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Materials commonly used as dielectrics include glass ceramic plastic film paper mica air and oxide layers. Capacitors are widely used as parts of electrical circuits in many common electrical devices. Recent Advances In High Energy Storage Capacitors Tube Sharetechnote Fr4 Epoxy Integral Capacitor Dielectric Material Properties Dry air is an excellent dielectric and is used in variable capacitors and some types of transmission lines. Dielectric material capacitor . The capacitance is inversely proportional to the electric field between the plates and the presence of the dielectric reduces the effective electric field. Dielectric materials are essentially insulators which means that no current will flow through the material when a voltage is applied. Parallel plate with dielectric. The nonconducting dielectric acts to increase the capacitors ch...