TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The composite composition further comprises reinforcement or filler having graphite, carbon fiber, carbon nano-fiber, nano-tube, glass fiber, ceramic fiber, polymer fiber, metal fiber, metal particle, polymer particle, organic particle, and/or inorganic particle. The binder or matrix material comprises polymer, ceramic, glass, metal, carbon, polymeric carbon, asphalt, tar, coal tar pitch, petroleum pitch, and/or mesophase pitch. The polymer is polyethylene, polypropylene, nylon, polyesters, PTFE, polyvinylidene fluoride, fluoro polymers, polyacrylonitrile, acrylic resins, epoxides, polyimide, bismaleimide, phenol formaldehydes, vinyl ester, and/or isocyanate resins. The binder or matrix material comprises an inorganic vitreous glass-forming material having boric oxide, silica, phosphorus pentaoxide, germanium oxides, vanadium pentoxides, or beryllium fluoride. The glass-forming composition comprises at least two oxides of silica, aluminum oxide, sodium oxide, potassium oxide, magnesium oxide, cuprous oxide, barium oxide, lead oxide, and boric oxide. The binder is unsaturated polyester resin, vinyl ester resin, epoxy resin, phenolic resin, polyimide resin, bismaleimide resin, polyurethane resin, and/or thermoplastic resin. The exfoliated graphite comprises exfoliated natural graphite, synthetical graphite, highly oriented pyrolytic graphite, graphite fiber, graphitic nano-fiber, graphite oxide, graphite fluoride, and/or chemically modified graphite. Preferred Contents: The reinforcement or filler is 0.5-30 wt.% on total weight of expanded graphite, particles of non-expanded graphite or carbon, and reinforcement or filler. Preferred Properties: The composite composition has thickness-direction electrical conductivity of not less than 50, preferably not less than 200 S/cm. The composite composition has a flexural strength of not less than 50 MPa. The composite composition has an electrical conductivity parallel to surface plane of not less than 1000 S/cm, thickness-direction conductivity of not less than 35 S/cm, or specific areal electrical conductivity of not less than 200 S/cm2. The composition is molded into a flow filed plate having two primary exterior surfaces having flow field channels on at least one of the two exterior surfaces. The composite composition is shaped into a plate having a thickness of 1, preferably 0.5 mm. EXAMPLE - Non-expandable natural graphite particles (30 wt.%) and bromine-intercalated (70 wt.%), expandable graphite were dried blended. The mixture was enclosed in a quartz tube, purged with nitrogen gas and then sealed from both ends of the tube with ceramic cloth. The tube was rapidly transferred to the center of a tube furnace preheated at 600 degrees C, and maintained for 30 seconds. Rapid expansion of the expandable graphite occurred, resulting in a compressible mixture of exfoliated graphite worms and non-expanded graphite. The compressible mixture was impregnated with a mixture of a volatile diluent (acetone (3 times of curing agent)) and the curing agent of a two-component epoxy resin. The diluent was used to reduce the viscosity and surface energy of the curing agent, thus promoting impregnation and wetting of exfoliated graphite with this curing agent. The volatile diluent was removed under a chemical fume hood. The curing agent-impregnated compressible mixture was then impregnated with the epoxide, the second component of the epoxy resin system. Once the interior and exterior surfaces of the pores in exfoliated graphite were wetted with the curing agent, subsequent impregnation or infiltration of the resin was essentially spontaneous. The exfoliated graphite-based bipolar plates had excellent electrical conductivity properties.