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Material Testing

Membranes and other components of the modules are steadily characterized in our lab.

The measurements are performed on original materials from customer and

can be combined with accelerated ageing or anther treatment.

You can send us material samples for analysis and shortly after get a confidential test-report.

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Listed below are characteristics measured using established methods.

For testing other parameters, developing a specific measurement procedure, leasing

or purchasing the test equipment please send a request.

Ion-Exchange Membranes

BM-Test.png

Recording impedance spactra and current-voltage curves of bipolar membranes

• Area resistance; conductivity (through plane)
• Permselectivity to counter-ions
• Impedance and current-voltage curves of bipolar membranes
• Electrochemical characteristics of a membrane or a
Membrane-Electrode Assembly at different temparatures and humidities
• Water uptake
• Ion-Exchange Capacity
• Expansion (by swelling, transfer of ionic form, or change of con-
centration and temperature)

• Water permeability (pressure gradient)

• Diffusion permeability (concentration gradient)

• Thickness

• Mullen Burst Test
• Stress-strain test (wet, or dry)

Measuring permselectivity of
ion-exchange membranes

Permselectivity-Test-Cell.png

also applicable to other dense membranes

also applicable to other flat sheet materials, incl. porous membranes and non-permeable films

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Dense membranes and gaskets

Monosphere ion-exchange resin beads in light microscope

• Gas parmermeability (pressure gradient). Examples:

    - Hydrogen permeability of flat-sheet gasket material at different temperatures and hymidities to
       evaluate suitability for sealing

    - Air permeability of dense membranes (integrity test)
 

Ion-Exchange Resins

• Electrical conductivity of ion-exchange resin bed at different compressions
• Ion-Exchange Capacity
• Selectivity
• Density of powdered ion-exchange resins

Measuring conductivity of
ion-exchange resins

Spacers

Integrated Spacers.png

Integrated spacers for measuring mass transfer 

• Mass transfer coefficient in a spacer filled channel

• Pressure lost in a spacer-filled channel
• Void fraction of a spacer net

Extruded spacer net in light microscope

General characterization of plastics and other materials

TOC-Analyser

• Total Organic Carbon (TOC) analysis in solid and liquid samples
(e.g. water after membrane extraction test)

• Scanning Electron Microscopy (SEM)

coupled with Energy Dispersive X-Ray Analysis (EDX)

for detection of metals on the surface
• Light- and UV-microscope
• Termogravimetric analysis (TGA) coupled with

Fourier-transform infrared spectroscopy (FTIR)

to characterize a material's thermal stability

SEM imaging a cross-section of a heterogeneous
ion-exchange membrane

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