In our earlier studies, we investigated the dynamical- mechanical and electrical punching properties for the PP+PP fibers and PP+glass fiber composites for the purpose of reinforcing the properties of the materials which are made from PP. The best reinforcing ratios are found in around 50%, in case of PP fiber (20-25)% and in case of glass fiber (0.2-0.5)%. In cable industry and other electrical processes long-term electrical punching occurs and at that time the dynamical-mechanical properties can change simultaneously. To explain the mechanisms of these processes optimal doping ratios, we have investigated for the long-term electrical punching effects on pure PP dynamical-mechanical properties. It is shown that the breaking strength (σ) for both samples (pure and doped PP fibers), depends on both electrical strength value (E) and the degradation time (t) on the electrical strength. When the electrical strength and time are increased, σ significantly decreases. On the other hand, for the optimally doped PP there is a lower decrease in σ. In both situations it significantly drops. If we suppose that the long-term electrical punching comes out by electrochemical process we can explain the above results, with the best filling ratio of doping and the most effective interaction of doped material on the bounderies of the supramolecular formations. It is probable that, under the electrical and mechanical stress, “the cross- destruction effects” occur simultaneously. That is, on the other hand, caused by the mechanical stress effect, microscopic cracks occur and it lowers the activation energy of electrical punching. On the contrary, under the effect of an electrical field both the concentration of the electrons which have impact effects increases and the results of the electron bombardments, the breaking activation energy of polymer chains decreases and polymer degrades at smaller σ. In reality, it is observed that the optical densities of the (1680 cm−1 and (1720-1760) cm−1) peaks which belong to C = C and C = O bands significantly increase.