NOVELTY - Moldable, multiple-layer precursor composition (I) to an electrically conductive composite flow field plate or bipolar plate, comprises at least a first conductive sheet, a second conductive sheet, and a first conductive filler resin mixture layer disposed between the first conductive sheet and the second conductive sheet, where at least one of the first and second conductive sheet comprises a flexible graphite sheet.    USE - (I) is useful to an electrically conductive composite flow field plate or bipolar plate. (I) is useful in a proton-exchange membrane fuel cell.    ADVANTAGE - (I) is manufactured by fast and cost-effective roll-to-roll process, which is automated and adaptable for mass production. The process of preparing (I) does not requires expensive and tedious process such as chemical vapor infiltration. (I) is easily molded or embossed into a flow field plate or bipolar plate, which is highly conductive, low cost and used in a fuel cell with reduced contact resistance. (I) provides the bipolar plate with excellent structural integrity and is not subject to the delamination problem commonly associated with other multi-layer composites induced by the mis-match in coefficients of thermal expansion and elastic constants between layers. The flexible graphite layers are highly resistant to permeation by hydrogen and oxygen gases. (I) does not requires rigid ceramic or glass fibers to punch through flexible graphite layers and, hence the bipolar plate maintains a high permeation resistance. (I) can be made into a coiled form for easy storing, shipping and handling operations, hence the end-user can simply un-coil, cut and mold the material into bipolar plates. (I) have a long storage life.    DETAILED DESCRIPTION - Moldable, multiple-layer precursor composition (I) to an electrically conductive composite flow field plate or bipolar plate, comprises at least a first conductive sheet, a second conductive sheet, and a first conductive filler resin mixture layer disposed between the first conductive sheet and the second conductive sheet, where: at least one of the first conductive sheet and second conductive sheet comprises a flexible graphite sheet; and the conductive filler is present to render (I), after being molded into a plate, electrically conductive with a conductivity normal to the flexible graphite sheet no less than 10 S/cm or a conductivity parallel to the flexible graphite sheet no less than 100 S/cm.    DESCRIPTION OF DRAWING(S) - The figure shows the three-layer precursor composition.    First conductive sheet (82)    Second conductive sheet (84)    Core layer of a conductive filler-resin mixture. (86)