DIELECTRIC MATERIAL FOR INFLUENCING ELECTRIC FIELDS, AND STRESS CONTROL DEVICES MADE THEREFROM

A dielectric composition for influencing electric fields comprises a dielectric base material having distributed therein electrically conductive platelet-shaped particles and plateletshaped particles of an insulating material different from the base material and having a higher electrical breakdown voltage than said base material. The concentration of the conductive platelets is below a limit concentration at which the composition exhibits an electrical volume resistivity characteristic for insulating materials. The number and size of the insulating particles is comparable with that of the conductive particles. The novel composition exhibits the advantages of conventional materials which do not have the platelet-shaped particles of insulating material while exhibiting also increased safety against glow phenomena, flash-overs and breakdown even at high voltages.