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Properties of Nafion® PFSA Membrane A. Thickness and Basis Weight Properties1 Membrane Type NR-211 NR-212 B. Physical Properties Property2 Physical Properties - measured at 50% RH, 23 °C Basis Weight (g/m2) 50 100 Test Method ASTM D 882 ASTM D 882 ASTM D 882 Test Method DuPont DuPont NAE305 DuPont NAE305 DuPont Test Method ASTM D 570 ASTM D 570 ASTM D 756 ASTM D 756 Typical Thickness (micrometer) 25.4 50.8 Typical Values NR-211 NR-212 MD TD MD TD 32 251 352 NR-212 1.97 0.92 min. 0.95 to 1.01 < 0.010 Typical Value 5.0 ± 3.0% 50.0 ± 5.0% 10 15 Tensile Strength, max., MPa 23 Non-Std Modulus, MPa 288 Elongation to Break, % 252 C. Other Properties Property Specific Gravity1 Available Acid Capacity3 meq/g Total Acid Capacity4 meq/g Hydrogen Crossover5, (ml/min·cm2) D. Hydrolytic Properties Property Hydrolytic Properties Water content, % water6 Water uptake, % water7 Linear expansion, % increase8 28 281 311 NR-211 1.97 0.92 min. 0.95 to 1.01 < 0.020 32 266 343 from 50% RH, 23 °C to water soaked, 23 °C from 50% RH, 23 °C to water soaked, 100 °C 1 Measurements taken with membrane conditioned to 23 °C, 50% RH. 2 Where specified, MD - machine direction, TD - transverse direction. Condition state of membrane given. 3 A base titration procedure measures the equivalents of sulfonic acid in the polymer, and used the measurements to calculate the available acid capacity of the membrane (acid form). 4 A base titration procedure measures the equivalents of sulfonic acid in the polymer, and used the measurements to calculate the total acid capacity or equivalent weight of the membrane (acid form). 5 Hydrogen crossover measured at 22 °C, 100% RH and 50-psi delta pressure. This is not a routine test. 6 Water content of membrane conditioned to 23 °C and 50% RH (dry weight basis). 7 Water uptake from dry membrane to conditioned in water at 100 °C for 1 hour (dry weight basis). 8 Average of MD and TD. MD expansion is similar to TD expansion for NR membranes.PDF Image | DuPont Nafion PFSA NR-211 and NR-212 membranes
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