This porosity generally admits mixing of oxygen and fuel, in particular, hydrogen and resulting in the uncontrollable combustion. Commercially available graphite plates are fine grained and have porosity ranges from 10 to 20 %(volume ). Since Graphite plates are used as gas separators, these plates have to be impervious to reactant gases at operating conditions of fuel-cell. The impervious graphite plates are used as gas separators and reactant distributor-cum-current collectors in the PEM fuel cell stack. The electrochemical cell comprises of an anode, a cathode, and a polymer electrolyte membrane. A polymer electrolyte fuel cell is a type of electrochemical fuel cell which employs a membrane electrode assembly(MEA). Further interest in such fuel cells has been intensified by the demand for nonpolluting power sources. In recent years considerable attention has been directed to the development of Polymer Electrolyte(PEM) fuel cell stacks for transportation applications. This invention relates to A METHOD OF RENDERING A POROUS GRAPHITE PLATE IMPERVIOUS TO FLUIDS. It does not store any personal data.A method of rendering a porous graphite plate impervious to fluids, comprising the steps of placing at least one such plate in a chamber capable of withstanding vacuum(102 Torr) and positive pressures up to 10 Kgcm-2 degassing the plate, under vacuum created in the chamber, for removal of any gas entrained in the plate submerging the plate, in the chamber, in a solventless thermosetting resin or in a thermosetting resin solution(10-40% by weight of resin in the solution), such as epoxy resins, phenolic resins, polyester resins, polyimide resins, unsaturated polyester resin, and forcing the resin into the pores of the plate by introducing, into the chamber, inert pressurised, such as, air, nitrogen evacuating the said pressurised gas, thereafter, to create a vacuum in the chamber repeating the cycle of successively subjecting the plate to pressurised gas and vacuum, until the said plate is impregnated to a predetermined loading of the resin removing the plate from the chamber and allowing the solvent to evaporate, leaving the resin in the pores of plate to polymerize therein. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
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