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This communication describes work and gives results focused on the application of Differential Scanning Calorimetry (DSC) to reveal the effect of thermal aging on the crystallinity variation of XLPE insulation cables. The changes in the crystalline phase of XLPE during aging at four different temperatures have been analyzed. This study shows also the effect of aging on the melting peak temperature Tm and melting enthalpy Â¿Hm. The obtained results pointed out that thermal aging at temperatures above the melting temperature of XLPE have a great effect on the crystallinity variations.