<p>A copolymer of 20 to 33 mol. % vinylidene fluoride, 15 to 45 mol. % of ethylene and 30 to 65 mol. % of tetrafluoroethylene gives a dielectric material having a large dielectric constant of 4.0 or above and a small dielectric dissipation factor (tan delta ) of 0.8% or below, and is suitable for use as a condenser film.</p>
