A high pressure, low porosity wet seal for a substrate in a fuel cell in which {TAIL ~ the seal} is made up of a granular material having {HEAD ~ a particle size} varying from 10 to 0.1 microns in size bonded together with polytetrafluoroethylene to prevent leakage of the gaseous fuel or oxidant from the cell 
A high pressure , low porosity wet seal for a substrate in a fuel cell in which { TAIL ~ the seal } is made up of a granular material having { HEAD ~ a particle size } varying from 10 to 0.1 microns in size bonded together with polytetrafluoroethylene to prevent leakage of the gaseous fuel or oxidant from the cell
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