Fumapem FAA-3-50

Brand: FuMA-Tech
Product Code: 5041622

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Fumapem FAA-3-50 is a non-reinforced Anion Exchange Membrane (AEM) with very low resistance, high selectivity, and high stability in acidic and caustic environment.

Fumapem FAA-3-50 membrane comes in either a 10cm x 10cm or 20cm x 30cm size sheet. The membrane (brown foil) is delivered on a carrier foil (colourless rigid PET foil). Pull off carefully the membrane (brown) from the backing foil before pretreatment and further processing.

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.

Fumapem FAA-3-50 Features:

 • Applications: Alkaline fuel cell applying H2 and O2, also without aqueous KOH, electrolysis and other electrochemical applications (e.g. electrodialysis for demineralisation, desalination, acid recovery) requiring anion exchange membrane with low area resistance.
 • Anion Exchange Membrane (AEM)
 • Thickness: 45 - 50 micrometers (1.77 - 1.97 mil)
 • Sizes: 10cm x 10cm, 20cm x 30cm

Fumapem FAA-3-50 Technical Specification Sheet


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.

Pre-Treatment and Conditioning:

The membrane is delivered in bromide form (Br-) and dry form. For alkaline fuel cell / electrolysis applications, the membrane must be converted into OH-form by treating it with 0.5 – 1.0 M NaOH or KOH solution: Put the membrane sample in an aqueous solution of 0.5 – 1.0 M NaOH or KOH for at least 24 h at 20°C – 30°C. After rinsing with demineralised water (pH ~ 7) the membrane is readyto- use. Use closed container to avoid CO2 contamination (carbonate formation that may affect conductivity). The membrane in OH-form must be stored under wet / humidified and CO2-free conditions, avoid drying out of the membrane in OH-form. Long-term storage in dry conditions should be preferably done in carbonate, Cl- or Br-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.

Please note that a current lead time of one to two weeks is to be expected.

Membrane Properties
Membrane Anion Exchange Membrane
Thickness 45 - 50 µm (microns)
Appearance / Color Transparent / Brown
Backing Foil PET
Delivery Form Dry
Reinforcement None
Specific Area Resistance 0.6 in Cl- / Br- form and 0.10 - 0.15 in OH- form Ω•cm2
Specific Conductivity 7.8 in Cl- / Br- form and 40 - 45 in OH- form mS•cm-1
Counter Ion Bromide (Br-)
Ion Exchange Capacity 2.02 (in Cl- / Br- form) meq•g-1
Selectivity 95.5 (in Cl- / Br- form) %
Uptake in H2O at 25°C 23 in Cl- / Br- form and 40 in OH- form wt %
Dimensional Swelling in H2O at 25°C 2 in Cl- / Br- form and 17 in OH- form %

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