The friction and wear properties of gray cast iron (FC250) specimens sliding against AISI 52100 steel ball were evaluated under the lubrication of PAO (poly-alpha-olefin). PAO+ZnDTP (1. 5 mass% ZnDTP) and PAO+PN (amine salt of alkoxyl phosphate. 1. https://cosmeticssquadets.shop/product-category/bracelets/