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Dielectric constant, dissipation factor, dielectric strength, surface and volume resistivity are all fundamental electrical properties of epoxies. How they are measured, what values are desirable and how they react to changes in temperature, fillers and other variables are considered in this paper. The specific composition of resin and curing agents will also affect the electrical properties of a cured epoxy system. Three major types of curing agents are explained in this paper along with their benefits and trade-offs with respect to electrical properties.