We are studying the dielectric properties of EPR with and without filler. In this paper, we investigate the electrical conductivity and the discharge current of EPR without filler at high temperatures from 60 to 90°C. We obtain three parametersα, τ{sub}0 andε(r0){sub}-ε{sub}(r∞) from the curve fitting of the experimental results for the discharge currents to the theoretical equation. The parameters, α and ε(r0){sub}-ε{sub}(r∞) are almost independent of temperature. In contrast, thecharacteristic relaxation time, τ{sub}0, decreases with increasing temperature. The activation energies for the electrical conductivity and relaxation time are 0.74 and 0.89 eV, respectively, being close each to each. Therefore, it is suggested that thedielectric relaxation is associated with the conduction process.
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