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The dependence of the volume electric resistivity of heat-during epoxy varnish on the film thickness, temperature, and nature of inorganic fillers for films obtained by spraying on steel supports cured for 30 minutes at l60 °C was determined. Film thicknesses ranged between 5 and 56 µm, temperature between 24 °C and l40 °C, and the fillers were rutile type titanium micronizes mica, colloidal aluminium oxide, and aluminium silicate. The experimental data, treated statistically by the Linear regression method, shows a linear dependence of the volume electric resistivity on the film thickness and a hyperbolic one on temperature. The highest volume electric resistivity was obtained for films containing titanium dioxide and the lowest one for those with aluminum silicate. The volume electric resistivity depends on film thickness for films deposited from the solution and can not be considered a material constant.

INFLUENCE OF FILM THICKNESS, TEMPERATURE AND INORGANIC FILLERS ON THE VOLUME ELECTRIC RESISTIVITY OF HEAT-CURING EPOXY VARNISH