In which high-temperature and flame-retardant applications can fiberglass needle-punched felt be used?

I. What is Fiberglass Needle-Punched Felt?

Simply put: Fiberglass is chopped and then bound together using a needle-punching machine, similar to felting wool, to form a thick, felt-like material. The difference between needle-punched felt and chopped strand mat is that chopped strand mat uses chemical adhesives, while needle-punched felt relies solely on physical binding to form the fibers. It offers good air permeability, high temperature resistance, and stable chemical properties.

Two main manufacturing processes:

One-step method (direct web formation): Fiberglass is drawn directly from the furnace onto a conveyor belt and then needle-punched for shaping. High efficiency and low energy consumption.

Two-step method (web formation + needle punching): Short fibers are first formed into a thin web using a carding machine, then multiple layers are stacked and needle-punched. More flexible production, suitable for products of varying thicknesses.

II. Where is Needle-Punched Felt Used?

High-Temperature Flue Gas Filtration: Flue gas temperatures in steel mills, cement plants, and waste incineration plants reach 200-400℃, where ordinary filter bags would melt. Fiberglass needle-punched felt filter bags are standard equipment.

Chemical pipeline insulation: Wrapping steam pipes and acid/alkali liquid pipes, providing corrosion resistance, reducing heat loss, and preventing worker burns.

Building sound insulation: Soundproofing for equipment rooms and air conditioning rooms; more heat-resistant and non-flammable than polyurethane foam.

Automotive heat insulation: Heat insulation layer near engine compartments and exhaust pipes; heat-resistant, non-flammable, and lightweight.

Battery pack protection: Serving as a heat-insulating and flame-retardant layer inside new energy vehicle battery packs. The needle-punched felt process allows for a denser felt structure, suitable for high flame-retardant applications.