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PTFE Membrane Laminated Fiberglass Needle Felt Filter Bags

Fiberglass needle felt PTFE membrane filter bags are high-performance filtration products specifically designed for high-temperature flue gas dust collection applications. They are manufactured using fiberglass needle felt as the base material, with a PTFE (Polytetrafluoroethylene) microporous membrane laminated onto the filter media surface through a high-temperature, high-pressure bonding process. This advanced membrane technology significantly enhances the overall performance of the filter bag, providing superior filtration efficiency, easier dust release, lower operating resistance, and extended service life.

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Description

Filmedia® is a professional manufacturer of dust collection filter bags. We supply diversified material filter bags with customized sizes and surface treatments, serving industrial dust removal systems across global industries with reliable quality and full technical support.

Base Fabric Material – Fiberglass Needle Felt

Fiberglass needle-punched felt is a high-performance filtration material with a well-engineered structure. It not only possesses the advantages of fiberglass fabrics—such as high-temperature resistance, corrosion resistance, dimensional stability, minimal elongation and shrinkage, and high strength—but also features a felt layer composed of individual fibers arranged in a three-dimensional microporous structure with high porosity. Compared to other high-temperature synthetic fiber felt filter bags, it offers distinct advantages such as lower cost and superior temperature resistance, although its operating resistance is higher than that of standard high-temperature synthetic fiber filter materials.

100% Fiberglass Needle Felt

Physical Properties and Chemical Properties

Diameter	≤350 mm
Weight	850 g/m² ±10%
Temperature (℃/℉)	Continue: 120/248, Instant: 240/464
Air permeability(L/m².s)	200-350
Tensile strength(N/5cm)	warp	≥900
	weft	≥1050
Tensile elongation(%)	warp	≤35
	weft	≤60
Heat shrinkage(%)	warp	≤1.5
	weft	≤1.0
Finish treatment	Singeing, Calendering, Heat setting
Anti-acid	Excellent
Anti-alkali	Excellent
Anti-abrasion	Excellent
hydrolysis stability	Good

PTFE Membrane Lamination for High-Efficiency Dust Filtration

Shifts from traditional “depth filtration” to “surface filtration.” The microporous membrane blocks virtually all dust; capture efficiency reaches 100% for dust particles larger than 5μm and 99.5% for ultrafine particles smaller than 1μm. Overall filtration precision reaches as fine as 0.3μm, enabling near-zero emissions.

The PTFE membrane surface is extremely smooth with a very low coefficient of friction. Dust cannot penetrate the filter media but instead accumulates on the surface. Actual operating pressure drop is typically below 800 Pa.

Protected by the highly chemically stable PTFE membrane, the base material is shielded from direct erosion by acidic or alkaline gases. With proper use and maintenance, the average service life exceeds 2–5 years—and can even surpass 7 years under optimal operating conditions—significantly reducing the frequency of filter bag replacements and associated downtime costs.

The microporous membrane effectively blocks the penetration of moisture and oil. Combined with the inherent corrosion resistance of the fiberglass substrate, the filter bag maintains stable performance even in complex, harsh environments characterized by high temperatures, high humidity, and high corrosivity.

Common Application Industries

Fiberglass filter bags are suitable for pulse-jet and high-speed reverse-blow baghouse dust collectors and are widely used in the following industries.