NOVELTY - A combination of bipolar plate (1) and elastomeric sealant (50, 70), where the bipolar plate has anode side with flow channels for transport of proton-donating fuel and/or a cathode side with another flow channels for transport of proton-accepting fluid. The sealant is provided parallel with the bipolar plate for sealing the bipolar plate against adjacent electrolytic membrane. The sealant has fluid channels across the sealant for transport of proton-donating fuel or proton-accepting fluid across the sealant and along the bipolar plate.    USE - A combination of bipolar plate and sealant for PEM fuel cell useful in producing electric power and/or heat or useful as back-up power system or as continuous power generation system (claimed).    ADVANTAGE - The inclusion of sealant achieves gas tight sealing around the entrances or exits of the fuel channels or fluid channels in a simple manner. Thus, no difficult production process with narrow tolerances is required, which makes the production easy and minimizes production costs.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a bipolar plate having penetrating inlet hole for hydrogen gas entering the fuel cell, and penetrating outlet hole for hydrogen gas exiting the fuel, where the bipolar plate has a groove for accommodating the sealant and efficiently avoid escape of gas except via the channels, and the cathode side has more grooves defining flow channels for oxidant gas and connecting inlet channels for oxidant gas with outlet channels for oxidant gas;    (2) a method for manufacturing a bipolar plate, comprising providing a material having dimensions corresponding to the desired design of the bipolar plate, providing details of the desired design by milling off excessive material in a milling machine, and optionally coating the plate with a corrosion resistant coating;    (3) a sealant for sealing the cathode side of the bipolar plate;    (4) a process for manufacturing a sealant, comprising molding the sealant material into the desired design of the sealant;    (5) a proton exchange membrane (PEM) (40) fuel cell stack comprising the bipolar plate and sealants; and    (6) a PEM fuel cell stack system, comprising a fuel cell stack.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the anode side of the combination of sealant and bipolar plate.    Bipolar plate (1)    Proton exchange membrane (40)    Sealants (50, 70)