NOVELTY - Conductive molding composition comprises unsaturated prepolymer resin having 1 or more unsaturated polyester and vinyl ester resin, unsaturated material (with terminal ethylene group) copolymerizable with the resin, at least 50 weight% (wt.%) of conductive filler, an initiator to initiate copolymerization and rheological modifier to prevent phase separation between resin and filler during molding.    USE - The composition is used for electrochemical cell flow field plates (claimed) used in fuel cells and stationary power units.    ADVANTAGE - The molding composition is used for bipolar plates which has bulk conductivity of at least 40, 50, 60, 70, 80, 90 or even 96 S/cm. The plates have desirable surface characteristics, heat, chemical and shrink resistance and high strength. The use of rheological agents eliminates phase separation, cracking and inconsistent conductivity measurement. Properties such as coefficient of thermal expansion, electrical and thermal conductivity, shrink resistance and mechanical properties are improved. The resin composition shows higher glass transition temperature, thereby improving hot strength of the molded part. The composition enables mass production of bipolar plates at low cost. Properties of the composition are further increased by optimizing both gel and cure time for the prepolymer by controlling the amount and type of initiator and inhibitor. The modifiers reduce shear and promote flow in the composition during molding. The molded products obtained from composition has increased conductivity, strength and corrosion resistance.    DETAILED DESCRIPTION - Conductive molding composition comprises unsaturated prepolymer resin having 1 or more unsaturated polyester and vinyl ester resin, unsaturated material (with terminal ethylene group) copolymerizable with the resin, at least 50 weight% (wt.%) of conductive filler, an initiator to initiate copolymerization and rheological modifier to prevent phase separation between resin and filler during molding. The rheological modifier is 1 or more compounds chosen from group (II) oxides and hydroxides, carbodiamide, aziridine, polyisocyanate, polytetrafluoroethylene, perfluoropolyether, polyethylene and fumed silica and clays.    INDEPENDENT CLAIMS are also included for the following:    (i) an electrochemical cell flow field plate comprising a conductive molded thermosetting resin composition having thickness of 0.05-0.2 inches and bulk conductivity of at least 55 S/cm;    (ii) molded conductive article comprising the cured reaction product of 100 parts of an unsaturated prepolymer resin which comprises one or more of unsaturated polyester and vinyl ester resin, an unsaturated monomer chosen from styrene, alpha-methylstyrene, chloro-styrene, vinyl toluene, divinyl benzene, diallylphthalate and methyl methacrylate and their mixtures. The ratio of monomers to unsaturated prepolymer resin is 40:60-72:25 by weight of 2 components, at least 225 phr of a conductive filler such that the composition has a bulk conductivity of at least 55 S/cm based on ASTM F1529-97, 0.5-4 phr of an initiator and 0.5-20 phr of rheological modifier; and    (iii) a method of molding highly loaded polymer which is the reaction product of the conductive molding composition under heat and pressure such that the composition is cured to form the molded article.    DESCRIPTION OF DRAWING(S) - The figure shows the illustration of a bipolar fuel cell plate.    Plate (10)    Flow channels (12)    Ports (14, 16)    Entry fluid manifold (18)    Exit fluid manifold (19)    Holes (20)