Polyimide fleece fabric is used for lightweight down jackets and outdoor sportswear.

Polyimide fleece fabric is first created by weaving polyimide fibers into a fabric, which is then treated to produce a dense, soft, and luxuriant pile on the fabric surface. This pile not only enhances the fabric’s tactile comfort but also forms numerous layers of still air trapped between the fibers, significantly improving the product’s thermal insulation and warmth retention properties.

Characteristics of polyimide fleece fabric:

1. Excellent thermal stability

Polyimide fleece fabric exhibits excellent thermal stability, capable of withstanding temperatures above 280℃ while maintaining structural integrity and performance stability even in extreme temperature environments.

Polyimide fleece fabric also exhibits excellent resistance to long-term thermal aging. Compared with common heat-resistant fibers such as aramid and phenolic fiber, polyimide fleece fabric has a significantly longer service life under sustained high-temperature conditions. In applications such as high-temperature product conveyance in aluminum profile processing and dyeing industries, as well as thermal insulation for aging furnaces, tubular, annular, and belt-shaped felts made from polyimide fleece fabric have become the preferred insulation material solution.

2. Excellent thermal insulation performance

The structure of polyimide fleece fabric inherently contains a large number of stationary air layers. Combined with the polyimide material’s naturally low thermal conductivity, this creates an exceptionally effective thermal insulation barrier. On the one hand, polyimide fibers themselves have low thermal conductivity, making them one of the best insulating and heat-retaining materials; on the other hand, the stationary air layers formed by the fleece structure further inhibit heat loss.

In terms of thermal insulation mechanisms, polyimide fleece not only reduces heat conduction through physical barrier effects but also enhances its insulating performance by inhibiting thermal radiation and convection. Compared to traditional insulation materials such as down and cotton, polyimide fleece maintains excellent thermal performance even in humid environments and does not significantly degrade its insulating effectiveness due to moisture absorption.

3. Inherent Flame Retardancy and Fire Safety

Polyimide fleece fabric possesses inherent flame-retardant properties and exhibits excellent fire safety without the need for any post-treatment flame-retardant finishing. The limiting oxygen index (LOI) of polyimide fibers can reach as high as 44, meaning that polyimide materials will only sustain combustion in an environment where the oxygen concentration reaches 44%. Since the oxygen concentration in the atmosphere is only 21%, polyimide fleece fabric is actually difficult to ignite in air. Even when directly exposed to an open flame, it features self-extinguishing properties—once removed from the flame source, the burning will automatically stop. Moreover, polyimide fleece fabric does not produce molten droplets at high temperatures, thereby effectively preventing secondary injuries to personnel.

4. Excellent chemical stability and corrosion resistance

Polyimide fleece fabric exhibits exceptional chemical stability and is resistant to the corrosion of a wide variety of chemicals. Take the high-temperature filtration field as an example: high-temperature filter felts made from polyimide fleece can operate reliably and stably for extended periods in corrosive flue gas environments found in industries such as cement, steel, power generation, and waste incineration. These environments often contain corrosive gases like sulfur dioxide and nitrogen oxides; however, polyimide fleece demonstrates outstanding stability even in alkaline environments and against organic solvents.

5. Comfort and Biocompatibility

Polyimide fibers exhibit excellent skin compatibility and do not cause allergic or irritant reactions. This characteristic allows polyimide brushed fabrics to be used directly in contact with the skin, making them ideal for producing close-fitting garments such as underwear and thermal wear. In practical applications, polyimide thermal underwear is only one-third the thickness of conventional wool underwear yet offers 40% better warmth. Worn next to the skin, it feels lightweight and unrestrictive. Part of this comfort stems from the hypoallergenic nature of polyimide fibers and their superior moisture-management capabilities, which help keep the skin dry and comfortable.

The comfort of polyimide brushed fabric is further enhanced by its soft hand feel and excellent drape. The brushing process creates a pile on the fabric surface, giving it a velvety soft texture that significantly improves wearing comfort.

In addition, the biocompatibility of polyimide fibers also gives them potential applications in medical and healthcare products, such as medical protective garments, casual wear designed to eliminate unpleasant body odors, specialized clothing for protection against biochemical weapons, medical hygiene protective apparel, and high-efficiency smoke-protection masks.

Applications of polyimide fleece fabric:

1. Consumer goods sector

In the apparel and textile industry, polyimide fleece fabrics are primarily used to produce high-end functional garments, such as ultra-thin thermal underwear, lightweight down jackets, and outdoor sportswear. Outdoor garments made from polyimide fleece fabrics have a tear strength three times greater than that of conventional nylon fabrics, and they remain flexible even in low-temperature environments.

2. Specialized Protection Field

Polyimide fleece fabric boasts multiple protective features, including high-temperature resistance, flame retardancy, and thermal insulation. It is used to manufacture fire-fighting protective suits for firefighters, forest fire-fighting protective suits, pressure-resistant suits for pilots, firefighting gear for ships, work uniforms for furnace operators, as well as various protective headgear and flame-retardant undergarments. These protective garments offer superior performance and enhanced weather resistance compared to conventional products, providing more comprehensive protection for special-duty personnel such as firefighters, armed police forest fire fighters, professional forest firefighters, pilots, ship damage control crews, and furnace operators. In particular, when used in fire-fighting suits, polyimide fleece fabric distinguishes itself from current fire-fighting garments by its overall flame-retardant properties and non-dripping characteristics—under extreme high-temperature conditions, it neither melts nor drips, thereby effectively preventing secondary injuries.

3. Emerging Fields

In the field of safety protection, polyimide fleece fabric can be used to manufacture specialized garments designed to protect against biochemical weapons. In the electronics industry, polyimide fibers are employed in battery separators. In the construction sector, polyimide tarpaulins boast durability, flame retardancy, and antibacterial properties; compared to traditional cotton tarpaulins, they are lighter and easier to store. Polyimide fleece fabric will also gradually find new applications in areas such as home textiles (with antibacterial and anti-mite properties) and food packaging (featuring high-temperature resistance and microwave-safe capabilities).

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