The dielectric analysis technique was used to characterize an epoxy cured system consisting of a diglycidyl ether of bisphenol A (DGEBA, n = 0) and 1,2 diaminecyclohexane (DCH). With this purpose, the permittivity epsilon', the loss factor epsilon", and the dissipation factor tan delta were determined experimentally. The transition observed within the temperature range studied was associated to a alpha-relaxation process, the T-g of which was taken as that corresponding to the maximum of the epsilon" - T curve recorded. Argand diagrams for the different temperatures were constructed, and owing to the asymmetry showed by these diagrams, the Havriliak-Negami model was used to analyze data. It was observed that, within the frequency range (0.1 - 300 Hz) used for this study, the relaxation time follows an Arrhenius behaviour, thus allowing calculation of the activation energy E-a and T-g in good agreement with literature values. (C) 2003 Elsevier Ltd. All rights reserved.