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As the power system generation requirements for aerospace airplanes and spacecraft systems increase, higher voltage levels may be desired to reduce power system losses and weight. The principal objection to using high-voltage power and electronic systems and components is the probability of corona and/or partial discharges. This is especially true for vehicles operating in the altitude-pressure zone between 50,000 feet and 120,000 feet. Densely-packaged power systems and electronic modules utilize very small spacings between parts and printed circuit board traces. There exists a multitude of spacing-air density conditions where the corona or partial discharge Paschen law minimum voltage pressure-spacing characteristic is satisfied to produce corona, partial discharges or gas breakdown initiation. For air, the critical pressure-spacing product density to satisfy the Paschen minimum of 327 volts dc, or 200 volts ac, is 0.7 torr -cm.