Abstract: An electrolyzer is formed by electrolytic cells, electrically connected in serious. Each cell is provided with inlets and outlets for filling with electrolyte into which dip the positive oxygen electrode and negative pressurized hydrogen electrode with an inner outlet of hydrogen. The hydrogen electrodes are formed by at least one inner layer, by covering layer and by the metallic coating. Said inner layers have the value of hydrogen overvoltage at the highest 0.25 V, said covering layer has the hydrogen overvoltage between 0.3 and 0.4 V and said metallic coating has the hydrogen overvoltage between 0.5 and 1.5 V. The hydrogen electrodes, formed as non-polarizable reversible systems are connected through their inner hydrogen outlets with the inlet of the hydrogen receptacle on condition given byV.sub.O <1/2V.sub.HwhereV.sub.O is the volume of the part of the electrolyte reservoir which is filled with oxygenV.sub.H is the volume of the hydrogen receptaclewhere by the oxygen electrodes are polarizable.

Abstract: A technique is described for treating polytetrafluoroethylene surfaces with an amalgam of an alkaline metal to alter the surface thereof chemically and/or physically.