Filter Media

A full line of membrane and depth media choices at all scales.

Proven filter media that meets performance requirements.

From simple filtration to the most critical applications, Critical Process Filtration manufactures filters with time-tested media in a wide range of pore sizes.


PES side B1000 500

Polyethersulfone (PES)

High Capacity PES

Critical Process Filtration's flagship product, our proprietary High Capacity PES is a thick membrane with high capacity for particle retention. Ideal for high-protein solutions or when liquids contain elements that tend to bind to filter media. This membrane is utilized as a single layer in our clarification products and integrated as a prefilter with our sterilizing and bioburden control filters. See filter models.

Highly Asymmetric PES

Products constructed with this media deliver high flows with low pressure drops. The highly asymmetric structure of this membrane allows it to efficiently capture a large amount of different size particles throughout the membrane matrix while still providing a sharp retention cutoff.  See filter models.

Positively Charged PES

By adding a positive charge to our PES membranes these filters remove negatively charged particles such as endotoxins, organic molecules and colloids. See filter models.

Polypro Depth


Depth Media 

Polypropylene pleated depth media is designed for the clarification and prefiltration of liquids and air/gas. This media has broad chemical compatibility, is highly efficient and helps protect your more expensive final filters. Products made with polypropylene depth media are commonly used in water and waste water filtration.  See filter models.

Melt Blown & Nano-Spun

Melt blown and nano-spun refer to the processes used in applying polypropylene fibers to a filter core. The polymer is blown or spun in a way that creates a deep web of material for the retention of large and small particles. These filters are a very cost-effective way to reduce particles in streams and improve the performance of downstream filters when used as prefilters. See filter models.

Nylon 6,6

Nylon 6,6

Standard Nylon 6,6 

Nylon 6,6 is a polymer known for its durability, making it a reliable and long lasting membrane for filtration. It has long been used in filtering water and specialty chemicals in a variety of industries because of its versatility and chemical compatibility. See filter models.

Positively Charged Nylon 6,6 

By adding a positive charge to a Nylon 6,6 membrane, filters can remove negatively charged particles in water such as endotoxins, organic molecules and colloids. The positive charge can also help with purifying many chemical solvents by removing charged contaminants. See filter models.


Polyvinylidene fluoride (PVDF)


Naturally hydrophobic polyvinylidene fluoride (PVDF) membrane is made from a fluoropolymer that is compatible with a wide variety of chemicals and solvents. Our high capacity membrane is cast in a form that creates high void volumes and high dirt holding capacity for filtration of non-aqueous solutions or process air and gases. The broad chemical compatibility of PVDF does make it ideal for filtering chemicals and some solvents. See filter models.


Though naturally hydrophobic, our high capacity membrane is modified to make it hydrophilic and able to be wetted with water and other aqueous solutions. The broad chemical compatibility of PVDF makes it ideal for filtering chemicals and some solvents. See filter models.



Pleated fiberglass is a highly efficient media used to remove large quantities of particulates in prefiltration and clarification applications.

The high dirt holding capacity and long life of fiberglass media in prefiltration applications makes it ideal in highly loaded product streams like those in juice processing, bioprocessing, pharmaceutical and biologics prefiltration, and other chemical processing applications. See filter models.


Polytetrafluoroethylene (PTFE)

PTFE is a highly hydrophobic fluoropolymer membrane used for tank vents, and filtering process gases and non-aqueous fluids. Filters made with PTFE have broad chemical resistance and are suitable for high temperature applications.

Available pre-wetted for use in aqueous applications. See filter models.