FS-930 Cation Exchange Membrane

The FS-930 is a fluorinated cation exchange membrane delivering some of the lowest ohmic losses in the Fumatech range, purpose-built for vanadium redox flow battery cells where proton conductivity governs round-trip efficiency. At just 25-35 µm, it combines sub-0.1 Ω cm² area resistance with better than 99% proton selectivity, minimizing both voltage loss and vanadium crossover in a single membrane. Supplied dry in H+ form on a PET backing, it installs directly into standard or stacked VRFB hardware.

• Near-Zero Resistance: <0.1 Ω cm² area resistance in 0.5 M H2SO4 minimizes voltage loss at high current density.
• Exceptional Selectivity: >99% proton selectivity limits vanadium crossover and preserves coulombic efficiency over cycling.
• Slim Profile: 25-35 µm thickness reduces cell resistance compared with thicker cation membranes in the range.
• Verified Mechanical Integrity: Burst test >3 bar confirms reliable performance under normal operating pressures.
• Simple Assembly: Delivered dry and ready for direct installation, with rinse-only preparation if extra cleaning is needed.
• Flexible Cut Options: Standard sheets or pre-cut for Redox Flow’s X-Stack, S-Stack, and 3-compartment X-Cell hardware.