Fumasep FS-950

Brand: FuMA-Tech
Product Code: 34010052

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Please note that this material has been discontinued. Limited stock remains.

Fumasep FS-950 membrane is perfluorinated cation exchange membrane - non-reinforced with low resistance, high mechanical stability, low dimensional swelling, and high stability in acidic environment.

Fumasep FS-950 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 FS-950 Features:

• Applications: Redox-Flow Battery, e.g. Vanadium-Redox-Flow Battery (VRB), using aqueous acidic conditions.
• Cation Exchange Membrane
• Thickness (dry): 45 - 55 micrometers (1.7 - 2.1 mil)
• Sizes: 10cm x 10cm, 20cm x 30cm

Fumasep FS-950 Technical Specification Sheet


The membrane is the transparent (slightly opaque) foil, delivered on a backing foil (colourless rigid PET foil). Pull off carefully the membrane from the backing foil. The membrane is ready to use.


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 is delivered in H-form and dry form. The membrane does not need any pretreatment and is ready for use. Please assemble the membrane in dry form. If you have any concerns about storage, chemical stability, and pretreatment please feel free to contact us for further information.

Membrane Properties
Membrane Cation Exchange Membrane
Thickness 45 - 55 µm (microns)
Appearance / Color Transparent
Backing Foil PET
Delivery Form Dry
Reinforcement None
Counter Ion H+ form
Weight Per Unit Area 8.2 - 9.2 g cm^-2
Specific Area Resistance < 0.1 Ω cm2 (0.5 M H2SO4)
Selectivity > 98 % (0.1 / 0.5 mol/kg KCl at T = 25 °C)
Proton Transfer Rate > 8000 μmol min^-1 cm^-2
Dimensional Swelling in Vanadyl Sulfate at T =25°C < 4 %
Uptake in Vanadyl Sulfate at T =25°C < 5 wt %
Tensile Strength - max. (MPa) 36 – 50 MPa
Yield Strength at 23°C / 50 % R.H. 19 – 28 MPa
Young’s modulus at 23 °C / 50 % r.h. 270 – 340 MPa
Elongation to Break (%) 90 – 150
Bubble Point Test in Water at 25°C > 3 bar

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