Fumasep FKM-PP

Brand: FuMA-Tech
Product Code: 5041678

From $17.00

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Fumasep FKM-PP is a heterogeneous cation-exchange membrane - PP-reinforced with high selectivity and very high mechanical stability.

Fumasep FKM-PP 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 FKM-PP Features:

• Applications: Electrocoating, electroplating, electrodeionisation, electrodialysis for demineralisation, desalination
• Cation Exchange Membrane
• Stability Range: pH 1 - 10 at T = 25 °C
• Thickness (dry): 450 - 500 micrometers (17.71 - 19.69 mil)
• Sizes: 10cm x 10cm, 20cm x 30cm

Fumasep FKM-PP Technical Specification Sheet


The membrane is the brown foil delivered in dry form.


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.

Dry form: Storage for long time scale (> 12 month) may be done in dry state (sealed container). Wet form: Storage for short and medium time scale (hours up to several weeks) may be done in unsealed containers in 0.5 – 1.5 wt% NaCl solution or comparable neutral pH electrolytes. For storage over a longer time period a sealed container is recommended using afore said electrolyte with biocide to avoid biological fouling.


The membrane is delivered in Na form and dry form. Depending on application and cell design, assembling is possible in dry form (without pretreatment) or wet form. For optimum performance it is recommended to rinse the membrane in NaCl solution (e.g. 0.5 M NaCl solution at T = 25 °C for 24 hrs) to remove any additive from the membrane. Do not let the membrane dry out since micro-cracks may likely occur during shrinkage.

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 450 - 500 µm (microns)
Appearance / Color Brown
Backing Foil None
Delivery Form Dry
Reinforcement PP (polypropylene fabrics)
Specific Conductivity 1.7 - 2.0 mS•cm-1
Counter Ion Na+
Ion Exchange Capacity 1.6 meq•g-1
Selectivity 93 - 96 %
Uptake in H2O at 25°C 15 - 20 wt%
Weight Per Unit Area 44 - 52 mg cm2
Dimensional Swelling in H2O at 25°C 0 - 2 %
Hydroxyl Transfer Rate 50 μmol•min-1•cm-2
Bubble Point Test in Water at 25°C > 3 bar
pH Stability Range at 25°C 1 - 10 pH

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