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Due to its properties, polyurethane (PUR) has been widely used for many years for various machine and device components [12, 16]. Especially in recent years, thanks to the introduction of new PUR technologies with very diverse properties, there is an even greater interest in the usage of this material. Polyurethanes can be produced as foams, rubbers (cast, thermoplastic and rolled elastomers), varnishes, glues, fibers and leather-like materials, applicable in almost all areas of life and economy [14]. The polyurethanes are essentially obtained by reacting the polyesters or polyethers containing free hydroxyl groups (polyols) with diisocyanates together with added auxiliaries. The combination and mixing of these readyto-process components with auxiliary materials, such as, for example, catalysts, foaming agents, stabilizers, initiates a chemical reaction leading to the production of PUR. By changing the components and their proportions, one can adjust the properties of the resulting polyurethane, so as to obtain a material with the required stiffness or elasticity, suitable for specific, individual applications [12, 16]. Depending on the conditions of the reaction, the type and amount of components, products with different properties are obtained, e.g. polyurethane elastomers (EPUR) of different hardness [6, 14].

Effect of contact pressure and sliding speed on the friction of polyurethane elastomer (EPUR) during sliding on steel under water wetting conditions