory materials, α-Al₂O₃ does not get reduced or react with carbon monoxide or hydrogen under normal industrial furnace conditions. It is, however, susceptible to alkali vapor attack at very high temperatures — a point worth confirming with your process chemistry.
  • Is alumina fiber cloth suitable for wrapping metal components in heat treatment?
  • Alumina fiber cloth is widely used to wrap or shield metal parts in heat-treatment furnaces, protecting them from direct flame impingement and controlling heating uniformity. The woven structure provides flexibility for conforming to complex component geometries while withstanding the process temperature.
  • How does Nengcheng's alumina fiber compare to imported Japanese products in terms of temperature rating?
  • Nengcheng's PAF products are engineered to match the 1600–1700 °C classification temperature of leading Japanese products (e.g., Mitsubishi Maftec, IBIDEN ALF). Independent thermal shrinkage and creep testing data are available on request to facilitate direct comparison.
  • What packaging is available for PAF blanket for international shipping?
  • PAF blankets are vacuum-compressed and heat-sealed in polyethylene bags, then palletized in plywood crates for sea freight. Compression reduces volume to approximately 30% of installed volume, significantly reducing shipping costs for international buyers.
Zhejiang Nengcheng Crystal Fiber Co., Ltd.
Zhejiang Nengcheng Crystal Fiber Co., Ltd.
Zhejiang Nengcheng Crystal Fiber Co., Ltd. was established in 2015. It is a professional enterprise that develops and produces ultra lightweight energy-saving high-temperature materials, and sells experimental electric furnaces, industrial electric furnaces, and non-standard customized electric furnaces. China Polycrystalline Alumina Fiber Products 1600–1700°C Manufacturers. The company adheres to the principle of "survival through quality, development through reputation" and upholds the business philosophy of "practicality, integrity, and efficiency". We are committed to providing comprehensive and high-quality equipment solutions for customers in industries such as ceramics, metallurgy, electronics, glass, and chemical engineering. We also provide services such as powder roasting, ceramic sintering, and high-temperature experiments to universities, research institutes, and industrial and mining enterprises. wholesale Polycrystalline Alumina Fiber Products 1600–1700°C Suppliers. At the same time, we are also striving to promote the strategic development of Nengcheng's lightweight, energy-saving, and environmentally friendly high-temperature alumina fiber in the field of new furnaces, and strive to become an internationally leading advanced high-temperature equipment industry service provider.

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