Epoxy Resin are commonly used in Encapsulated (Potted) Transformers in North America for applications where environmental conditions make general-purpose ventilated dry-type transformers unsuitable. In these units, the entire core and coil assembly is fully encapsulated in a silica sand and polyurethane (or epoxy) mixture, forming a solid, protective mass. This encapsulation seals the windings against airborne contaminants, moisture, and other harmful environmental factors.

Typical applications include:

• Corrosive environments – such as petrochemical plants, steel mills, and pulp & paper facilities.

• Damp or wet conditions – including mines, pump houses, underground locations, or rooftop service areas.

• Dust-laden or particle-heavy processes – industries with high levels of airborne dust, conductive particles, or other pollutants.