Impregnating varnishes and epoxy

Impregnating varnishes

Impregnating varnishes

Impregnating varnishes are key components of modern motor, generator and transformer production. They turn the laminated core and the wire winding into a homogeneous and mechanically stable unit. The advantages are excellent protection against a wide variety of environmental factors as well as improved heat transfer between wire winding, slot insulation and core.

The product shows, due to the high content, a very low flow time and therefore an excellent penetration ability. Dilution of the varnish can be curried out with demineralized water. For a correct management of the product, it will be necessary to observe carefully the viscosityand PH value. The curing of the varnish must be occurred gradually, The temperature in the first step should be kept at 80 to 100 °C so that to evaporate a high degree of water and to avoid bubbles. After the drying process will be finished at 130-150 °C.


Epoxy resins are created by transforming liquid polyethers into infusible solids through a special curing process. In most cases, resins are the result of a chemical reaction between epichlorohydrin and bisphenol-A. Overall, the creation of epoxy resin is part of an industry that generates over $15 billion US Dollars annually.

Epoxy resins have many different uses. For example, resins that are cured through exposure toultraviolet light are commonly used in fiber optics, optoelectronics, and dentistry. Industrial tooling applications use epoxy resins to make laminates, castings, fixtures, and molds. In the electronics industry, epoxy resins can be used to make insulators, transformers, generators, and switchgear.

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