Abstract: A devulcanization product of comminuted scrap rubber of rubber granules, in which the sulfur bridges of the rubber granule surface are broken and activated for a new vulcanization, is produced by treating the rubber granules to swell the rubber structure of the granule surface and by mixing the treated rubber granules with a devulcanization formulation, acting mechanically and chemically reductively on the rubber granules, in a heating and cooling mixer combination. The rubber granules and the devulcanization formulation are heated to a temperature of 105-150° C. and subsequently immediately cooled. A devulcanization compound is prepared by mixing the devulcanization product with vulcanization and binding agents so as to coat the rubber granules uniformly with them The devulcanization compound can also be prepared by coating the swelled rubber granules in layers by admixing vulcanization agents such as accelerators, activators, auxiliary agents, binding agents, oxygen radical donors and scavengers.