Abstract: The invention relates to a process and a device for the production of shaped bodies of plastic material, in particular polyurethane foam, in molds introduced into an inductor.A process of this type comprises the improvement that for the production of shaped bodies of plastic material, in particular of polyurethane foam or of fibers, non-woven fabrics or the like impregnated or wetted with synthetic resins, latex or the like, of the reactive starting materials introduced into the molds, a frequency of 1 to 30 kHz preferably 5 to 12 kHz, is adjusted and that molds are used in which the individual mold parts are mutually electrically insulated in order to prevent a current flow in the mold around the shaped body and that optionally reinforcements or coating pieces of a material optionally identical to the material of the mold are formed on or applied to the outsides of metallic mold walls for the distribution of the current flow.