Fumasep FAAM-40

Brand: FuMA-Tech
Product Code: 5041714

From $27.00

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Fumasep FAAM-40 is an anion-exchange membrane - non-reinforced with low resistance, high selectivity, and high stability in acidic and caustic environment. The polymer backbone for this membrane is based on a proprietary hydrocarbon resin.

Fumasep FAAM-40 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 FAAM-40 Features:

• Applications: Alkaline electrolysis using liquid aqueous KOH (6 - 12 M KOH), preferentially at both, anode and cathode side.
• Anion Exchange Membrane
• Operation Range: 6 - 12 M KOH, temperature RT - 100 °C.
• Thickness (dry): 37 - 43 micrometers (1.45 - 1.69 mil)
• Sizes: 10cm x 10cm, 20cm x 30cm

Fumasep FAAM-40 Technical Specification Sheet


The membrane is the thin brown foil, delivered on a backing foil (colourless rigid PET foil). Pull off carefully the membrane (brown) from the backing foil. The membrane is delivered in dry form.


Keep membrane package closed / sealed when unused. 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.

Pre-Treatment and Conditioning:

No specific pretreatment required. The membrane is self-activating in the cell after contact with aqueous caustic electrolyte (e.g. 9 M aqueous KOH solution) within several hours.

Depending on cell design, activation may also be done before assembling: Put the membrane sample between stabilizing meshes (in order to avoid curling) in aqueous KOH solution (concentration according to application) for at least 24 hrs at room temperature. Use closed container to avoid CO2 contamination (carbonate formation that may affect conductivity). Membranes must be covered by KOH solution. Membranes will expand when subject to swelling process. The hydration level can be controlled by KOH concentration and temperature, e.g. 9 M KOH solution at room temperature leads to approx. 50 - 70 wt% hydration level.

If you have any concerns about storage, chemical stability, pre-treatment or before proceeding, please feel free to contact us for further information.

Please note that a current lead time of four to six weeks is to be expected.

Membrane Properties
Membrane Anion Exchange Membrane
Thickness 37 - 43 µm (microns)
Appearance / Color Brown, Transparent
Backing Foil on PET
Delivery Form Dry
Reinforcement None
Young’s modulus at 23 °C / 50 % r.h. > 1000 MPa
Temperature durability (dry) No oxidation below 250 °C
pH durability range stable under highly alkaline conditions
Pressure operation Not tested above 1 bar difference
Thickness Increase 25 – 40% (treatment with 12 M aqueous KOH at 20 °C for 1 day)
Length Increase 0 - 2% (treatment with 12 M aqueous KOH at 20 °C for 1 day)
Swelling (hydration) 40 - 60 wt% (treatment with 12 M aqueous KOH at 20 °C for 1 day)
Counter Ion None

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