The thermomechanical method was used to assess the density of the three-dimensional chemical network and the reliable working time of cable insulation, produced by different manufacturers, based on polyethylene crosslinked by radiation, peroxide, and silanol methods. It was shown that the reliable working time of the three-dimensional chemical network is higher in the case of the peroxide crosslinking method than in the case of the silanol and radiation methods owing to the different temperature conditions of curing.
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