Dielectric absorption is a physical phenomenon in which the insulation appears to “absorb” and retain an electrical charge slowly over time. This is demonstrated by applying a voltage to a capacitor for an extended period of time then quickly discharging it to zero voltage. If the capacitor is left open circuited for a long period and is then connected to a voltmeter, the meter will read a small voltage. This residual voltage is caused by “dielectric absorption”. This phenomenon is commonly associated with electrolytic capacitors.
When you measure IR of various plastic materials, this phenomenon causes the IR value to increase over time. The inflated IR value is caused by the material absorbing charge slowly over time. This absorbed charge looks like leakage.
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