Polyimide fiber (abbreviated as PI fiber), also known as aramid-imide fiber, is one of the organic polymer fibers with excellent comprehensive performance. Along with carbon fiber and aramid fiber, it is considered one of the three bottleneck high-performance polymer materials restricting the development of China's high-tech industries. Due to its outstanding mechanical strength, electrical insulation properties, and thermal stability, it is widely used in aerospace, military, automotive industry, electronics/electrical, and textile apparel fields.

-Outstanding Functional Characteristics-

1. High and Low Temperature Resistance:

The molecular chain of polyimide fiber exhibits excellent cross-linking, forming a tight structure that effectively blocks heat transfer. It has outstanding high and low temperature resistance, capable of long-term use in temperatures ranging from -200°C to 400°C without becoming brittle or experiencing significant performance degradation.

2. Flame Retardancy:

Polyimide fiber is self-extinguishing, meaning flames quickly die out once the ignition source is removed, and it is difficult to reignite. It has a high limiting oxygen index, indicating it can only be ignited at high oxygen concentrations, thus offering excellent flame retardancy.

3. Radiation Resistance:

After exposure to high-energy radiation (such as ultraviolet light, electron beams, etc.), polyimide fiber maintains stable performance. This property gives it a unique advantage in fields requiring radiation resistance, such as the nuclear energy industry and space environments.

4. High Insulation Performance:

Polyimide fiber has excellent electrical insulation properties, with a low and stable dielectric constant over a wide range. This makes it highly valuable as an insulating material in electrical equipment, wires, and cables.

5. Corrosion Resistance:

Polyimide fiber exhibits excellent resistance to various chemical reagents, such as acids, alkalis, and organic solvents.

6. High Strength and High Modulus:

Polyimide fiber is characterized by high strength and high modulus, with a maximum strength of 5.8–6.3 GPa and a maximum modulus of 280–340 GPa. This makes it an ideal choice for manufacturing high-strength, high-modulus composite materials.

7. Good Spinnability and Dimensional Stability:

Polyimide fiber has good spinnability, allowing it to be easily spun into various specifications of fiber products. At the same time, it exhibits excellent dimensional stability, resisting changes in size due to variations in temperature, humidity, and other external conditions.

8. Low Water Absorption and Unique Cross-Sectional Structure:

Polyimide fiber has low water absorption, enabling it to maintain good performance even in humid environments. Its unique cross-sectional structure gives the fiber excellent performance in filtration materials, particularly in high-temperature flue gas filtration, where it holds an absolute advantage.

-Wide Range of Applications-

1. Aerospace Field:

Used in manufacturing aerospace devices, structural systems for aircraft wings, seals, and fuel pipes. Due to its high strength, low density, and aging resistance, polyimide fiber meets the high demands of the aerospace industry for materials.

2. Special Equipment Field:

Used in manufacturing special equipment packaging materials, bulletproof vests, explosion-proof suits, and protective clothing, significantly enhancing survival and operational effectiveness on the battlefield. It is also used in key components of special aircraft and tanks to improve the performance and reliability of such equipment.

3. Electronics Industry:

Used in manufacturing electronic components, IC packaging materials, and machine housings. Due to its advantages such as electro-thermal stability, temperature resistance, and low thermal expansion coefficient, it effectively extends the service life and reliability of electronic products.

4. Special Protection Field:

Used in manufacturing protective gear for harsh conditions such as high temperatures and strong radiation, including flame-retardant clothing, thermal insulation felts, flight suits, high-voltage shielding suits, and high-temperature-resistant special braided cables. These products protect personnel from extreme environments, improving operational safety and efficiency.

5. Textile and Apparel Field:

Can be made into special workwear, outdoor cold-weather clothing, thermal insulation wadding, and fleece garments, offering excellent warmth and comfort. Additionally, polyimide fiber is used in sportswear such as ski suits and mountaineering gear, meeting the needs of athletes in extreme environments.

6. Automotive Manufacturing Field:

Used in vehicle body structural materials, interior decoration materials, and engine covers. The use of polyimide fiber can reduce the overall weight of vehicles, improving stability and protective performance.

7. High-Temperature Filtration Field:

Used as filter media in baghouse dust collectors for exhaust gas treatment in cement production, thermal power generation, metal smelting, and waste incineration. These industries often produce high-temperature, corrosive exhaust gases, requiring high-performance filter media. The high-temperature and corrosion resistance of polyimide fiber make it an ideal choice for these applications.

8. Other Fields:

Also widely used in nuclear energy, space environments, new construction, high-speed transportation, marine development, environmental protection, sports equipment, and new energy fields.