Polyimide nonwoven fabric composite aramid filament fabric used as the thermal insulation layer in specialized industrial workwear.

The polyimide nonwoven fabric composite aramid filament cloth is made by combining polyimide felt with aramid filament cloth. The polyimide felt is produced through a needle-punching process using short fibers, resulting in a three-dimensional, porous, and fluffy structure. This inherent structure endows it with excellent thermal insulation, sound absorption and cushioning properties, as well as highly efficient filtration performance. At the same time, its soft texture allows it to conform well to irregular surfaces. The aramid filament cloth is woven from high-strength aramid filaments arranged in both warp and weft directions; it is a dense, smooth, and high-strength woven fabric that offers exceptionally high tensile strength, tear resistance, abrasion resistance, and dimensional stability.

Characteristics of polyimide nonwoven fabric composite aramid filament cloth:

1. Enhanced structural stability and durability

Aramid filament fabric provides a robust skeleton for the entire composite material, overcoming the drawbacks of pure nonwoven felt—such as its relatively low mechanical strength, tendency to deform, and susceptibility to fiber shedding from the surface. The resulting composite material exhibits greater dimensional stability, improved resistance to friction and delamination, and is easier to process and sew.

2. Balanced Performance

Lightweight, thermally insulating, and high-strength: Polyimide felt offers a very low thermal conductivity and excellent high-temperature resistance, while aramid fabric bears the mechanical load. As a result, when achieving the same level of thermal insulation performance, this material is thinner, lighter, and stronger than conventional insulation materials.

High flexibility and puncture resistance: The felt provides the overall material with excellent flexibility and compressive resilience, while the outer layer of aramid fabric effectively resists punctures or cuts from sharp objects, expanding its applicability in complex environments.

3. Chemical resistance and weather resistance

It exhibits excellent resistance to common acids, bases, salts, and organic solvents, and is also resistant to ultraviolet radiation and radiation exposure, making it suitable for complex and harsh chemical and outdoor environments.

4. Flame Retardancy and Thermal Insulation

Both fabrics are inherently flame-retardant materials. After compounding, they exhibit a very high limiting oxygen index (LOI): aramid fiber has an LOI of 29, while polyimide fiber can reach as high as 44. When exposed to fire, these materials do not melt or drip; they self-extinguish immediately upon removal from the flame and can form a stable, insulating carbon layer. Even after direct flame exposure, the composite material retains excellent mechanical performance.

Application fields of polyimide nonwoven fabric composite aramid filament cloth:

1. High-temperature industrial insulation and sealing

The fabric is easy to secure and install, and can withstand scratches from on-site environmental conditions, forming a robust and durable “thermal insulation blanket” or “sealing gasket” for thermal insulation covering of high-temperature pipelines, valves, and kilns in the steel, power, and chemical industries; as well as fire-resistant partitions in aerospace engine compartments.

2. High-end protective clothing

It adopts a sandwich structure consisting of "aramid fabric (outer layer) / polyimide felt (intermediate thermal insulation layer) / comfortable lining." The aramid fabric provides basic flame retardancy and abrasion resistance; the polyimide felt in the middle, when exposed to extremely high heat sources, forms a robust carbonized thermal barrier that effectively slows down heat transfer and protects the wearer. This material is used as the thermal insulation layer in fire-fighting suits, arc-flash protective garments, and specialized industrial workwear.

3. Transportation and Aerospace

Composite structures integrate multiple requirements—such as thermal insulation, fire resistance, weight reduction, noise reduction, and structural reinforcement—into a single material, meeting the modern transportation industry’s demands for multifunctional and lightweight materials. These structures are used in fire- and soundproof interior panels for high-speed trains and aircraft, as well as in thermal-insulation and fire-resistant covers for battery packs in new-energy vehicles.

4. High-performance high-temperature filtration

The dense surface of aramid fabric or coated membranes enables surface filtration, capturing most of the coarse particles. The fluffy polyimide felt in the inner layer provides deep filtration, trapping fine particles. At the same time, the felt’s structure ensures low resistance and high dust-holding capacity, as well as improved ash-cleaning performance. This spun filter material is used for dust removal from high-temperature flue gases generated by waste incineration, coal-fired boilers, cement kiln exhausts, and similar sources.

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