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Both low density and cross-linked polyethylene 1.5 mm-thick virgin samples have been submitted to a HVDC (20 kV) at room temperature. When the steady-state current was reached, the temperature was increased up to 70degC (ramp: 0.5degC/min). After a stay at 70degC, the temperature was then reduced. During this heat treatment, the external current was recorded. Analysis of this external current revealed...
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