A rack for a compost bed includes a rack bottom, a carrier which is supported with respect to the rack bottom for the compost bed and a liquid device provided with a liquid supply and a liquid discharge via which a liquid can be passed in order to heat andor cool the compost bed on the carrier. The rubber composition includes 100 parts by weight of a rubber component, 0. A pair of opposite positioning ears extend upwardly from corners where the carriage arms are connected with the connecting wall. The main cutting edges of the alternating cutting plates complement each other in the region of a central, offset cutting part, forming a cross-cutting edge which is interrupted by a center hole. The inner electrode is in electrical communication with the second terminal of the housing.