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Hull Cell Testing Equipment In 1935, the E.I. duPont De Nemours Co. asked Kocour Company to manufacture a plating test cell developed in their laboratory. The cell, called a Hull Cell, is a miniature plating unit for producing a cathode deposit that records the character of electroplate at all current densities within the operating range. It is among the most useful tools available to the plating chemist for control of plating baths. It is an indispensable adjunct to standard analytical methods, enabling the skilled operator to determine and control the effects of addition agents, impurities and purification treatments on the plating electrolyte, many of which can be determined by no other method. Practically every plating solution can be controlled or evaluated to varying degrees by the use of the Hull Cell. See features below. Kocour Company offers a complete selection of Hull Cells, accessories and related equipment to enable the plater to effectively use this plating process control method.