General
Bipolar membranes (BPM) consist of an anion layer and a cation layer which are connected
by means of our patented method. On the borderline between these two layers water is splitted
into OH- and H+ ions when a reverse voltage over 0.83 V is applied. Thus, attention must be
given to the right poling. The cation-exchange layer must be directed towards the cathode, and
the anion-exchange layer must be towards the anode. If the membrane is used in the wrong
direction for a long period of time, the BPM’s structure may be absolutely destructed.
Handling and Storage
Please pay attention that the BPM’s surface is not contaminated with surface active agents
or will be damaged by any mechanical influence. High attention must be given to the right
poling when using the membranes! When mounting the membranes it is imperative that the
membrane sides will not get mixed up. Therefore, the cation layer is marked with the cut edge in
the upper right corner and the punching hole in the upper left side. This layer must be directed
towards the cathode. The BPM should be stored in 1 M NaCl solution and placed in a closed
container. If storage will be for a longer period of time 100 ppm of NaN3 should be added to
prevent the biological growth. The recommended working current is 50~100 mA /cm2 . If you
have any concerns before proceeding, please contact us for further information.
