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Please note that 20x30cm size is out of stock and not expected to arrive until December 2023.
Fumasep FKS-30 is a non-reinforced Cation Exchange Membrane (CEM) with very low resistance, high selectivity and high stability in pH acidic and basic environment. The polymer backbone for this membrane is based on a proprietary hydrocarbon resin.
Fumasep FKS-30 membrane comes in either a 10cm x 10cm or 20cm x 30cm size sheet. The membrane is the thin, slightly brown foil, delivered on a backing foil (colourless rigid PET foil). Pull off carefully the membrane (brown) from the backing foil.
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.
• Applications: Electrodialysis for demineralisation, desalination, acid recovery applications and others.
• Cation Exchange Membrane
• Stability range (pH) at 25 ºC: 1 - 14
• Thickness: 30 micrometers (1.19 mil)
• Sizes: 10cm x 10cm, 20cm x 30cm
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. 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 which may get into contact with the membrane during inspection, storage, pretreatment and mounting must be free of sharp edges or angles.
Dry Form: 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.
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 ca. 100 ppm biocide (NaN3) to avoid biological fouling.
The membrane is delivered in H+ form and dry form. Depending on application and cell design,assembling is possible in dry form (without pretreatment) or wet form. Before assembling in wet form put the membrane sample between stabilizing meshes / spacers (in order to avoid curling) in NaCl solution - e.g. 0.5 M NaCl solution at 25°C for 72 hrs exchanging the solution several times. Do not let the membrane dry out since micro-cracks may likely occur during shrinkage.
If you have any concerns about storage, chemical stability and pretreatment before proceeding, please feel free to contact us for further information.
|Membrane||Cation Exchange Membrane|
|Thickness||21 - 26 µm (microns)|
|Appearance / Color||Slightly Brown|
|Backing Foil||PET Foil|
|Tensile Strength - max. (MPa)||46 - 66 MPa|
|Density||4.0 - 4.2 mg•cm-2|
|Non-Std Modulus (MPa)||2030 - 2480 MPa|
|Yield Strength at 23°C / 50 % R.H.||46 - 60 MPa|
|Elongation to Break (%)||128 - 190 %|
|Specific Area Resistance||0.84 (in Na+ form) Ω•cm2|
|Specific Conductivity||3.9 (in Na+ form) mS•cm-1|
|Ion Exchange Capacity||1.43 (in Na+ form) meq•g-1|
|Uptake in H2O at 25°C||22 wt %|
|Dimensional Swelling in H2O at 25°C||0 %|
|Hydroxyl Transfer Rate||120 - 130 µmol•min-1•cm-2|
|Bubble Point Test in Water at 25°C||> 3 bar|
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