General informations II Non-ferric metals

These include: Copper, brass ( Copper – zinc), bronze ( Copper – tin), zamac ( zinc – aluminium), aluminium, chrome, nickel, gold, silver, etc. All of these are polished with either Tripoli compounds or aluminium oxide compounds, with cotton buffs. Shine is very important in these metals as they must have a perfect finish and sometimes they are coated. Aluminium polishing requires special treatment as this is a very soft metal with a very high friction coefficient. For polishing, a Tripoli or alumina compound is required with a high grease-content for lubrication purposes, and the metal must be applied to the buff at a very low pressure.Chrome is a special case as its hardness means that it must be polished with aluminium oxide compounds.