The conductive filler loading dominates the amount of preexisting conductive paths in a CPC material before annealing. The resistivity responses during annealing are also affected by the polymer polarity. Fig. 2a and b depict the plots of volume resistivity versus annealing time of the CNT/EVA10 and CNT/EVA25 samples with different CNT contents at 140 °C It suggests that tp decreases with increasing CNT loading. The incorporation of more CNTs into the composites leads to an increase in the number of preexisting conductive paths, resulting in a shorter tp needed to activate the conductive network. As described in Fig. 2c, at a low CNT content, tp of the CNT/EVA10 is still shorter than that of the CNT/EVA25. When the CNT content rises, both composites almost have the same values of tp.