Fumapem F-950

Brand: FuMA-Tech
Product Code: 5041651

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Fumapem F-950 membrane is a Long Side Chain - Per-Fluorinated Sulfonic Acid (LSC-PFSA) cation exchange membrane (CEM) with low resistance, high mechanical stability, high selectivity and high chemical / oxidative stability.

Fumapem F-950 is a thin longside-chain non-reinforced membrane that is designed for use in stationary hydrogen PEM fuel cell applications.

Fumapem F-950 membrane comes in either a 10cm x 10cm or 20cm x 30cm size sheet.

Fumatech membranes are highly sensitive to differences in humidity and moisture content. Therefore the membranes can vary +/- 0.5cm from the original cut sizes. Also due to this sensitivity the manufacturer expects wrinkles to form, however soaking the membranes in deionized water will return the membranes to the full size planar state according to the manufacturer.

Fumapem F-950 Features:

• Applications: Designed for Portable Proton Exchange Membrane Fuel Cell applications.
• Cation Exchange Membrane
• Equivalent Weight of 950 (g/eq)
• Long Side Chain - Per-Fluorinated Sulfonic Acid (LSC-PFSA)
• Thickness: 50 micrometers (1.97 mil)
• Sizes: 10cm x 10cm, 20cm x 30cm

Fumapem F-950 Technical Specification Sheet


The membrane is the colorless, transparent foil, delivered on a backing layer (colourless rigid PET foil). Pull off carefully the membrane from the backing foil. Before use the membrane must be activated.


Keep membrane package closed / sealed when unused. Unpack membrane only for direct use and process immediately after opening. Store, handle and process the membrane in a clean and dust-free area. Use only new and sharp knives or blades, when cutting the membrane. Always wear protective gloves when handling the membrane. Handle with care, be sure not to puncture, crease or scratch the membrane, otherwise leaks will occur. All surfaces in contact with the membrane during handling, inspection, storage and mounting must be smooth and free of sharp projections.

Membranes will expand and contract based on water / electrolyte content. To eliminate wrinkling, it is necessary to expand membranes before mounting by pretreatment.

Pre-Treatment and Conditioning:

The membrane is delivered in H-form and dry form (non-activated). For optimum performance and lowest resistance it is necessary to pretreat the membrane according to the following prescription: Put the membrane sample in an aqueous 10 wt% HNO3 solution or in 5 vol % H2SO4 solution at minimum 80°C for at least 12 hours. After rinsing with demineralized water (pH ~ 7) the membrane is ready for use (activated). Membranes will expand and contract based on moisture content.

Long Term Storage:

The membrane can be stored dry for an unlimited amount of time. However, the membrane has to be conditioned (washed and rinsed) prior to use.

Please note that a current lead time of one to two weeks is to be expected.

Membrane Properties
Membrane Cation Exchange Membrane
Thickness 44 - 49 µm (microns)
Thickness (Wet) 47 - 55 µm (microns)
Appearance / Color Transparent / Colorless
Backing Foil PET Foil
Delivery Form Dry (non-activated)
Reinforcement None
Tensile Strength - max. (MPa) 30 - 35 MPa
Density 9.5 - 9.6 mg•cm-2
Equivalent Weight (EW) 950 g/eq
Non-Std Modulus (MPa) 500 – 550 MPa
Yield Strength at 23°C / 50 % R.H. 13 - 17 MPa
Elongation to Break (%) 125 - 160 %
Specific Area Resistance 0.44 (in H2O at 25°C in H-form) Ω•cm2
Specific Conductivity 11.3 (in H2O at 25°C in H-form) mS•cm-1
Counter Ion H-form
Ion Exchange Capacity 0.95 (in H2O at 25°C in H-form) meq•g-1
Selectivity 93 - 94 %
Uptake in H2O at 25°C 23 (in H-form) wt %
Dimensional Swelling in H2O at 25°C 12 - 14 (in H-form) %
Proton Transfer Rate > 10,000 µmol•min-1•cm-2
Bubble Point Test in Water at 25°C > 3 bar

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