Untreated Nafion™ 212 is 50.8 micrometers (2 mil) thick. The membrane is positioned between a backing film and a coversheet.
Chemours' Nafion™ 212 membranes are based on chemically stabilized perfluorosulfonic acid/PTFE copolymer in the acid (H+) form, and exhibit substantially lower fluoride ion release compared to the non-stabilized polymer – a sign of improved chemical durability. Nafion™ PFSA membranes are widely used for Proton Exchange Membrane (PEM) fuel cells and water electrolyzers. The membrane performs as a separator and solid electrolyte in a variety of electrochemical cells that require the membrane to selectively transport cations across the cell junction. The polymer is chemically resistant and durable.
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|Thickness||50.8 micrometers (2 mil)|
|Basic Weight (g/m²)||100|
|Tensile Strength - max. (MPa)||32 (MD), 32 (TD) - Method: ASTM D 882|
|Non-Std Modulus (MPa)||266 (MD), 251 (TD) - Method: ASTM D 882|
|Elongation to Break (%)||343 (MD), 352 (TD) - Method: ASTM D 882|
|Hydrogen Crossover (ml/min·cm²)||< 0.010|
|Specific Gravity (23 °C, 50% RH)||1.97|
|Available Acid Capacity (meq/g)||0.92 min.|
|Total Acid Capacity (meq/g)||0.95 to 1.01|
|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||10 - Method: ASTM D 570|
|Linear Expansion % increase - 50% RH, 23°C to water soaked 100°C||15 - Method: ASTM D 570|