This study deals with the influence of the alternative filler content , as a partial replacement of the commonly used filler - silica, on the process of mixing elastomeric blends and subsequent vulcanization. Commonly used fillers such as silica and carbon black often increase the temperature of the blends during the mixing process due to their reinforcing properties and low particle size, which leads to the need of cooling the elastomeric blend during the mixing process while limiting the addition of materials sensitive to high temperatures (e.g. vulcanization system). As alternative filler, a by-product from industry was used, the so-called energy gypsum, which the effect of  on the vulcanization process has already been investigated by the authors. However, the direct effect of this alternative filler on the mixing process of elastomeric blends has not yet been studied. Using the Winmix program, which is used to directly record the magnitude of torque and temperature during the mixing process, the influence of the silica content and energy gypsum on the stated parameters of  elastomer blends mixing was studied. For systems with different ratio of the given fillers, their influence on rheological properties and vulcanization characteristics was also evaluated. The results of the study provide important knowledge about the influence of conventional and alternative fillers on the mixing process and vulcanization of elastomeric systems and in the future will serve to set and optimize the parameters of these processes. This research work has been supported by the Operational Program Integrated Infrastructure, co-financed by the European Regional Development Fund by the project: Advancement and support of R&D for "Center for diagnostics and quality testing of materials" in the domains of the RIS3 SK specialization, Acronym: CEDITEK II., ITMS2014 + code 313011W442.