Customer & product inquiries: 1-800-424-7833 | All other inquiries: 610-423-4300
Visit our Blog

Fluorinated ion exchange membrane

FLEMION Fluorinated Ion Exchange Membrane

FLEMION® is a fluorinated ion exchange membrane used to produce caustic soda/caustic potash in electrolysis plants. FLEMION membranes achieve substantial energy savings because they require less electrical current to decompose the purified brine. In addition to saving energy, FLEMION membranes minimize the influence of brine impurities and enable manufacturers to maintain 97-98% electrical current efficiency.

Used in salt electrolysis plants in over 50 countries all over the world

FLEMION is used in the electrolyzers at electrolysis plants that decompose brine. It plays a key part in manufacturing caustic soda (sodium hydroxide)/caustic potash (potassium hydroxide), chlorine, and hydrogen-basic chemical products. These chemicals are key ingredients of many products used in our daily lives.

For more than 40 years, AGC has worked to reduce the electric resistance of fluorinated ion exchange membranes. Our flagship product F-8080 is a fluorinated cation exchange membrane that is preferred by many customers because it offers extremely low resistance.


  • Energy savings from low electric resistance
    FLEMION fluorinated ion exchange membranes require low voltage at high DC current to decompose brine in an electrolyzer. Chlorine is generated at the anode, while sodium hydroxide (also called caustic soda) and hydrogen are generated at the cathode. Oxidation at the anode occurs simultaneously with reduction at the cathode, which makes current flow. The amount of energy consumed is a product of the voltage and current applied to the low power consumption results from the low resistance of the membrane.

  • High current efficiency
    The electrical current efficiency is the ratio of the actual mass of a substance liberated from an electrolyte by the passage of current to the theoretical mass liberated according to Faraday's law. It is usually expressed as a percentage. A small part of hydroxide ions (OH-) generated on the cathode (negative side) of the electrolyzer passes through the cation exchange membrane to the anode side and cannot be collected as products. Reducing this part as much as possible increases the current efficiency. Our fluorinated cation exchange membrane for salt electrolysis has a carboxylic polymer layer which makes high electrical current efficiency. This fluorinated carboxylic polymer was developed by AGC to industrialize the membrane process of salt electrolysis. Now it is possible to keep electrical current efficiency 97% to 98% continuously.

  • Stable performance due to less impurity influence
    The brine used for electrolysis includes impurities such as Ca and Mg that can negatively affect the performance of the membrane. For example, Ca reduces current efficiency while Mg increases voltage. FLEMION fluorinated ion exchange membranes minimize the influence of these impurities, enabling them to perform and remain stable longer.