Polyimide lifting slings are used for fire rescue ropes and the hoisting of hot steel coil castings.

The polyimide lifting sling combines hundreds or even thousands of continuous polyimide filaments into a single, uniformly strong and resilient yarn, which is then twisted into a precise structure. Multiple strands of this yarn are carefully woven together according to a meticulously designed pattern. The resulting flat woven tape undergoes heat-setting treatment to relieve internal stresses and ensure dimensional stability. Finally, based on the customer’s specific length and specifications, the tape is transformed into a lifting sling equipped with eyelets at both ends—thanks to specialized high-strength sewing techniques and a seamless joining process.

1. High and Low-Temperature Performance: It remains flexible and does not become brittle in a liquid helium environment as low as -269°C, while also capable of continuous operation in an air environment at 260°C for extended periods. Moreover, it can even withstand short-term temperature spikes up to 400°C to 500°C without melting—instead, it undergoes only slow carbonization, providing valuable extra time for safety in emergency situations.

2. Inherently flame-retardant with excellent thermal stability: Its limiting oxygen index (LOI) is as high as 38% or more—significantly exceeding the oxygen content in air (21%), classifying it as a hardly flammable material. When exposed to open flames, it does not burn; instead, it chars and forms ash. Once removed from the heat source, it self-extinguishes immediately—and crucially, it never produces molten dripping substances, thereby eliminating the risk of secondary ignition and burns.

3. Exceptional Mechanical Performance: Despite its extremely low density, it boasts remarkably high strength, coupled with a high modulus and outstanding creep resistance. This means it exhibits minimal elongation under load, providing stable support while also being highly wear-resistant, cut-resistant, and long-lasting in service. Additionally, its weight is significantly lighter than traditional metal slings, greatly reducing the physical strain on operators.

4. Excellent chemical stability: It exhibits outstanding resistance to most common organic solvents, acids, bases, and oils, and also demonstrates exceptional hydrolysis resistance. This enables it to operate reliably in challenging industrial environments—such as chemical plants or electroplating facilities—without easily being corroded or degraded.

5. Excellent electrical insulation: Possessing high resistivity, a low dielectric constant, and minimal dielectric loss, it is an advanced insulating material. This makes it particularly crucial when lifting delicate electrical equipment or in applications requiring anti-static measures and electromagnetic shielding—such as the handling of aerospace components.

6. Low-toxicity and environmentally friendly: The smoke produced during high-temperature decomposition is relatively low in toxicity, ensuring good safety.

Applications of Polyimide Slings

1. High-Temperature Heavy Industry Sector

Steel metallurgy: Lifting and transporting hot, glowing steel coils, ingots, molds, and castings—these are essential safety tools for steel plants and casting workshops.

Glass Industry: Handling high-temperature glass sheets freshly formed in the furnace, glass melting pots, and fiberglass products.

Ceramics and Refractories: Safely handling and retrieving sintered ceramic products, tiles, or refractory bricks from high-temperature kilns.

2. Aerospace and Advanced Manufacturing

It is used for the maintenance of aircraft engines, the installation and lifting of rocket components, satellites, and other precision equipment. Its insulating, non-magnetic, and lightweight properties meet the stringent requirements of the aerospace industry.

In the semiconductor manufacturing industry and high-temperature processes of LCD panel production lines, it is used for fixing and handling glass substrates or silicon wafers.

3. New Energy and Specialty Chemicals

Lithium-battery manufacturing: In the drying process after battery electrolyte injection, these are used to securely bundle and fix the cells, capable of withstanding high baking temperatures without contaminating the battery.

Lifting and handling pipelines, containers, and equipment exposed to corrosive chemicals or high-temperature environments in chemical plants and refineries.

4. Emergency Rescue and Safety Protection

Used as rescue ropes, safety guide ropes, and escape belts for firefighters in high-temperature fire scenes, providing top-level fire protection.

Used for equipment lifting and maintenance in scenarios within the power industry, substations, and other applications requiring electrical insulation.

5. Low-temperature field

For the maintenance of equipment and lifting of components used in facilities handling liquefied natural gas (LNG, -162°C), liquid nitrogen (-196°C), liquid helium, and other ultra-low-temperature media, its flexibility under cryogenic conditions is second to none.

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