Applications of solventless-type varnishes in the electrical industry

Fluid resins capable of complete solidification have been available since the end of the war. The contribution that these materials can make to the industry is based upon their ability to produce void-free structures, and to completely fill any cavity in which they are cured. The benefits which may be derived from this property can be itemized as: 1. Absence of corona from windings, operating at high dielectric stress, particularly at high altitudes 2. Improved heat transfer properties by means of a solid path from the source of heat to the surroundings 3. More effective seals against the entrance of moisture and corrosive atmospheres 4. Superior mechanical strength of impregnated windings 5. Ability to form molded exterior insulations by casting processes which require no pressure