Pre-oxidized wire-composite aluminum foil felt for safety protection during welding and thermal processing

Pre-oxidized fiber-reinforced aluminum foil nonwoven fabric integrates an intrinsically fire-resistant fibrous matrix with a highly reflective metallic barrier, resulting in a high-performance composite material that offers fire resistance, superior thermal insulation, and multi-layered barrier protection.

The pre-oxidized filament nonwoven substrate boasts an极限氧指数 of over 45%, rendering it completely incapable of sustained combustion in air. When exposed to open flame, it does not melt, shrink, or produce molten droplets; instead, it undergoes only slow surface carbonization, maintaining structural integrity and effectively preventing the propagation of flame and heat inward. It exhibits exceptional thermal stability, enabling long-term operation at 220°C and withstanding instantaneous flame exposure exceeding 1,000°C, thereby providing a robust and reliable high-temperature-resistant base for composite materials. Moreover, its superior mechanical and chemical properties confer excellent strength, toughness, and wear resistance to the nonwoven layer, while also offering outstanding resistance to acids, alkalis, and aging, thus delivering structural support and long-term durability to the overall material.

The high-purity aluminum foil facing serves to alter the mode of heat transfer. In high-temperature environments, thermal radiation is the dominant mechanism of heat transfer. The smooth surface of the aluminum foil reflects most of the infrared thermal radiation directly back, thereby actively rejecting heat. When combined with the substrate’s passive thermal insulation, this mechanism effectively doubles the overall thermal insulation performance. Moreover, the aluminum foil offers outstanding moisture-barrier, gas-barrier, corrosion-resistant, and electromagnetic-shielding properties, expanding the protective capabilities from mere thermal protection to a comprehensive, multi-dimensional barrier.

Through a hot-pressing process, the two layers are firmly bonded together. The synergistic working mechanism is as follows: when subjected to direct thermal shock, the aluminum foil layer serves as the first line of defense, reflecting the vast majority of radiant heat. As heat conducts to the substrate, the pre-oxidized filament nonwoven fabric, with its inherently noncombustible nature, resists the remaining heat flux and potential direct flame exposure, while its high thermal resistance and char-forming carbon layer further retard heat conduction. Ultimately, this multi-layer structure not only delivers thermal insulation performance far superior to that of single-layer materials, but more importantly, provides critical protection against dynamic thermal hazards such as welding sparks and molten-slag spatter.

Applications of pre-oxidized wire-composite aluminum foil nonwoven fabric:

1. Thermal Management in High-Temperature Industries and Manufacturing

This is its primary application area. It is manufactured as a detachable high-temperature insulation jacket, designed to encase complex, irregularly shaped components such as valves, flanges, reactors, and heat exchangers. Its outstanding reflective and thermal-insulation properties significantly reduce surface temperatures, delivering substantial energy savings—typically lowering surface temperatures by more than 100°C and reducing heat loss by 20%–30%—while also enhancing workplace safety. In industries such as metallurgy, glassmaking, and ceramics, it is used for furnace-mouth curtains and thermal shields for high-temperature conveyor belts, directly confronting radiant heat at temperatures exceeding 1,000°C.

2. Safety Protection for Welding and Thermal Processing

As a welding fire blanket, fire screen, and mat, it provides complete containment of flying weld spatter and sparks, safeguarding surrounding equipment, flooring, and flammable materials—making it a critical safety component under the hot-work permit system. Its applications are extensive in shipbuilding, heavy machinery manufacturing, and construction sites.

3. Building Fire Protection and Emergency Rescue

It is used to enhance the thermal insulation performance of the fire-exposed side of fire-resistant rolling shutters and fire doors, or as a fire-resistant wrapping layer for cable tunnels and shafts. In the fire protection field, it is an ideal material for manufacturing emergency escape fire blankets for firefighters and large-scale industrial fire emergency isolation curtains, thereby buying valuable time for personnel evacuation and fire control.

4. Specialized Transportation and Packaging of Precision Equipment

For precision instruments, military products, or high-end chemical raw materials that require temperature-controlled, moisture-proof, and antistatic transportation, the inner liners of the packaging boxes made from these materials provide reliable microenvironment control. In the new-energy vehicle sector, they can be used as protective layers for the external underbody of battery packs, offering simultaneous thermal insulation, stone-chip resistance, and electromagnetic shielding.

5. Aerospace and Other Cutting-Edge Fields

In spacecraft, it is used to protect critical wire harnesses and components from engine or aerodynamic heating; in military vehicles, it serves as an thermal insulation and noise-reduction layer in the engine compartment. Its electromagnetic shielding properties also make it suitable for use in electronic equipment compartments where interference shielding is required.

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