epdm with a hardness of 80 sha 4 ethylene propylene diene monomer rubber epdm with a hardness of 40 sha the tooling used was a co rotary twin screw extruder of which the speed of the screws is indicated in the last line of the table 2 here below according to the considered rubber 1 to 5 moreover in this table 2 are detailed according to the considered rubber 1 to 5 the temperatures of the co rotary twin screw extruder according to the progress of the method according to the invention namely the example here below illustrates the use of around 20 in weight of a polymeric composite obtained from a method according to the invention in a rubber formulation this rubber formulation corresponded to a standard formulation of the range of vulcanized rubbers commercialized by the plymouth francaise company the polymeric composite was obtained by applying the method according to the invention to a sample of the formulation a such as described in table 3 here below after vulcanization in order to do this a sample of the formulation a has been subjected to the devulcanizing method according to the invention which has been achieved in a co rotary twin screw extruder of which the technical features were the following the ratio of the length of the screws on the diameter of the screws was equal to 60 the rotational speed of the screws was of 185 rev u00b7 min u2212 1 a first portion for which the length of the screws was equal to 4 times the diameter of the screws a second portion for which the length of the screws was equal to 28 times the diameter of the screws a third.