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The determination of the life of insulating materials at a given operational temperature is one of the most important tests which must be carried out on these substances. Depending upon the type of material concerned, various criteria are used for their study. By accelerated aging under forced conditions an attempt is made to obtain a picture of their behavior at the intended operating temperature.
As a result of recent development efforts by magnet wire manufacturers, new film insulations with improved physical, electrical, chemical, and thermal properties are now available to the electrical industry. Examples of these are modified polyvinyl formal, over-coated polyester, acrylics, epoxies, polyurethanes, and others.
The insulation user is waiting patiently for the perfect insulation — a material that has the dielectric of synthetic films; that will withstand temperatures of mica; that is as resilient and flexible as silicone rubber; that is as tough as epoxies or polyesters. An insulation in the form of a liquid or semi-liquid with an infinite pot life, that a component can be dipped into and will air-dry in...
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