Impregnated coils and transformers provide many of the benefits of molded and encapsulated parts, with a significant advantage.

They do not require expensive, dedicated tooling.

Impregnated coils and transformers are created by using a vacuum to remove air and replacing it with a varnish or epoxy impregnant. The resulting matrix provides added dielectric strength, as well as resistance to solvents, salt, water and other harmful agents.

Because impregnants create a bond between the wire and the impregnant, transfer of heat and heat dissipation is greatly improved.

The dielectric characteristics and bonding can be enhanced further through the use of capillary networks within the coil, and by choosing the proper impregnation material to produce the desired bond.