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Nafion™ XL
Untreated Nafion™ XL at 27.5 micrometers (1.1 mil) thick.
Chemours' Nafion™ XL membrane is an extended-lifetime reinforced membrane based on chemically stabilized perfluorosulfonic acid/PTFE copolymer in the acid (H+) form. The reinforcement improves the membrane's handling and physical properties. When the reinforcement is combined with the chemically stabilized polymer, the membrane exhibits both substantially lower fluoride ion release and longer operating durability under fuel cell conditions.The membrane is positioned between a backing film and a cover-sheet.
View the Nafion™ product data sheets below for more information on each type:
| Properties | |
| Thickness | 27.5 micrometers (1.1 mil) |
| Basic Weight (g/m²) | 55 |
| Tensile Strength - max. (MPa) | 45 (MD), 40 (TD) - Method: ASTM D 882 |
| Non-Std Modulus (MPa) | 613 (MD), 400 (TD) - Method: ASTM D 882 |
| Elongation to Break (%) | 200 (MD),185 (TD) - Method: ASTM D 882 |
| In-Plane Conductivity (mS/cm) | > 72.0 |
| Through-Plane Conductivity (mS/cm) | > 50.5 |
| Hydrogen Crossover (ml/min·cm²) | < 0.015 |
| Hydrolytic Properties | |
| Water content (% water) | 5.0 ± 3.0% - Method: ASTM D 570 |
| Water uptake (% water) | 50.0 ± 5.0% - Method: ASTM D 570 |
| Linear Expansion % increase - 50% RH, 23°C to water soaked 23°C | 1% (MD), 5% (TD) |
| Linear Expansion % increase - 50% RH, 23°C to water soaked 100°C | 3% (MD), 11% (TD) |
