Tribological checks were performed employing a ball-on-disc T-11 tester. The balls have been fabricated from steel, whereas the discs have been fabricated from steel, aluminium oxide, zirconium oxide, polyamide and poly(methyl methacrylate). The description of your unit as well as the procedures is specified from the literature (Szczerek and Tuszyński https://georgesh058dkq0.daneblogger.com/profile