The progress of vulcanisation of NBR rubber compounds with and without carbon black was monitored by simultaneous measurements of electric current and dielectric loss tangent (tanδ) under alternating current of 40 or 120V at 60Hz. The vulcanisation was carried out in the press mold equipped with two electrodes insulated from its surroundings by poly (tetrafluoroethylene). The curves of electric current and tanδ against cure time showed a rapid increase with the progress of vulcanisation reaction followed by saturation after completion of the reaction. The curves obtained in the electrical measurements were found to be similar to conventional torque-cure time curves.
