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One of the important tests included in the Society's Standard Methods of Testing Varnished Glass Fabrics and Varnished Glass Fabric Tapes Used for Electrical Insulation (D 902 - S3) is the test for the effect of elevated temperature. This particular test method, for varnished glass fabrics and tapes, was developed for the purpose of showing the ability of the varnished film to resist excessive impairment of its physical and electrical characteristics when the material is subjected to a specified oven temperature for a prescribed period of time in free air. Those members of the Society who actively participated in this work were well aware of the various end uses for varnished glass fabrics made of the numerous glass fabric constructions as well as the varied types of varnished coatings. Specifically, this paper will be confined to the tests on silicone varnished glass fabrics showing how it is affected by elevated temperatures. It will also describe the various other tests, including the conclusions relating to the merits for each of these particular methods of test, which were considered by the working group to determine the effect of thermal aging on this type of electrical insulation. The results of this work are clearly exemplified by the acceptance of this test method for many material specifications and standards for this material.
Anderson, O. E.
Continental-Diamond Fibre Co., Newark, Del.