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 excellent gas permeability.

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.  

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)

Excellent 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

Support Type

Polyester, Polypropylene, Polyolefin, or unlaminated (without substrate/lamination)

Membrane Formats

Roll, Sheet, Disc, Adhesive Backing, Customization11