Heterogeneous Ion-Exchange Membranes are characterized by the discontinuous phase of the ion-exchange material. Heterogeneous Ion-Exchange Membranes have relatively high electrical resistance. Heterogeneous ion-exchange membranes are synthesized by solution casting techniques using polyvinyl chloride. These membranes are suitable for application in electro-membrane processes like electro-deionization, reverse osmosis or membrane electrolysis, which are used for water treatment. Heterogeneous ion exchange membranes are widely used in electro dialysis. These membranes are prepared from ion exchange resins and a film-forming polymer.