Fumasep F-1850

Brand: FuMA-Tech
Product Code: 5041656

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Fumasep F-1850 membrane is a flourinated cation exchange membrane with low resistance, high blocking capability of vanadium ions, and high stability in acidic environments. The polymer composition of this membrane is based on the perflurosulfonic acid resin with long side chains.

Fumasep F-1850 membrane comes in either a 10cm x 10cm or 20cm x 30cm size sheet.

Fumatech membranes are highly sensitive to differences in humidity and moisture content. Therefore the membranes can vary +/- 0.5cm from the original cut sizes. Also due to this sensitivity the manufacturer expects wrinkles to form, however soaking the membranes in deionized water will return the membranes to the full size planar state according to the manufacturer.

Fumasep F-1850 Features:

• Applications: Electrochemical processes: Redox-Flow Battery, Vanadium Redox Flow Battery (VRB), using in aqueous acidic conditions or other electrochemical applications
• Cation Exchange Membrane
• Thickness: 45 - 50 micrometers (1.77 - 1.97 mil)
• Sizes: 10cm x 10cm, 20cm x 30cm

Fumasep F-1850 Technical Specification Sheet


The membrane is the colourless, transparent foil, delivered on a backing layer (white rigid PET foil). Pull off carefully the membrane from the backing foil.


Keep membrane package closed / sealed when unused. Unpack membrane only for direct use and process immediately after opening. Store, handle and process the membrane in a clean and dust-free area. Use only new and sharp knives or blades, when cutting the membrane. Always wear protective gloves when handling the membrane. Handle with care, be sure not to puncture, crease or scratch the membrane, otherwise leaks will occur. All surfaces in contact with the membrane during handling, inspection, storage and mounting must be smooth and free of sharp projections.

Pre-Treatment and Conditioning:

The membrane does not need any pre-treatment and is ready for use. Please assemble the membrane in dry form. Membranes will expand and contract based on electrolyte content. If you have any concerns about storage, chemical stability, and pre-treatment please feel free to contact us for further information.

Long Term Storage:

The membrane can be stored dry for an unlimited amount of time. However, the membrane has to be conditioned (washed and rinsed) prior to use.

Please note that a current lead time of one to two weeks is to be expected.

Membrane Properties
Membrane Cation Exchange Membrane
Thickness 45 - 50 µm (microns)
Appearance / Color Transparent / Colourless
Backing Foil PET Foil (white)
Delivery Form Dry
Reinforcement None
Tensile Strength - max. (MPa) 24 - 30 MPa
Non-Std Modulus (MPa) > 230 MPa
Yield Strength at 23°C / 50 % R.H. 8 - 12 MPa
Elongation to Break (%) 360 - 390 %
Specific Area Resistance < 0.30 (in 0.5M H2SO4) Ω•cm2
Uptake in Vanadyl Sulfate at T =25°C 3 wt %
Dimensional Swelling in Vanadyl Sulfate at T =25°C 4 %
Weight Per Unit Area 9.9 - 10.9 g•cm2

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