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- POLYCRYSTALLINE ALUMINA FIBER |
- Polycrystalline Alumina Fiber paper
Polycrystalline Alumina Fiber paper
Polycrystalline Alumina Fiber Paper is a high-performance, thin-sheet insulation material made from high-purity alumina (Al?O?) fibers using a precise wet-forming process. With thicknesses typically ranging from 0.1 mm to 3 mm, this flexible yet durable material provides outstanding thermal insulation, excellent chemical resistance, and superior workability. It is widely used in demanding high-temperature environments where space, precision, and performance are critical.
Technical Data
|
Property |
72-F |
72-M |
85 |
95-M |
95-N |
|
Chemical Composition |
72-75:25-28 |
72-75:25-28 |
85-88:12-15 |
>95:<5 |
>95:<5 |
|
Mineral Structure |
δ/γ-Al?O? or γ-Al?O? |
Mullite |
Mullite + α-Al?O? |
γ-Al?O? |
α-Al?O? |
|
Classification Temp (°C) |
1600 |
1600 |
1800 |
1600 |
1800 |
|
Melting Point (°C) |
>1800 |
>1800 |
>1800 |
>2000 |
>2000 |
|
Density (g/cm³) |
3.1 |
3.1 |
3.2 |
2.8 |
3.4 |
|
Average Fiber Diameter (μm) |
5.5-7.5 |
5.5-7.5 |
4-7 |
3-4 |
3-4 |
|
Impurities (%) |
<0.5 |
<0.5 |
<0.5 |
<0.5 |
<0.5 |
|
Shot Content (≥45μm, %) |
0-2 |
0-2 |
0-2 |
0-2 |
0-2 |
|
Monofilament Tensile Strength (MPa) |
≥1200 |
≥1000 |
- |
- |
- |
|
Monofilament Tensile Modulus (GPa) |
≥100 |
≥100 |
- |
- |
- |
Key Features
High-Temperature Resistance
Designed to operate continuously between 1000°C and 1600°C, the paper can also tolerate short-term exposure to even higher temperatures. Ideal for use in open flames, radiant heat zones, and confined thermal systems.
Superior Thermal Insulation
The interwoven fiber matrix creates a highly porous structure, resulting in low thermal conductivity of approximately 0.03–0.1 W/(m·K) at room temperature. This structure minimizes heat transfer and enhances energy efficiency in industrial systems.
Flexible and Easy to Process
Despite its thermal durability, the paper remains lightweight, soft, and bendable, making it easy to cut, punch, or laminate into complex geometries. It fits snugly into small or irregular spaces, making it perfect for precision applications.
Excellent Chemical and Oxidation Resistance
With strong resistance to acids, alkalis, oxidation, and high-temperature gases, the fiber paper maintains integrity and insulation performance in harsh operating environments involving molten metals, chemical vapors, or exhaust gases.
Low Thermal Mass and Minimal Outgassing
Its low density and non-volatile composition ensure rapid thermal response and minimal contamination, making it suitable for sensitive equipment or cleanroom-related thermal insulation.
Applications
Electronic and Sensor Insulation
Serves as thermal barriers or padding for high-temperature sensors, circuit boards, and heating elements, where precision and protection from heat damage are crucial.
Aerospace and High-Temperature Engine Wrapping
Used as insulating wraps for aerospace propulsion systems, jet engine components, and exhaust ducts, providing high-performance thermal shielding in compact spaces.
Advanced Ceramic Sintering
Functions as gaskets, crucible liners, or interleaves during the sintering of precision ceramics to protect against heat and contamination.
Automotive Emission Control Systems
Integrated into exhaust treatment modules, catalytic converters, and insulation layers, offering consistent heat resistance in fluctuating temperature environments.
