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The corona resistance of an electrical insulating material is its ability to withstand the deteriorating action of corona discharges. This article describes a test method that is yielding significant data on the corona resistance of materials which cannot generally be obtained thinner than 1/16 in. Data on several materials are presented. Corona resistance testing supplements dielectric strength testing as a means for material selection. Dielectric strength data, in many cases, cannot be interpreted in practical terms. For example, the user cannot choose intelligently between two materials with dielectric strengths of 500 and 1000 per mil when the application requires only 30 per mil and when voltage stresses in excess of 200 per mil will never be applied, even in factory high-potential tests.
Starr, W. T.
General Electric Co., Schenectady, N. Y.