Professional metal polishing is a thriving industry; one which companies such as Badger Anodising (Birmingham) Ltd actively engage in. In fact, without metal polishing, we wouldn’t see shiny back plates on smartphones, car rims that are almost as reflective as mirrors, and sturdy aluminium cookware. Various types of standard metal finishing techniques abound, each with its own set of perks and uses. One such technique is known as bead blasting, which is occasionally also used in materials such as tougher plastics. Bead blasting works due to friction—tiny beads of glass slowly chip away at impurities on the surfaces of materials being treated, resulting in a refurbished finish. Vehicle restoration is the most common application for this, but since then it has also branched out to refinishing metal toys and machines.
http://www.badgeranodising.co.uk/exploring-metal-finishing-techniques-the-basics-of-bead-blasting/
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