Ion exchange membranes have ionic permselectivity and are classified into cation exchange membranes and anion exchange membranes.
Since negative-charged groups are fixed to cation exchange membrane, anions are rejected by the negative charge and cannot permeate through the cation exchange membrane (Figure 1-1). This is because cation exchange membranes are only permeable by cations. The anion exchange membranes perform the opposite way compared to cation exchange membranes (Figure 1-2). These selective permeations are carried out by DC current at an electorodialyzer.

Similar behavior happens in ion exchange resin. The ion exchange resin is in the granular form and performs as adsorptive exchange of ions (Figure 2). But it requires regeneration when adsorptive capacity is consumed. On the contrary, as the ion exchange membrane allows ions to permeate by DC electric current, no regeneration is required and allows for continuous use for an extended period of time.

NEOSEPTA has excellent characteristics as shown below.

Standard-grade…Used for general concentration and desalination.

Special-grade…We have various membranes with specific characteristics such as selective permeability for monovalent ions, chemical stability, etc.

To maximize the performance of NEOSEPTA, please read the following instructions.

Keep the NEOSEPTA wet and never let it become dry.

To prevent damage and deterioration of the membrane, avoid folding or contact with foreign substances.

When storing, be sure to keep the NEOSEPTA in a dark and cool place to avoid drying.

Prevent the membrane from contacting solutions containing oil, oxidizing agents, and/or polymer electrolyte (surfactant, etc.).