The results of the analysis of the influence of the content of elemental admixtures in hyperelastic materials on their mechanical properties were included in this paper. Rubber-based materials are often used in engineering practice. However, modelling these materials is a complex and time-consuming task. The aim of the research described in this paper was to demonstrate the relationship between the content of admixtures of elements from groups of hyperelastic materials of different hardness and tensile strength. The samples for testing were selected in a way that allowed testing of a wider group of incompressible materials. The tests proposed in the work included sample preparation and determination of the hardness of rubbers of selected groups. The first stage of the work included testing the chemical composition of selected rubber types in order to determine the concentration of admixtures. The next stage included conducting uniaxial tensile tests. The results of the comparative analysis were presented in a graphical and descriptive manner. The work showed that the level of element admixtures has an effect on the mechanical properties of hyperelastic materials.