Nafion 212 (maker code NR212) is a thin perfluorosulfonic acid (PFSA) proton exchange membrane that conducts protons (H⁺) and other cations while separating the anode and cathode. It is solution-cast, nominally 50.8 µm (2 mil) thick, and supplied as a 100 × 100 mm sheet.
Thickness is a trade-off in the Nafion family: thin grades (212: 50.8 µm, 211: 25.4 µm) have lower resistance but are more delicate and allow more gas/fuel crossover; thick grades (115: 127 µm, 117: 183 µm) are more robust and limit crossover better, at higher ionic resistance. Nafion 212 is the balanced option among the thin membranes: clearly lower ionic resistance than 115 and 117, yet more robust and with lower hydrogen crossover than Nafion 211. It is a common thin-membrane choice for PEM fuel cell and electrolyzer MEA work.
| Membrane type | Proton (cation) exchange membrane, PFSA |
| Production method | Solution (dispersion) cast, NR series |
| Nominal thickness | 50.8 µm (2 mil) |
| Basis weight | 100 g/m² (manufacturer data) |
| Acid capacity | Available at least 0.92 meq/g; total 0.95–1.01 meq/g |
| Hydrogen crossover | < 0.010 mL/min·cm² (22 °C, 100% RH, 50 psi differential; manufacturer data) |
| Water uptake | 50 ± 5% (manufacturer data) |
| Wet expansion | Linear, about 10% (23 °C) – 15% (100 °C) |
| Tensile strength | 32 / 32 MPa (MD / TD, manufacturer data) |
| Operating temperature | Conductivity falls if it dries out above about 80 °C |
| Form | Acid (H⁺) form (manufacturer data) |
| Size | 100 × 100 mm |
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