Polyimide felt is used to make fire-extinguishing blankets, flame-retardant fabrics, and fire-resistant suits.

Polyimide felt, also known as P84 fiber felt, is a high-performance nonwoven material woven from polyimide fibers using a needle-punching process.

Polyimide felt has a natural golden-yellow appearance, which is inherent to its material properties and does not require the addition of any chemical dyes.

Characteristics of polyimide felt:

1. High-temperature resistance

Polyimide felt exhibits excellent long-term thermal stability, allowing it to be used continuously under high-temperature conditions ranging from 260°C to 300°C without significant changes in its mechanical properties. Similarly, at a temperature of 240°C, the mechanical performance of polyimide fiber filter media remains remarkably stable.

2. Flame Retardancy

The oxygen index (LOI) value of polyimide fibers ranges between 32% and 38%. When exposed to flames, these fibers do not melt or drip—they instead char directly. This unique property effectively prevents fire from spreading and minimizes secondary damage. Additionally, the fibers exhibit self-extinguishing characteristics: once removed from the flame source, combustion automatically ceases.

3. Chemical Stability

Polyimide felt exhibits excellent resistance to acids, bases, and oxidizing agents, allowing it to maintain its performance consistently even in chemically corrosive environments over extended periods. Additionally, polyimide fibers are highly resistant to discoloration or degradation under UV exposure, making them ideal for outdoor applications and long-term use.

4. Physical and Mechanical Properties

Polyimide fibers boast exceptional wear resistance, enabling them to maintain both structural integrity and functionality over extended periods of use. Nonwoven felt made from polyimide fibers, when crafted into thermal insulation protective garments, not only offers superior comfort and excellent skin compatibility but also exhibits remarkable dimensional stability, enhanced safety features, and an impressively long service life. With a thermal conductivity of just 0.16 W/m·K, polyimide felt stands out as an outstanding insulating material due to its exceptionally low heat transfer properties.

5. Safety and Environmental Features

Polyimide fibers are biocompatible and harmless to human health, making them suitable for products that come into direct contact with skin. Polyimide fibers offer long-lasting antibacterial properties, effectively inhibiting common harmful bacteria such as Staphylococcus aureus. Additionally, the durability and extended lifespan of polyimide felt help minimize waste generation, aligning perfectly with eco-friendly standards.

Applications of polyimide felt:

1. High-Temperature Industrial Filtration

Heavy industrial applications: Used in flue gas treatment and dust removal systems at ironworks, steel plants, ferroalloy plants, refractory factories, foundries, power plants, and more. It also plays a critical role in purifying high-temperature flue gases generated in production facilities such as asphalt concrete mixing plants, cement plants, ceramic factories, lime kilns, and gypsum manufacturing sites.

In the field of combustion treatment: Used for flue gas filtration in waste incinerators, coal-fired boilers, fluidized bed boilers, and more, effectively removing harmful particulates from flue gases.

Non-ferrous metal smelting: In the filtration of flue gases from aluminum electrolysis, as well as in the smelting processes of lead, tin, zinc, copper, and other rare metals, polyimide felt can withstand harsh chemical environments while delivering highly efficient filtration.

Chemical Industry & Manufacturing: Used for liquid-solid separation and fine material recovery in fields such as chemicals, coke, carbon black, dyes, pharmaceuticals, plastics, and more.

2. Protective Clothing Sector

Specialty protective clothing: Used to create protective suits for armored units, fire-retardant racing suits, flightwear, and other flame-resistant garments. These garments leverage the flame-retardant properties, exceptional resistance to extreme temperatures, and superior thermal insulation of polyimide fibers, providing reliable protection for personnel engaged in specialized operations.

Industrial protective equipment: Flame-retardant workwear designed for insulation, breathability, and flexibility, used in sectors such as metallurgy, hydropower, nuclear industry, geology & mining, petrochemicals, and oilfields.

Civilian protective products: Used to create fire blankets, baby safety blankets, flame-retardant towels for infants and toddlers, as well as pet protection blankets—among other civilian protective items. Made from a golden-yellow brushed fabric crafted by blending fire-resistant acrylic fibers with polyimide, this material offers a soft, comfortable touch, making it the ideal choice for developing flame-retardant and heat-insulating products.

3. Transportation Sector

Rail Transit: Thermal and sound-absorbing materials used in high-speed trains, subways, and other rail vehicles, enhancing both vehicle safety and passenger comfort.

Shipbuilding: Polyimide foam composite felt materials excel in thermal insulation applications for ships and submarines.

Automotive Industry: Filtration processes used in car manufacturing for electrophoretic coatings, pretreatment solutions, topcoats, and more, as well as cooling fluids for engine crankshaft production, whole-vehicle spray water, process gases for painting applications, and air purification systems in paint booths.

4. Other Professional Fields

Electronics and electroplating industries: Gas filtration systems used for purifying and cleaning process gases in applications such as integrated circuits, cathode ray tubes, liquid crystal displays, photoresists, optical discs, and electroplating solutions.

Petroleum and Natural Gas: Applications include the separation and purification of natural gas and refinery products, CNG filtration at refueling stations, amine-based desulfurization and dehydration solvent filtration, as well as water injection and well completion, workover operations, and acidizing fluid filtration in oilfields.

Biological Engineering and Pharmaceuticals: Filtration and sterilization processes used for pharmaceutical-grade water for infusions, process gases, biological product serums, and various pharmaceutical intermediates.

Food and Beverage Industry: Processes for purification and sterile handling applied in the manufacturing of food additives such as beer, wine, fruit wine, sake, baijiu, huangjiu, fruit juices, bottled water, tea beverages, soy milk, monosodium glutamate, and more.

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