Heat store component and heat exchangers fitted therewith, in particular for flue gas cleaning systems of power plants

A heat store component for the passage of a flow of gas therethrough, in particular in heat exchangers of flue gas cleaning systems, comprising a mounting, a first heat storage medium and a second heat storage medium, wherein the mounting forms an inlet side and an outlet side of the heat store component for the flow of gas that is to be fed therethrough, wherein the first and second heat storage media are arranged one behind the other in the direction of flow of the gas between the inlet side and the outlet side of the mounting and each comprises a plurality of substantially parallel flow channels, wherein the second heat storage medium is formed of one or more honeycomb blocks, wherein the honeycomb block or the honeycomb blocks comprise a body that is produced in one-piece manner from a plastics material and incorporate a plurality of flow channels which are arranged in parallel with one another and are separated from each other by channel walls, wherein the plastics material comprises a plastics which contains virgin polytetrafluoroethylene (PTFE) as a fraction of ca. 80% by weight or more and optionally a high performance polymer differing from the PTFE as a fraction of ca. 20% by weight or less.