Fumasep FKB-PK-75 is a PK-reinforced Cation Exchange Membrane (CEM) with low resistance, high selectivity, high mechanical stability, and high stability in pH-acidic and caustic environments. The polymer backbone for this membrane is based on a proprietary hydrocarbon resin.

Fumasep FKB-PK-75 membrane is optimized for electrodialysis and electrodialysis with bipolar membranes.

Fumasep FKB-PK-75 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 FKB-PK-75 Features:

• Applications: Designed for Electrodialysis and Bipolar Electrodialysis (as separator between feed and acid chamber).
• Cation Exchange Membrane
• Stability Range (pH) at 25°C: Stable under acidic and caustic conditions (pH = 1-14) (e.g. 4 M KOH).
• Thickness: ~60-90 micrometers (~2.36 - 3.54 mil)
• Sizes: 10cm x 10cm, 20cm x 30cm

Fumasep FKB-PK-75 Technical Specification Sheet

Handling:

Keep membrane package closed / sealed when unused. 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 in contact with the membrane during handling, inspection, storage and mounting must be smooth and free of sharp projections.

Storage:

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.

Pre-Treatment and Conditioning:

Before application or handling the FUMASEP© membranes, the membrane must be converted to wet state. During the swelling the physical, mechanical and electro-chemical properties of the membrane are changed and the membrane becomes ion‐conductive. Swelling causes dimensional changes. Once the membrane has reached its equilibrium state, it is ready for use. Standard conditioning of the FUMASEP© membrane is done in 0,5 – 1 M NaCl solution prepared with demineralized water at ambient temperature. The membrane is placed in to the solution and equilibrated for a defined period. During swelling, the membrane should be completely immersed.

If you have any concerns about application, storage, chemical stability, and pretreatment before proceeding, please feel free to contact us for further information.