Dielectric constant (K) and loss tangent (tan &dgr;, the dissipation factor) measurements on the plastic polyvinylidene fluoride have been made over the frequency range 50 cycles to 9800 Mc at room temperature. Pronounced anomalous dispersion inKand a peak in tan &dgr; near 10 Mc were observed. Theoretical and practical applications of the data are briefly mentioned. This material has an unusually high dielectric constant and is quite lossy, especially when compared to the chemically and structurally related plastics polyethylene and polytetrafluoroethylene.