Abstract
The temperature dependence of the d.c. conductivity of epoxy laminate has been studied before and after exposing the samples to moisture (relative humidity 70 to 95%) and various exhalates (HCl, HNO3, HCOOH, CH3COOH, NH3 and SO2 vapours) which are generally released by electronic packaging materials. The d.c. conductivity increases with increase of temperature. At a particular temperature the d.c. conductivity increases after exposing the samples to moisture and exhalates, the increase being more at higher exposure times. The results have been explained on the basis of Fickian adsorption of moisture and consequent dissolution of the exhalate vapours in it, which possibly increases the conductivity due to ion formation.
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