• Porex Porous PTFE Materials

Porex Virtek™ Technical Material Overview

Why choose POREX Virtek™ sintered PTFE

for Medical, Analytical or Industrial Applications?


POREX Virtek™ porous sintered PTFE materials offer excellent control over pore size, porosity, permeability, water intrusion pressure and thickness. Engineered to your specifications to help deliver precision, accuracy and reliability, POREX Virtek™ materials exemplify the critical design standards required in many challenging filtration, venting and diffusion applications. POREX Virtek™ also features an intricate network of open-celled, omni-directional pores that offer exceptional performance on and below the surface. Our proprietary manufacturing process results in a robust, durable, chemically resistant and design flexible material with long-term value advantages. POREX Virtek™ is available in a variety of custom shapes including rolls, sheets, slit rolls, die-cut parts, rotary cut parts, adhesive discs as well as finished components. 

Play Video Vist Gerry's Engineering Corner to learn more about the durability and easy handling of POREX Virtek PTFE.


  • Standard pore sizes from 1µ to 50µ (by Bubble Point)
  • Standard roll width 330mm
  • Available conversions: sheets, slit rolls, die-cut parts, rotary cut parts and adhesive discs 
  • Standard thickness from 100µ to 3mm
  • Service temperature range from cryogenic to +260°C
  • Air flow rates up to 13 l/hr/cm2 @ 10 mbar
  • Water intrusion pressure up to 1600 mbar
  • Non-standard requirements can be custom manufactured according to customer’s specifications

Key Characteristics: 

  • 100% PTFE
  • High Tensile Strength
  • Chemically inert
  • Compatible with steam and EtO (ethylene oxide) sterilization
  • USP class VI (bio-compatibility)
  • FDA 21 CFR 177:1550 (food contact)
  • UL 94 V-0 and 5VA certification
  • UL 746C f1 rating (outdoor weatherability)
  • Low dielectric constant
  • Low co-efficient of friction
  • Diffuse reflectivity up to 98%
  • Natural white color 
  • Can be printed or plated

Suitable for:

  • High Speed Automation
  • Ultrasonic and Thermal Welding
  • Insert Molding

Functional Applications in Venting...

Automotive Vents

POREX Virtek for automotive venting membranes are hydrophobic and oleophobic, pressure compensating elements to protect electronic control systems from pressure build-up and water intrusion. Typical use examples include:

  • Engine Management Systems
  • Headlights
  • Tire Pressure Monitoring Systems
  • Electric motor housings
  • Anti-lock Braking System
  • Traction Control System
  • Air bags

Gas Sensor Vents

POREX Virtek membranes used in protection of electrochemical sensors can control the flow of gas into the sensor to ensure a constant steady flow even at low flow rates. The membranes are easy to handle and dimensionally stable during the sintering or printing process. POREX Virtek membranes are hydrophobic, breathable, and can be used without a scrim or laminated to a strong PP mesh. POREX Virtek membranes can also be used as a “dust cover” and will not interfere with the performance of the electrochemistry. Customizable, these membranes are usually coated or printed by the customer with a catalyst. 

Cap Closure Vents

POREX Virtek membranes are hydrophobic and oleophobic vented closures mounted on a sealed container to balance the pressure between the interior and the atmosphere without loss or contamination of the contents. In liquid packaging, especially of hazardous chemicals, there is a critical need for vented caps and closures. POREX Virtek membranes are very effective and and an economical industry recognized solution to this problem. Using a single-component membrane reduces installation cost and time. The inherent membrane strength ensures reliable and repeatable performance in demanding automated welding processes, needing no housing or molded support for assembly.

IV Catheter Vents

Standard IV catheter insertion procedure is to advance the catheter into a vein until blood is seen in the “flash chamber” of the catheter. POREX Virtek™ membranes vents are ETO or steam sterilization compatible and help create a breathable liquid barrier that prevents blood bypass through the vent which helps protect the patient and healcare workers.

Chromatography Frits

POREX Virtek™ membranes for chromatography frits are used in a wide variety of sample preparation and high throughput applications. In classic SPE (Solid Phase Extraction) columns, POREX Virtek™ frit membranes facilitate column flow-through; allow for organic solvent filtration and high sensitivity analysis. Specially treated POREX Virtek™ sPTFE membrane frits used in protein precipitation and crash plate applications help improve the removal of unwanted proteins from biological samples.

Click here to download the full POREX Porous PTFE Materials PDF.