TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Properties: The graphite density before compression is 0.08-0.8 g/cc, preferably 0.08-0.5 g/cc. The graphite density after compression is 1.0-2.2 g/cc. The sealant fills preferably 70-95 vol% of the pores of the plate.Preferred Process: Compression further includes forming a pattern in at least one planar surface. The graphite plate is a fluid-flow plate of a fuel cell and the pattern is continuous fluid-flow channel pattern which extends through at least one planar surface.Preferred Sealant: The sealant is chosen from phenolic resin, vinyl resin, silicone resin, acrylic resin and/or epoxy resin. The sealant further comprises a monofunctional acrylate ester and a curable poly(meth)acrylate ester of formula (I).R1 = H, 1-4C alkyl, 1-4C hydroxy alkyl or compound (II);R2 = H, halogen or 1-4C alkyl;R3 = H, hydroxyl or compound (III);m = 0-12;n = 1;k = 1-4; andp = 0 or 1.The monofunctional acrylate ester is preferably chosen from lauryl methacrylate, cyclohexylmethacrylate, tetrahydrofurfuryl methacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate, t-butylaminoethyl methacrylate, cyanoethylacrylate and/or chloroethylmethacrylate. Preferred Initiator: A free radical initiator is provided to initiate curing of the sealant. The free radical initiator comprises a heat-curing initiator or anaerobic-curing initiator. The heat-curing initiator produces free radicals by thermal decomposition and the anaerobic-curing initiator produces free radicals by exclusion of oxygen. The heat-curing initiator is selected from (hydro)peroxide, perester and/or azonitrile. The anaerobic curing initiator is a peroxy initiator chosen from (hydro)peroxides and/or peresters. The anaerobic-curing initiator consists of an anaerobic accelerator chosen from tributyl amine, benzoic sulfimide, formamide and/or copper octanoate. EXAMPLE - A flexible graphite panel with density of 0.22 g/cm3, was placed and secured in an empty 1 liter vacuum impregnation chamber. The chamber was fitted with a pressure-compensating reservoir containing liquid porosity sealant Resinol. The chamber and reservoir were evacuated to a pressure of about 0.13 kPa at 23degreesC. After 15 minutes, 300 ml of the liquid sealant was introduced into the chamber at pressure of 0.13 kPa and maintained for an additional 15 minutes after which the vacuum was released and the pressure was restored to ambient. The panel was held in the submersed state for an additional 1 hour, then removed from the chamber and rinsed with water to remove all traces of the sealing adhering to the external surface. The washed panel was dried and weighed to obtain impregnated panel. The impregnated panel was placed between two glass panels and gently compressed under hand pressure to obtain compressed impregnated panel which was rinsed with water to remove excess sealant from the panel exterior surface. The panel was cured under elevated temperature of 90-180degreesC to obtain a gas impermeable graphite plate which was mechanically strong.