Tribological assessments have been completed using a ball-on-disc T-11 tester. The balls have been product of metal, While the discs had been fabricated from steel, aluminium oxide, zirconium oxide, polyamide and poly(methyl methacrylate). The description on the machine and the procedures continues to be given from the literature (Szczerek and https://fernandoebriz.bloggin-ads.com/55350885/the-2-minute-rule-for-methylated-seed-oil