Nafion™ membranes are often used to separate the anodes from cathodes in electrolysis reactors or fuel cells. The thickness of the cation exchange membrane makes Nafion™ 115 ideal for methanol fuel cells (DMFC). Nafion™ 115 is 127 μm thick.

Chemours^® (formerly DuPont^®) Nafion™ 115 membranes are unreinforced films based on chemically stabilized perfluorosulfonic acid / PTFE copolymer in its acid form (H⁺). The physical properties remain the same for the chemically stabilized membranes. Compared to the unstabilized polymer, these have a much lower fluoride ion release. This means improved chemical resistance. Nafion™ PFSA membranes are widely used for proton exchange membrane (PEM) in fuel cells and electrolysis reactors. The membrane acts as a separator and solid electrolyte in a variety of electrochemical cells. Typically, such cells require that the membrane selectively carry cations across the cell boundary. The polymer is chemically resistant and durable.

Membrane Properties
Thickness	127 microns (5 mil)
Weight (g / m²)	250
Tensile Strenght - max. (MPa)	43 (6.2) in MD, 32 (4.6) in TD - method: ASTM D 882
Non-Standard-Module (MPa)	249 (36) - method: ASTM D 882
Elongation at Break (%)	225 (MD), 310 (TD) - method: ASTM D 882
Tear Strength - Start (g / mm)	6000 (MD, TD) - method: ASTM D 1004
Tear Strength - Proliferation (g / mm)	> 100 (MD), > 150 (TD) - method: ASTM D 1922
Specific Weight (23 °C, 50% RH)	1,98
Available Acid Capacity (meq / g)	0.90 min
Total Acid Capacity (meq / g)	0.95 bis 1.01
Conductivity (S/cm)	0.10
Membranolytic Properties
Water Content (% Water)	5.0 - method: ASTM D 570
Swelling (% Water)	38.0 - method: ASTM D 570
Linear Expansion % Increase - 50% RH, 23 °C	10.0 - method: ASTM D 756
Linear Expansion % Increase - 50% RH, 23 °C to 100 °C	15.0 - method: ASTM D 756