Description

PTFE filter bags (polytetrafluoroethylene) are high-end filtration solutions designed for extremely harsh industrial environments. Their outstanding resistance to high temperatures and aggressive chemicals makes them indispensable in specific applications.

Here’s a breakdown of PTFE needle felt filter bags:

Manufacturing and Properties:

• Material: These bags are constructed from 100% PTFE fibers, renowned for their exceptional chemical and thermal stability.
• Needle Punching: The PTFE fibers are mechanically interlocked through the needle-punching process, creating a robust and porous filtration medium.
• Key Properties:
  • Exceptional Chemical Resistance: PTFE is virtually inert, resisting almost all chemicals, including strong acids and alkalis.   
  • High-Temperature Resistance: They can withstand continuous operating temperatures up to approximately 260°C (500°F), with short-term peaks reaching even higher.   
  • Low Friction: PTFE’s low coefficient of friction facilitates dust cake release.   
  • Hydrophobic: PTFE repels water, making it suitable for humid environments.
  • High Filtration Efficiency: Provides excellent particle capture. 
• Construction: The PTFE felt is fabricated into filter bags with various configurations to fit specific filter housings. Often combined with PTFE membrane lamination to greatly increase filtering efficiency.

Applications:

• Waste Incineration: Essential for filtering highly corrosive gases from waste combustion.
• Chemical Processing: Used often in processes involving aggressive chemicals and high temperatures.  
• Coal-Fired Power Plants: Filtering flue gases, especially those containing corrosive components.
• Cement Industry: Used in high-temperature and chemically demanding applications. 
• Metallurgical Industry: Used in the filtration of gases produced from metal processing.   

Advantages:

• Ultimate Chemical Resistance:
  • Provides unparalleled protection against corrosive substances.  
• Extreme Temperature Stability: Maintains performance in very high-temperature environments.
• Long Service Life: Resists degradation, ensuring extended use.
• High Filtration Efficiency: Especially when combined with PTFE membrane technology.
• Low Pressure Drop: Can provide effective filtration with minimal pressure loss.

Finish Treatment:

• Antistatic Line Type (AS–L).
• Antistatic Blend Type (AS–B).
• Antistatic Cross Line Type (AS-X).
• PTFE Membrane (M).
• PTFE impregnation (TPI).
• Water & Oil Repellent (WR).