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


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

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