Fumasep FAA-3-30

Brand: FuMA-Tech
Product Code: 34010066

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Fumasep FAA-3-30 is an anion-exchange membrane, non-reinforced with low resistance, high selectivity, high mechanical stability, and high stability in pH acidic and basic environment. The polymer backbone for this membrane is based on a proprietary hydrocarbon resin.

Fumasep FAA-3-30 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 FAA-3-30 Features:

• Applications: Organic Redox-Flow applications or organometallic charged bearer.
• Anion Exchange Membrane
• Stability range: pH = 1 – 12 at T = 25 – 50 °C.
• Thickness (dry): 26 – 34 micrometers (1.02 - 1.33 mil)
• Sizes: 10cm x 10cm, 20cm x 30cm

Fumasep FAA-3-30 Technical Specification Sheet


The membrane is the thin brown foil, delivered on a backing foil (colorless rigid PET foil). Carefully separate the membrane (brown) from the backing foil. The membrane is delivered in dry form.


Keep membrane package closed / sealed when unused. Unpack membrane only for direct use and process it immediately after opening. 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 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 additional sodium sulfite (Na2SO3) in concetration 1 – 3 wt% 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 four to six weeks is to be expected.

Membrane Properties
Membrane Anion Exchange Membrane
Thickness 26 – 34 µm (microns)
Appearance / Color Brown, Transparent
Backing Foil on PET
Reinforcement None
Specific Conductivity > 5 mS cm^-1 (Cl^-1 form)
Selectivity > 90 % (0.1 / 0.5 mol/kg KCl at T = 25 °C)
Ion Exchange Capacity 1.67 – 2.04 mmol g^-1
Dimensional Swelling in H2O at 25°C < 2 %
Uptake in H2O at 25°C < 19 wt %

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