Tribological exams have been completed using a ball-on-disc T-11 tester. The balls had been made of steel, whereas the discs had been made from steel, aluminium oxide, zirconium oxide, polyamide and poly(methyl methacrylate). The description of the machine as well as the strategies has become specified within the literature (Szczerek https://geraldi493rah7.wikimidpoint.com/user