Polyethersulfone Membrane (Hydrophilic)

For General Filtration Applications


Polyethersulfone (PES) membrane for aqueous solutions provides removal of fine particles, bacteria, viruses, and fungi making it a versatile membrane for applications such as sample preparation, sterile filtration and infusion therapy. PES is an inherently hydrophilic membrane that wets out quickly and completely resulting in fast filtration with superior flow rates and high throughputs. The hydrophilic nature of PES means no added surfactants are used to increase wettability. PES membrane is also extremely low protein binding minimizing the likelihood of target analyte binding. Polyethersulfone membrane is compatible with EtO, gamma irradiation, and autoclave methods of sterilization.

Sample Preparation

The low protein binding nature of the polyethersulfone membrane makes it well suited for biological sample preparation. Available in a variety of pore sizes, the membrane can be used for coarse particulate removal in prefiltration applications or as a fine final filter for clarification. An excellent choice for bead-based, multi-plexed assays, the PES membrane yields high microsphere recovery and reduces the incidence of false positives in serological assays.


Sterile Filtration

Available in 0.1 and 0.2 µm pore sizes, the polyethersulfone membrane provides sterilization of buffers, culture media, additives, and pharmaceutical filtration. If mycoplasma contamination is a concern, the 0.1 µm PES membrane provides assurance that critical samples will not be contaminated.



For infusion therapy, the inherent hydrophilicity of the membrane allows fast priming of a finished device and provides a barrier to air passing through the wetted membrane. While wetting out quickly, PES membrane provides high throughputs over time extending the life of the finished product. The membrane has a uniform pore structure for application requirements of sterile fluids and particulate retention. Our polyethersulfone membrane also complies with United States Pharmacopeia (USP) Biological Reactivity Test, In Vivo <88> for biosafety, cytotoxicity, and hemolysis testing.


Microbial Analysis

Available in a modified black format, the PES membrane provides a contrasting membrane for microbiological and particulate analysis. The dark background provides excellent contrast for counting opaque colonies in labs and monitoring light-colored particulate in process fluids. Black PES membrane is an excellent medium for the isolation and enumeration of yeast or mold colonies.


Products in this datasheet may be covered by one or more patents including EP 1,056,540; US 6,878,343; US 7,135,117; and US 7,371,325.