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Minnesota Mining and Manufacturing Company st. Paul, Minnesota Pressure sensitive vinyl tapes are extenSively used as an outer wrap for cable splices and terminations, and for bus bar insulation and other high voltage applications. For such service, resistance to corona is an important factor. However, most published information on corona resistance if.. con.cerned with polyethylene and insulations other than vinyl (1-8).This paper is a preliminary report ofa study which has three related objectives: a) to obtain meaningful data on comparative long time corona reSistance; b) to determine the best configuration of the unavoidable lap jOints in taped constructions; and c) to determine the chemical and physical mechanism of corona failure as a basis for developing improved products.This report provides initial information on the following studies:1) Corona resistance as a function of electric stress, humidity, and type of electrodes;2) The effect of lap geometry on time to failure;3) The local surface resistivity of eroded specimens and its effect in determining the location of breakdown.

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