Fumasep F-1075-PK

Brand: FuMA-Tech
Product Code: 34010039

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

Fumasep F-1075-PK is a Perfluorinated PK reinforced Cation Exchange Membrane (CEM) with low resistance, high mechanical stability, high selectivity and high chemical and oxidative stability. The polymer composition of this membrane is based on the perflurosulfonic acid resin with long side chains.  The mechanical reinforcement is composed of poly ether ether ketone (also known as PEEK or PK) and it has the open mesh style.

Fumasep F-1075-PK is a colourless, transparent foil. The membrane is ready for use.

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-1075-PK Features:

 • Applications: Redox-Flow Battery, e.g. Vanadium-Redox-Flow Battery (VRB), using aqueous acidic conditions.
 • Cation Exchange Membrane (CEM)
 • Thickness: 75 micrometers (2.95 mil)
 • Size: 20cm x 30cm

This membrane is not suitable for standard PEM electrolysis applications.

Fumasep F-1075-PK Technical Specification Sheet


Keep membrane package closed / sealed when unused. 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 dry form and H 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, pre-treatment or before proceeding, 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.

Membrane Properties
Membrane Cation Exchange Membrane
Thickness 70 - 80 µm (microns)
Appearance / Color Transparent / Colorless
Backing Foil Between Paper
Delivery Form Dry
Reinforcement PK
Counter Ion H-form
Density 13 - 14 mg•cm-2
Specific Area Resistance 0.15 (in 0.5 M H2SO4) Ω•cm2
Specific Conductivity 0.5 - 0.6 (in 0.5 M H2SO4) mS•cm-1
Selectivity > 97 %
Proton Transfer Rate > 8000 µmol•min-1•cm-2
Ion Exchange Capacity 0.8 - 0.9 meq•g-1
Dimensional Swelling in H2O at 25°C 0 in 2M H2SO4 and 0 in vanadyl sulfate %
Uptake in H2O at 25°C 10 - 15 in 2M H2SO4 and 7 - 10 in vanadyl sulfate wt %
Non-Std Modulus (MPa) 400 - 450 MPa
Tensile Strength - max. (MPa) 40 - 45 MPa
Elongation to Break (%) > 30 %
Bubble Point Test in Water at 25°C > 3 bar

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