Unique-Mem® Unlaminated Track-Etched Membranes

Precise Control Over Pore Size & Pore Density

Unique-Mem track-etched membranes
SEM image showing the single-layered membrane with cylindrical shaped pores that penetrate the membrane to reach an exact flow-through and WEP

Unique-Mem® track-etched membranes consist of a single, unsupported membrane layer (PET or PC) with cylindrical shaped pores that penetrate the membrane in defined angles. Because of this angled pore structure which divides multiple pores on one side to a single pore on the other side, regular pore sizes and densities can be achieved. Thus, exact flow-through and water entry pressure (WEP) can be reached.

Oxyphen´s track-etched membranes are resistant to pressure changes, memory effects and offer optimal flex-fatigue properties. ​Their naturally smooth surface delivers outstanding backflushing abilities in cell-culturing or water filtration as well as excellent repellency from liquids and solids for flow rate consistency during operation. Our membranes are available using hydrophilic, hydrophobic or oleophobic material and have precisely determined flow rates which can be customized to your application.

Unique-Mem® track-etched membranes are biologically inert, low protein binding, low in extractables and leachables, and endotoxin-free. They show high chemical resistance and therefore are well suited for organic-solvent applications. It is common for gamma-ray and X-ray sterilization methods to be used with our technologies. as well.

​All Oxyphen membranes are PFOA-free and can be used freely in accordance with the latest REACH legislation from July 4, 2020.​

  • Single, unsupported membrane layer​
  • Customizable flow rate (pore size, pore density, thickness)
  • Consistent flow-rates and Water-Entry-Pressure characteristics​
  • Transparent or translucent depending on pore density​
  • Adjustable burst-pressure rate​
  • Hydrophilic, hydrophobic or oleophobic treated (extended hydrophilic coating available)​
  • IP 6X-rated protection according to DIN 40050 ​
  • USP class VI​
  • Biological inert / low protein binding​
  • High chemical resistance​
  • Thermally stable ​
  • Self-cleaning and reversible function through minimal pressure difference​
  • Resistant to Gamma-ray and X-ray sterilization​
  • 100% Free of PFOA: Compliant with (EC) 1907/2006 REACH / Regulation (EU) 2019/1021 POP
Specification Unique-Mem® Track-Etched Membranes
Bandwidth (mm)
10, 13, 14.5, 20 & custom sizes
High Quality Raw Materials
PET – naturally slightly hydrophilic
PC – naturally slightly hydrophobic
Pore Size Ranges
0.1µm to 10µm
Pore Density Ranges
105 to 109 pores per cm2
Thickness Ranges
8µm to 50µm
Temperature Ranges
– 40°C and 160°C (for special application < 200°C)
Air Flow Ranges
Up to 800 l / (bar cm2 min)
Hydrophilic Treatments
Various hydrophilic treatments increase water flow rate and wetting abilities of the membrane (example: PVP treatment)
Hydrophobic / Oleophobic Treatment:
Grade up to 7.5; AATCC TM 118
Salt spray resistance test2
According to IEC 60068-2-52, based on validation by the customer
Temperature resistance test1
In accordance with ISO 16750-4
Ice water shock test1&2
In accordance with ISO 16750-4
Climate resistance test
In accordance with ISO 16750-4
Chemical resistance test1
According LV124/ ISO 16750-5
IP Protection1
IP 64/65/66/67/68, according to DIN 40050

1 Testing in Progress

2 Based on Customer Validation

Highlighted Case Study

Electronic Textiles

Oxmotex AG is a research and development company dedicated to electroosmotic vapor and fluid transport, who developed revolutionary proprietary technology for electronically controlled moisture transport in membranes and textiles. As they looked to create a new innovative technology that would provide active electronically driven moisture transport, they came to Oxyphen for a track-etched membrane solution that would be responsive to changing climates, transport moisture beyond normal sweat rates, and be comfortable for the wearer.

Related Resources

EV Battery Safety Vents Application Brochure

Learn more about Oxyphen’s hydrophobic all-in-one solution that protects critical internal components from the ingress of liquid, dust, dirt, and other contaminants while also having the ability to burst at predefined overpressures to prevent potential explosions from taking place in the event of thermal runaway.

Automotive Lighting Application Brochure

Learn more about Oxyphen’s ultra-hydrophobic fiber-based membrane vents that provide a high airflow while also preventing liquid, fine dust and particles, and humidity from entering the lighting system.

Rollstock Membrane Product Brochure

Learn more about Oxyphen rollstock track-etched membrane material for in-house and large-scale manufacturing integration, which can be produced laminated or unlaminated, converted into different lengths, and surface treated upon request.

Register for our On-Demand Webinar

Delivering Precision & Control: An Introduction to Track-Etched Membrane Technology

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Assemblies & Modules

Assemblies & Modules

To meet specific product solution requirements within the life-science and automotive spaces, Oxyphen partner with leading OEMs to develop highly tailored components and assemblies for specific applications. 

customized solutions

Customized Solutions

Oxyphen consists of a team of scientists, problem solvers, engineers, and strategic thinkers who are passionate about creating high-value solutions that bring customer’s product designs or concepts to life.

Other Membrane Technologies

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RoTrac® track-etched membranes are Unique-Mem® membranes that are supported with non-wovens (PP or PET) to create a more robust membrane. They are available as either hydrophilic or hydrophobic membranes.

Fiber-Based track-etched membranes


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Contact Us

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