Abstract Because of their good thermal, electrical and mechanical characteristics, coupled with the fact that on curing they evolve no volatile by-products and undergo only a small volume shrinkage, epoxy resins have found considerable application in the manufacture of castings for the high voltage electrical industry. This trend has been particularly evident in Europe where since the mid-1950s electrical equipment manufacturers have utilized the design freedom resulting from the use of epoxy casting techniques to manufacture switchgear components, instrument transformers, distributor transformers, insulators, high voltage cable accessories, etc. Such components utilize from as little as 1 or 2 lb to as much as several hundred pounds of formulated casting mix. In the United States such techniques have not found use to the same extent. Several reasons can be postulated to account for this difference, but in the authors' opinion, the most significant deterrent has been the inherently low production rates ac...