This product, the DuPont Nafion 211 proton exchange membrane, is designed for use as an electrolyte membrane in hydrogen fuel cells, electrolysis cells, and electrochemical sensors. It features a thickness of 25.4 μm with an ion exchange capacity in the range of 0.95–1.01 meq/g, balancing proton conductivity and mechanical stability. Key mechanical properties include a tensile strength of 23 MPa in the machine direction and 28 MPa in the transverse direction, along with a high elongation at break of 252% MD, indicating good flexibility. The membrane has a water uptake of 50±5%, which supports reliable hydration during operation. Supplied with two protective layers, it can be used directly after removal or pre-treated as needed. This material is well-suited for research and experimental applications in energy materials and fuel cell development.