Fumasep FKD-PK-75 is a PK reinforced Cation Exchange Membrane (CEM) with low resistance, high selectivity, high mechanical stability, and high stability in caustic environment. The polymer backbone of this membrane is based on a proprietary hydrocarbon resin. The mechanical reinforcement is composed of poly ether ether ketone (also known as PEEK or PK) and it has the open mesh style.

Fumasep FKD-PK-75 membrane comes in either a 10cm x 10cm or 20cm x 30cm size sheet. The membrane is the light brown foil delivered in dry form.

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 FKD-PK-75 Features:

• Applications: Diffusion dialysis for caustic solutions.
• Cation Exchange Membrane
• Stability range (pH) at 25 ºC: 1 - 14
• Thickness: 75 micrometers (2.91 mil)
• Size: 10cm x 10cm, 20cm x 30cm

Fumasep FKD-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:

Storage for short and medium time scale (hours up to several weeks) may be done in unsealed containers in 0.5 - 2 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 biocide to avoid biological fouling.

Pre-Treatment and Conditioning:

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

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

Membrane Properties
Membrane	Cation Exchange Membrane
Thickness	70 - 80 µm (microns)
Appearance / Color	Transparent / Brown
Backing Foil	None
Delivery Form	Wet (2 wt% NaCl solution)
Reinforcement	PEEK (PK)
Counter Ion	Sodium Form (Na+)
Density	9 - 10 mg•cm-2
Specific Area Resistance	1.5 - 2.0 (in Na+ form) Ω•cm2
Specific Conductivity	4 - 5 (in Na+ form) mS•cm-1
Selectivity	96 - 99 %
Hydroxyl Transfer Rate	300 - 600 µmol•min-1•cm-2
Ion Exchange Capacity	1.4 - 1.6 (in Na+ form) meq•g-1
Dimensional Swelling in H2O at 25°C	0 - 1 %
Uptake in H2O at 25°C	20 - 30 wt %
Non-Std Modulus (MPa)	2000 - 2500 MPa
Tensile Strength - max. (MPa)	> 50 MPa
Yield Strength at 23°C / 50 % R.H.	30 - 40 MPa
Elongation to Break (%)	> 15 %
Bubble Point Test in Water at 25°C	> 2.5 bar
Residual Solvent / Additive Content	< 3 %