Fumapem AP-40 - PBI Copolymer

Brand: FuMA-Tech
Product Code: 5041708

From $25.00

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Fumapem AP-40 is a non-reinforced Polybenzimidazole Copolymer membrane designed for use in High-temperature PEM fuel cell (HT-PEMFC).

Fumapem AP-40 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 AP-40 Features:

• Applications: High-temperature PEM fuel cell (HT-PEMFC). Reformat system.
• PBI Copolymer
• Thickness (dry): 35 – 45 micrometers (1.37 - 1.77 mil)
• Sizes: 10cm x 10cm, 20cm x 30cm

Fumapem AP-40 Technical Specification Sheet


The membrane is the brown foil delivered in dry form.


Keep membrane package closed / sealed when unused. 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.

Doping with Phosphoric Acid

A general non-binding recommendation: Put the membrane sample in 85 wt % H3PO4 at temperatures between T = 120 °C and 140 °C for at least 3 hours at target temperature. The setting of parameters for doping procedure can vary from device to device and it is solely responsibility of the user. Membranes must be soaked completely in phosphoric acid. Membranes will expand when during the doping process. The recommended doping level (= gain of weight based of dry weight) is between 300% and 350 %.

If you have any concerns about storage, chemical stability, and pre-treatment please feel free to contact us for further information.

Remark: Fuel Cell Store bears no responsibility for applied doping procedure.

Please note that a current lead time of four to six weeks is to be expected.

Membrane Properties
Membrane PBI Copolymer
Thickness 35 – 45 µm (microns)
Appearance / Color Brown, Transparent
Backing Foil None
Reinforcement None
Weight Per Unit Area 4.8 - 6.4 mg cm2
Residual Solvent / Additive Content < 10 %

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