Common knowledge tells us that corrosion is a major stress factor for unprotected wire coils and enamelled copper wires. Depending on the intended subsequent utilization of such parts also mechanical vibrations, humidity and temperature may have to be taken into account. This is of particular importance when dealing with high-voltage parts and substrates, because the volume resistivity of the dispensing material has significant influence on high-voltage insulation. Of course, simply pouring potting material over a coil does not solve all these problems. The dispensing material or the tiny gaps between the wire coils may contain air trapped within. This significantly reduces high-voltage insulation or ruins it altogether. Therefore, to ensure an impregnation that is completely free of air bubbles, the entire preparation, feeding and metering process must be carried out in a vacuum.
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