Fumasep FAA-3-20

Brand: FuMA-Tech
Product Code: 5041688


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Fumasep FAA-3-20 is a non-reinforced Anion Exchange Membrane (AEM) with very low resistance, high selectivity and high stability in pH acidic and basic environment.

Fumasep FAA-3-20 membrane comes in a 20cm x 30cm size sheet. The membrane is delivered in dry form and is the thin brown 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.

Fumasep FAA-3-20 Features:

 • Applications: Alkaline fuel cells without KOH or at low KOH concentration and relative application.
 • Anion Exchange Membrane (AEM)
 • Stability Range for pH: 1 - 12 at 25 - 50°C
 • Thickness: 18 - 22 micrometers (0.709 - 0.866 mil)
 • Size: 20cm x 30cm

Fumasep FAA-3-20 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.


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 ca. 100 ppm biocide (NaN3) to avoid biological fouling.

Pre-Treatment and Conditioning:

The membrane is delivered in bromide 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 T = 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, pre-treatment or before proceeding, please feel free to contact us for further information.

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

Membrane Properties
Membrane Anion Exchange Membrane
Thickness 18 - 22 µm (microns)
Appearance / Color Transparent / Light Brown
Backing Foil PET Foil
Delivery Form Dry
Reinforcement None
Specific Area Resistance < 2.0 (in Cl- form) Ω•cm2
Specific Conductivity > 5 mS•cm-1
Ion Exchange Capacity 1.65 - 1.85 mmol•g-1
Selectivity > 90 %
Uptake in H2O at 25°C 7 wt %
Dimensional Swelling in H2O at 25°C < 2 %
pH Stability Range at 25°C 1 - 12 pH

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