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E-620(K) Cation Exchange Membrane
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E-620(K) Cation Exchange Membrane

Price range: 20.00 € through 65.00 €

Fumatech E-620 (K) ultra-thin cation exchange membrane with full pH stability (0–14), very low resistance, and exceptional dimensional stability — suited for a broad range of electrochemical applications including flow batteries.

Read more about the product

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About the product

The E-620 (K) is a 20 µm non-reinforced cation exchange membrane from Fumatech, offering very low area resistance (<1.0 Ω·cm²), high selectivity (>96%), and full pH stability across the entire range of 0–14. Its extremely low dimensional swelling (<3% in water) makes it exceptionally stable under varying electrolyte conditions.

At just 17–23 µm, it is the thinnest membrane in the range, delivered in K⁺ form and stabilised with PEG to prevent embrittlement during dry storage. Before use, simply soak in DI water or the application solution to remove the PEG additive. Note that once hydrated, the membrane should not be allowed to dry out as this may cause micro-cracks.

Operating temperature range is 15–40°C. The burst test >3 bar and Young’s modulus >600 MPa confirm reliable mechanical integrity despite the ultra-thin profile.

Main application area: Organic redox flow batteries (ORFB)

 

 
To suit your specific research needs, we provide membranes in several formats:
  • Standard Sheets: 12.5 x 12.5 cm and 20 x 30 cm sheets for custom cutting.
  • Pre-Cut for Our Cells:
    • Cut w. alignment holes: For all our single cell test hardware.
    • Cut for X-Stack: Perfectly sized for our X-Stack electrolyser.
    • Cut for S-Stack: Designed for our S-Stack flow battery.
    • Cut with manifold holes: For our 3 and 4-compartment X-Cell.

For other dimensions or specific cut-outs, please make an inquiry. We are happy to provide custom solutions for your project.

Property Unit E-620 (K)
Membrane type   Cation exchange membrane
Appearance   Light brown, transparent
Backing foil   PET
Reinforcement   None
Counter ion   K form
Delivery form   Dry
Additive   PEG
Thickness (dry) µm 17 – 23
Weight per unit area (dry) g m⁻² 26 – 35
Area resistance in Na⁺ form Ω cm² < 1.0
Selectivity 0.1 / 0.5 mol/kg KCl at T = 25 °C % > 96
Dimensional swelling in H₂O at T = 25 °C % < 3
Young’s modulus at 23 °C / 50% r.h. MPa > 600
Tensile strength at 23 °C / 50% r.h. MPa > 30
Burst test in water at T = 25 °C bar > 3
pH stability range at 25 °C pH 0 – 14
Operational temperature range °C 15 – 40

Copied from Fumatech’s offical datasheet

Technical Datasheet fumasep E620 KonPETv23

Video Guide for Removing Support Film

Support & Inquiry

Do you have specific questions or would you like help in selection and configuration of our product:

E-620(K) Cation Exchange Membrane

You are very welcome to contact us in the form here. We are ready to support you in selecting the best solutions for your R&D.

Always include as much information as you can about your project, what type of chemistry you are planning to use, what is the purpose of the equipment  you are interested in. That will make it much easier for us to guide you towards the best solution for your project. 

Your question and Inquiry

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