BRANION-50 AEM 50-micron anionic membrane

Branion® AEM 50

Branion® AEM 50 is a 50 µm, non-reinforced anion exchange membrane (AEM) designed for low-resistance alkaline electrochemical applications. Its proprietary hydrocarbon polymer backbone provides high hydroxide-ion conductivity, mechanical stability and chemical resistance to common solvents.

Key features

• 50 µm nominal thickness for low membrane resistance.
• Non-reinforced construction.
• OH⁻ conductivity greater than 60 mS/cm at 20 °C and 160 mS/cm at 80 °C.
• Tensile strength greater than 45 MPa.
• Dimensional expansion below 10% in 1 M KOH at 80 °C.
• Excellent chemical stability in acidic and basic environments.
• Strong resistance to alcohols and ketones, including ethanol, isopropanol, acetone and butanol.
• Polymer decomposition temperature above 250 °C.
• Ion exchange capacity (IEC): approximately 2.8 meq/g.

Applications

Suitable for research and development of AEM water electrolyzers, alkaline electrochemical cells, hydroxide-ion conducting electrochemical systems and other applications requiring a chemically stable anion exchange membrane.

Handling and storage

Supplied dry between a backing and cover foil. For long-term storage, keep sealed in the original packaging with minimal exposure to heat and light. It may also be stored wet in water or aqueous electrolytes such as KOH. For hydroxide-ion conducting applications, convert the membrane to its OH⁻ form before use. NovaMea recommends soaking it in 1 M KOH or NaOH at 80 °C, replacing the solution every hour for three cycles. After ion exchange, minimize exposure to ambient air because CO₂ can convert the OH⁻ form to bicarbonate. Handle with clean protective gloves in a clean, dust-free environment.