Fumasep F-988-PTFE

Brand: FuMA-Tech
Product Code: 5041658

From $49.00

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Fumasep F-988-PTFE membrane is a per-flourinated sulfonic acid and carboxylate bilayer type cation exchange membrane - PTFE reinforced with surface modification on both sides. This membrane has low electrical resistance, high selectivity, very high mechanical stability, very high stability in basic and acidic environment and high hydroxyl blocking capability.

Fumasep F-988-PTFE 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.

Fumasep F-988-PTFE Features:

• Applications: Electrolysis applications for Sodium Chloride, Sodium Chromate, and Ammonium Persulfate
• Cation Exchange Membrane
• Thickness: 270 - 280 micrometers (10.63 - 11.02 mil)
• Sizes: 10cm x 10cm, 20cm x 30cm

Fumasep F-988-PTFE Technical Specification Sheet


The membrane is the white foil delivered in dry form.


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.

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 which may get into contact with the membrane during inspection, storage, pretreatment and mounting must be free of sharp edges or angles. To control and minimise wrinkling it is recommended to expand membranes before cutting and module assembling by equilibration in the process solution for sufficient time.

Storage in dry conditions is preferred. If the membrane is pre-treated already, you should store in unsealed containers in 3-5 wt% NaCl solution or comparable neutral pH electrolytes.

Pre-Treatment and Conditioning:

The membrane is delivered in H-form and dry form. The membrane requires pre-treatment in alkaline water before installation in the electrolyser cell. The membrane should be wet out and expanded. The membrane can be immersed in 30% NaOH solution for two days at room temperature. Do not let the membrane dry out since micro-cracks may likely occur.

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

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 270 - 280 µm (microns)
Appearance / Color White
Backing Foil None
Delivery Form Dry
Reinforcement PTFE
Counter Ion H+ form
Dimensional Swelling in H2O at 25°C 5 %
pH Stability Range at 90°C 1 - 14

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