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Porex PTFE Membranes

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Porex

Advantages of Porex PTFE Membranes

PTFE Fact Sheet

The advantages of Porex PTFE are striking in terms of production, performance, product range, and cost of use.
  • Porex PTFE membrane is strong and robust; it does not require a laminated support for handling, but is available laminated to a polypropylene backing upon request
  • Three dimensional pore structure with good control over pore size and pore distribution with omni- directional flow and high tensile strength
  • Filtration efficiency of 0.1u (>99.999%)
  • Porex PTFE membrane is resistant to pore closure under pressure for consistent performance over the life of the filter
  • Porex PTFE membrane is USP23 approved, non-cytotoxic, chemically inert, and sterilizable by steam and EtO

Porous PTFE vs. Expanded PTFE: Comparison

Porex Microporous PTFE: Key Advantages                                                                  

  • Sintered structure is more physically robust (strong in all directions)                                 
  • High temperature use (no secondary layers)
  • Minimal flex fatigue
  • Omnidirectional- no backward installation
  • Membrane does not easily collapse when pressure is applied
  • No support back necessary
  • East to use in automation
  • Water and other contaminants do not easily adhere to the surface
  • Structure allows plating or bonding of secondary layers
  • UL-94 flammability and UL-746C weatherability listings

Expanded PTFE: Key Advantages         

  • Lower density- 80% open area
  • Higher air flow
  • Similar water intrusion pressure
  • Lower sound blocking for thin membranes
  • Laminated support can offer other forms of protection
 

Typical Uses for Porex Microporous PTFE

Laboratory Filtration 
PTFE membrane discs are perfectly suited for laboratory scale filtration of aggressive organic solvents, concentrated acids, alkalis, and cryogenic fluids, which would attack other filtration membranes. They are also well suited for air sampling and particulate analysis.
 
Porex PTFE membranes offer a range of thickness and pore size previously unavailable to filtration device manufacturers. Since they require no laminated support, increased temperature and chemical resistance are possible. Porex PTFE membranes are available in custom width rolls to accommodate automated assembly equipment for disposable disc filters. Standard disc thickness ranges from 0.5mm to 3.5mm, so Porex PTFE discs are also suitable for use as column support in chromatographic separations.
 
Typical laboratory applications include:
  • Clarification of HPLC solvents
  • HPLC sample preparation
  • Chromatography column support
  • Filtration of high purity gases
  • Clarification of non-aqueous fluids
  • Air sampling
  • Particulate analysis
  • Venting of containers
 
Filtration
  • Liquid and gas
    • Laboratory scale (Porous discs (frits) and sheets)
    • Industrial scale (Bulk roll media)
 
Venting
  • Automotive Vents
    • Headlamps
    • Electric Motors
    • ABS Brakes
    • Batteries
  • Healthcare Vents
    • Catheters
    • Suction canisters
    • Drainage bags
    • Medical/surgical instruments
    • Sterilization
  • Packaging Vents
    • Caps and closures
  • Electronic Vents
    • Cabinet housings
    • Power supplies
    • Memory storage devices
 
Diffusion / Barrier
  • Humidity Sensors
  • Oxygen Sensors
  • Toxic gas Sensors
  • Fuel Cells
  • Advanced batteries
  • pH electrodes
  • Acoustic and audio vents
 
See complete standard sizes here.