Polyethylene (PE) Membrane: PFAS-Free Performance for Applications Traditionally Served by PP and PTFE

Polypropylene (PP) membranes have long been used across laboratory, pharmaceutical, medical device, and microelectronics industries. Their inherent hydrophobicity, broad chemical compatibility, and reliable airflow performance made them a preferred material for solvent filtration, particle control, and venting applications. As availability of polypropylene membrane products decreases, engineers and process specialists are evaluating alternative materials to maintain performance and supply continuity. 

Polytetrafluoroethylene (PTFE) membranes are often considered as a replacement due to their hydrophobic nature and chemical resistance. However, PTFE is a fluoropolymer and may not align with PFAS-free material requirements that are increasingly driven by regulatory considerations, sustainability initiatives, and customer specifications. 

Sterlitech introduces Polyethylene (PE) Membrane Filters as a PFAS-free alternative for hydrophobic filtration and venting applications traditionally served by PP and PTFE.  Ultra-high molecular weight polyethylene (UPE) membranes deliver high removal efficiency for micron-to-nanometer-scale particles, organics, metals, bacteria, virus, and other targeted contaminants.  A broad range of membrane structures and surface modifications are available to support application-specific needs.

Why Consider Polyethylene (PE) Membranes?

1. Excellent Chemical Compatibility

PE membranes offer outstanding compatibility with: 

  • High-purity organic solvents
  • Common laboratory acids

This makes PE membranes well-suited for:

  • Pharmaceutical intermediate processing
  • Chemicals and reagent purification
  • Particle control in microelectronics

For detailed solvent compatibility, refer to the Sterlitech Chemical Compatibility Chart. 

2. Reliable Hydrophobic Performance for Venting Applications

PE membranes are designed to maintain stable airflow performance while preventing moisture intrusion into the pore structure, making them ideal for:

  • Sterile venting of medical devices
  • Moisture barrier applications
  • Airborne particulate monitoring (laboratory testing)

This stability is essential for preserving sterility and process stability in regulated environments. 

3. Gamma Irradiation Compatibility 

Unlike PTFE and polypropylene membranes, polyethylene membranes are compatible with gamma irradiation sterilization, providing significant advantages for: 

  • Sterile medical devices
  • Bioprocessing systems
  • Closed sterile liquid transfer systems 

Gamma compatibility can simplify system integration and reduce validation complexity. 

4. PFAS-Free Solution

Polyethylene membranes are manufactured without fluoropolymers and do not intentionally contain PFAS, making them a dependable alternative for applications where PFAS-free materials are required due to regulatory requirements, corporate sustainability initiatives, or product formulation standards. Documentation is available upon request.

Polyethylene membranes are available in more than 100 configurations with retention ratings from 1nm to 1.0µm, including: 

Hydrophobic
Hydrophilic
0.001 µm* 0.02 µm
0.005 µm*  0.05 µm 
0.1 µm  0.1 µm 
0.2 µm 0.2 µm 
0.45 µm  
0.65 µm  
1.0 µm   

*1-5nm pore sizes are asymmetrical with a graduated pore size structure across the membrane thickness (more open at the inlet, tighter at the outlet) to achieve high retention while maintaining high flow rates. 

Additional options include surface modifications with positive or negative charges, as well as specialized chelation functional groups for targeted affinity binding. 

Formats Available: 

  • Precut discs
  • Sheets
  • Rolls up to 800 linear feet and up to 22 inches in width

Performance Specifications: 

Sterlitech maintains inventory of the following standard materials: 

Pore Size (µm)
Thickness (µm)
Typical Clean Airflow1
Typical Clean Water Flow2
IPA  Bubble Point (bar) 
0.1  60-90  0.15  3 2.48-3.45 
0.2 80-110  0.28  6.8 1.65-2.21 
0.45 125-168  0.34  12.5 1.03-1.45 

(1) L/min*cm2 @70 mBar; Estimated assuming linear relationship between volumetric flow and differential pressure 
(2) mL/min*cm2 at 690mbar; For properly wetted membrane filters 

These characteristics make PE membranes well-suited for applications requiring defined retention and consistent flow performance. 

Evaluate a PFAS-Free Alternative 

If you are assessing alternatives to polypropylene membranes, Sterlitech can support your evaluation with samples and technical guidance.

Contact Us to request PE membrane samples for compatibility and performance testing in your specific application.