Tribological assessments were carried out using a ball-on-disc T-11 tester. The balls had been manufactured from metal, Whilst the discs were fabricated from steel, aluminium oxide, zirconium oxide, polyamide and poly(methyl methacrylate). The outline of the unit and the procedures has long been specified from the literature (Szczerek and Tuszyński https://hafizb802vpc3.blog-gold.com/profile