Encapsulated high voltage components

For many years the electronic industry has recognized the merits of epoxy resin for environmental protection of equipment and components. The major usage has been confined to equipment of relatively low voltage, but recently there has been increasing interest in applying epoxy resins to higher voltage units where liquids such as mineral oil would normally be used. Applications such as airborne equipment are ideal for this type of material since size, weight, and the elimination of oil problems such as expansion and small leaks are important.