Cation-Exchange Membrane (Fumasep, F Series) for Redox Flow Battery and Electrolyzer, CRFBECEMF
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The Fumasep F-series (produced by Fumatech BWT) comprises a broad range of high-performance cation exchange membranes (CEMs). While Nafion is the standard for acidic fuel cells, the Fumasep F-series is the "Swiss Army Knife" of CEMs, offering specialized grades for everything from vanadium redox flow batteries to large-scale industrial electrodialysis.
F-930-RFD (Reinforced Flow-battery Durability): This is a specialized, thin membrane designed for Redox Flow Batteries. It contains an internal reinforcement that allows it to be very thin (30 μm) for low ohmic loss while preventing the membrane from stretching or tearing under the weight of the electrolyte. It has an area resistance of < 0.21 Ω cm^2 in sulfuric acid, making it one of the most efficient VRFB separators.
F-1850 (The "Blend" Membrane): F-1850 membrane is mainly used in Direct Methanol Fuel Cells (DMFC) and flow batteries. It is a non-reinforced "blend" membrane (50 μm). It is specifically formulated to have a higher "blocking" capability, meaning it prevents methanol or vanadium ions from crossing over more effectively than standard PFSA films of the same thickness.
F-10120 & F-10120-PK (The Electrolysis Workhorses): These are much thicker membranes (120 μm) designed for long-term industrial use. (1) F-10120: A standard, thick PFSA film. Its primary advantage is chlorine resistance and high oxidative stability, making it ideal for electrode protection in harsh chemical environments. (2) F-10120-PK: This version adds a Polyetheretherketone (PEEK/PK) woven mesh. This mesh makes the membrane virtually indestructible in a stack, allowing it to withstand high differential pressures between the hydrogen and oxygen sides in a water electrolyzer.
| Part Number | CRFBECEMF930 | CRFBECEMF1850 | CRFBECEMF10120 | CRFBECEMF10120PK |
| Name | F-930-RFD | F-1850 | F-10120 | F-10120-PK |
| Thickness (um) | 30 | 50 | 120 | 120 |
| Reinforcement | Yes (PE) | None (Self-supporting) | None (Self-supporting) | Yes (PEEK Mesh) |
| Area Resistance (Ω·cm²) | - | <0.3 | 0.79 | <0.8 |
| Tensile Strength (MPa) | >70 | >30 | 27-31 | >40 |
| Selectivity | - | >99% | 93-94% | >95% |
| Typical Use Case | Water Electrolysis & Redox Flow Battery | Vanadium Redox Flow Battery (VRFB), Direct Methanol Fuel Cells (DMFC) | Harsh Oxidative Electrochemistry | Chlorine Electrolysis & Oxidative Electrochemistry |
| Package Grade | 10cm * 10cm/pcs/pack | 10cm * 10cm/pcs/pack | 10cm * 10cm/pcs/pack | 10cm * 10cm/pcs/pack |
Use Note:
(1) F-930-RFD: Treated with 10 wt% H2SO4, 70-100 °C, 6 h and DI H2O rinsing.
(2) F-1850: Direct use with dry form.
(3) F-10120: Treated with 0.5 M NaCl，25°C，72h, and then several time refresh of soak solution.
(4) F-10120-PK: Direct use with dry form, or use acid treatment as F-930-RFD.