Polyester Needle-Punched Felt

Polyester needle-punched felt is a non-woven filter media made from polyester staple fibers that are carded, laid into a web, and mechanically entangled by needles.
This process creates a three-dimensional fiber structure with high porosity, stable permeability, and good mechanical strength, making it suitable for both dust
collection and solid–liquid separation.

• Material: 100% polyester fibers (optional scrim reinforcement)
• Structure: non-woven, random fiber matrix (not woven warp–weft cloth)
• Typical range: 300–650 g/m², thickness around 1.7–2.5 mm

Polyester felt is designed for medium-temperature filtration. It performs reliably when the system stays within its recommended temperature window.

• Continuous operating temperature: about 120–130 °C
• Short-term peak temperature: up to about 140–150 °C
• Best performance in dry, non-acidic, non-alkaline flue gas conditions

If your process frequently exceeds 150 °C or involves strong acids/alkalis and high moisture, higher-grade media such as PPS, PTFE, or P84 may be more appropriate.

Polyester needle felt is popular because it offers a good balance of performance and cost in general industrial filtration.

• High filtration efficiency for fine dust and particulate
• Good mechanical strength and dimensional stability under normal conditions
• Abrasion resistance suitable for many baghouse and filter-press duties
• Easy cleaning by pulse-jet, mechanical shaking, or washing (in liquid filtration)
• Cost-effective and easy to source and replace compared with high-temperature specialty felts

Polyester felt is widely used wherever temperatures are moderate and gas or liquid chemistry is not strongly corrosive.

• Dust collection in cement mills, asphalt plants, woodworking, grain handling
• General industrial baghouses for material conveying and packaging systems
• Solid–liquid separation in filter presses for municipal and industrial wastewater
• Air pollution control in medium-temperature boilers and process exhaust
• Metalworking coolant and process-liquid filtration when chemistry is compatible with polyester

It is not recommended for high-humidity, strong acid/alkali, or high-temperature (>150 °C) environments.

Polyester needle felt can be supplied with different surface finishes and functional treatments to match specific working conditions.

• Singeing – smooths the surface, reduces fiber shedding, and improves dust cake release
• Calendering – compacts the surface for lower emissions and finer particle collection
• Heat setting – improves dimensional stability and reduces shrinkage
• Anti-static – line, cross-line, or blending conductive fibers for explosion-risk areas
• Water & oil repellent – improves resistance to occasional moisture or sticky dust
• PTFE coating or PTFE membrane – provides very low emissions and more stable ΔP

Each filter media has its own best working window. Polyester is positioned as a cost-effective, general-purpose choice.

• Versus Acrylic: Polyester is more economical but has weaker hydrolysis and acid resistance. Acrylic performs better in humid and mildly acidic conditions.
• Versus PPS: Polyester has a lower temperature limit and poorer chemical resistance, but PPS is more expensive and used for harsher flue gas.
• Versus PTFE: PTFE offers premium chemical and thermal stability and ultra-low emissions, but at significantly higher cost. Polyester suits normal, non-corrosive applications.

If you share basic operating data (temperature, humidity, chemistry, dust type), we can help confirm whether polyester felt is the right option or propose an alternative media.