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Gasketing

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Gasketing

Gaskets in a Fuel Cell provide the correct compression and act as a ‘barrier’ for potential fuel leaks; maximizing the highest possible efficiency.

One of the most important parameters in a fuel cell cosntruction is the thickness of the gaskets. This determines how much the flow fields are allowed to pinch into the electrode. For a good contact (i.e. low contact resistance), it is essential that the values are 0.002” to 0.003” for a carbon paper backing and 0.010” to 0.015” for a carbon cloth backing*.
Since electrode thickness for anode and cathode may vary, gasket thickness for each side is determined separately using the formula: Gasket thickness = (individual electrode thickness) – (desired pinch)

Note: These numbers are provided for a guidance only. It is better to determine the pinch for individual situations with correct consideration for the type of backing used and the nature of the gasket material (elastomeric materials, e.g. EPDM, tend to compress more than non-elastomeric films, e.g., PTFE)