A hydrogen gas generator generates hydrogen gas by mixing two reactants. Heat is supplied to elevate the temperature of the liquid component of the samples to assist in the evaporation process. A resilient seal element extends adjacent to a flange element, maintaining an effective seal during axial andor radial movement, such as that caused by thermal expansion, of the resilient seal element relative to the flange element. The cam members include multiple lobes and extend about hinge pins that define an axis of rotation for the mullion. The method further comprises lining exposed surfaces of the insulative material, the conductive contact, and the at least a portion of the substrate in the at least one opening with a conductive material without forming the conductive material on the organic material. The sealing system preferably includes an additional barrier that reduces corrosion at the interface of the hubcap and an outboard face of the hub.