Alternative fillers, such as wood flour, ash, glass sludge and carbon black from pyrolysis of waste tires, are increasingly being used in polymer materials as substitutes for traditional fillers. These materials offer an ecological alternative that not only helps reduce environmental impact but also lowers the cost of polymer production. This paper focuses on the characterization of various types of alternative fillers and their incorporation into elastomeric rubber blends, examining their influence on selected rheological and mechanical properties. The results show that the correct choice of filler and its concentration can significantly affect polymer properties such as tensile strength, hardness, elasticity, and reinforcement. The best results in the experiment were achieved with rubber blends containing wood flour and carbon black from pyrolysis of waste tires. These rubber blends showed improved mechanical properties such as tensile strength and hardness. They also provided better rheological properties, which resulted in better processability and material homogeneity compared to blends containing other types of alternative fillers. Depending on the type of filler, polymer materials can achieve the desired mechanical, rheological, and environmental properties, opening new possibilities of the sustainable development of materials for various industrial applications.

Acknowledgement: This work was supported by the Science Grant Agency - project VEGA 1/0265/24 and by the Operational Program Integrated Infrastructure, co-financed by the European Regional Development Fund by the project: Advancement and support of R&D for "Centre for diagnostics and quality testing of materials" in the domains of the RIS3 SK specialization, Acronym: CEDITEK II., ITMS2014+ code 313011W442.