Tribological checks were completed employing a ball-on-disc T-11 tester. The balls have been manufactured from steel, whereas the discs have been made from steel, aluminium oxide, zirconium oxide, polyamide and poly(methyl methacrylate). The description with the machine as well as methods has long been offered in the literature (Szczerek and https://cicilb365taa1.blogripley.com/profile