Polyethersulfone (PES) Membrane

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Cobetter polyethersulfone (PES) membrane is made of a modified polyethersulfone polymer cast. The optimized asymmetric structure, enhanced hydrophilicity and high porosity provides extraordinary high flow rate and contaminants retention capacity. The product uniformity results in consistent filtration performance. Its high mechanical strength supports all kinds of assembling technologies.

Besides the hydrophilic nature of polyethersulfone, Cobetter PES membrane is further surface treated for more optimized hydrophilicity. The wetting time by saturated salt water is less than 3 seconds, given environmental temperature higher than 0°C.

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The high asymmetric structure, as shown in figure, promises marvelous particle retention capacity and low extractables and drug & protein adsorption. The upstream surface, with larger pore size, functions as a pre-filter layer to retent big contaminants such as drug crystals and solid particles; on the other hand, the downstream surface with smaller pore size plays a role as a precise-filter layer, to retent all the rest contaminants. The gradient filtration principle and high porosity (>75%) ensures our promised filering efficiency.   


Cobetter offers hydrophobic & oleophobic surface treated PES membranes that have excellent repellency to liquids, which is an ideal alternative option for PTFE membrane venting and gas filtration applications where gamma irradiation is used for product sterilization. Cobetter PES membrane is also available in positively-charged modified version, providing a solution for protein / endotoxin binding liquid filtration applications.



Certified Biological Safety( ISO10993/USP Class VI )


Low Drug and Protein Adsorption

Low Extractables

Wide Range of Pore Sizes

Outstanding Flow Rates & Longer Life

Lot-to-lot Consistency

Compatible with Different Sealing Methods

Ultrasonic, Heat, Mechanical, RF Welding, Inserting Molding

Sterilization Compatibility

Autoclave, Ethylene Oxide, E-Beam, Gamma Irradiation



Available Pore Sizes (μm)

0.05,   0.1,   0.2,   0.2+Positive,   0.45,   0.65,   0.8,   1.2,   3.0,   5.0,   8.0,  10,  12


Typical Applications

- IV Infusion Filters
- IV Set Drip Chambers
- Epidural Filters
- Medical Water Filters
- Drug Filtration

- POCT Diagnosis Test Strips

- Blood Filtration


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




  • UltraFiltration (UF) Membranes Cobetter UltraFiltration(UF) membranes are engineered for fluid purification or clarification in variety of applications, including concentration, dilution and buffer exchange of biopharmaceutical process development for monoclonal antibodies, albumin, hormones, and vaccines & growth factors. Besides caustic and chlorine resistant, the PES composite membranes combine advantages of superior flow rate, low extractables & protein-binding, harsh chemical cleaning with excellent mechanical strength.
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