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Medical

Hydrophobic PTFE Membrane

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Cobetter Hydrophobic ePTFE membrane is made from pure Polytetrafluoroethylene (PTFE), combined with long duration aqueous repellent capability and optimized porous structure. The hydrophobic nature of PTFE promises its long-lasting unwetted status even be kept contacting with water or other normal liquids, and the open porous structure provides a wide range of pore size, 0.02μm to 10μm, ensuring the retention of bacteria, virus, and particles is always effective while maintaining the high gas permeability.


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The combination of water resistance, air permeability, and particle retention introduces ePTFE into various medical applications involving long-lasting liquid resistance and air venting / gas filtration, based on which Cobetter ePTFE membrane is compatible with multiple sealing methods, ultrasonic, heat, radio frequency welding, mechanical, and inserting molding, offering our customers more possibilities of sealing solutions, given the quality is as marvelous as promised. 

Laminated PTFE membranes are widely used as air vent function in medical devices(especially in drug delivery application).Considering the compatibility of materials during welding, Cobetter could offer PTFE membrane laminated with Polyester, Polypropylene, Polyolefin non-woven substrates. For example, a PTFE membrane with polyester substrate is more suitable for welding with Acrylonitrile Butadiene Styrene(ABS), Polycarbonate, and Poly(methyl methacrylate). And for Polypropylene, High-density polyethylene , a PTFE membrane with Polyolefin substrate works better. For applications requiring extreme low chemical extractables, low metal ion leachables, long-lasting tolerance with high temperatures, or better biocompatibility, PTFE without substrate/ lamination is more suitable. For example, gas and liquid sampling analysis in the NOISH regulations mostly uses unsupported PTFE because of its high purity and low contamination.  

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PFOA Free
Cobetter can supply PFOA free membrane filter that do not contain Perfluorooctanoic acid (PFOA), its salts and PFOA-related substances, which comply with relative regulation requirements in European REACH EU2017/1000, EC1907/2006 (REACH), and POP EU2020/784. 


Certified Biological Safety (ISO 10993/USP Class VI)

Great Air Permeability, Outstanding Air Flow Rates

Optimized Backing Material,Better Sealing Capability

Wide Range of Pore Size (0.02-10μm)

High Water Entry Pressure (WEP)

HEPA/ULPA/STERILE Grade

Compatible with Different Sealing Methods

Ultrasonic, Heat, RF Welding, Mechanical, Inserting Molding

Serilization Compatibility

Autoclave,Ethylene Oxide, E-Beam, Gamma Irradiation



Available Pore Sizes (μm)

0.02 /  0.03 /  0.05 /  0.1 /  0.2 /  0.45 /  0.8 /  1.0 /  2.0 /  5.0 /  10.0

Typical Performance Characteristics (*0.2μm)

Filtration Efficiency ≥99.99999% Brevundimonas diminuta
Air Flow Rates Gurley 17-49sec
WEP(60s) >450 KPa
Thickness 280-440μm (Supported)

Typical Applications

- Air Vent / Ventilation

- IV Filter Vent
- Transducer Protector (TP)
- Bacterial Air Vent
- Sensor Protection Cover
- Package Vents
- Drip Chamber Spike Vent
- Dispensing Pin

- Urine Meters/Bags
- Ostomy Pouches
- Insufflation Filters

- Suction Canister

- Air Sampling

- Surgical Low Penetration Air Filter

- Drug-eluting Stents 



Support Type

Polyester, Polypropylene, Polyolefin, PTFE membrane without substrate, PTFE membrane without lamination


Membrane Formats

Roll, Sheet, Disc, Adhesive Backing, Customization


For technical data sheet or application inquiry, you are more than welcome to contact our sales representative by sales@cobetterfilter.com or leave a message






  • Hydrophilic PTFE Membranes Cobetter hydrophilic PTFE (polytetrafluorethylene) membrane filter has a durable wide operating temperature range and resistance to the destructive effects of many chemicals. It can be used to filter aqueous fluids without prior wetting.
  • Oleophobic PTFE Membranes Cobetter Hydrophobic PTFE membrane is made from pure PTFE membrane bonded to a polypropylene support. The extreme chemical compatibility (pH 1-14) makes them very useful for the filtration of solvents and acids or other aggressive chemicals, for which other membrane filter types are unsuitable. Due to their hydrophobic characteristics, they must be pre-wet with a solvent such as ethanol or methanol before the filtration of aqueous solutions.
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