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Polishing? Metal finishing? What's the Difference?

Everyone knows the satisfying feeling of peeling the familiar blue protective film from a long-awaited new product and seeing its flawless, glossy plastic or metal surfaces for the first time.

• When most people hear the word polishing, they imagine a cloth, a polishing compound, or perhaps the chrome parts of a motorcycle. But what does it actually take to make a stainless-steel component, a brass door handle or a chrome-plated part shine brilliantly? Or to give a plastic component—such as a car headlamp lens or the back cover of a mobile phone—a flawless, mirror-like finish?

While polishing a motorcycle component or a brass door handle belongs to the field of decorative metal finishing (which, until not so long ago, was recognised as a separate trade), precision polishing is much more closely associated with the toolmaking profession.

• In decorative metal finishing
• the polished metal component itself is the finished product.
• Every single part must therefore be polished individually, which explains why such products generally belong to a higher price category. Likewise, chrome-plated components are polished before the plating process itself. In other words, polishing is also an essential part of decorative metal finishing. The confusion simply arises because the name of this traditional trade has gradually disappeared from everyday use.

In plastic injection moulding, however, these methods simply would not be suitable.

• The plastic, however,
• perfectly reproduces the surface of the mould during the injection moulding process. It follows the mould so precisely that even the tiniest scratches on the steel surface—far too small to be seen with the naked eye—will be reproduced on the plastic part. In other words, the plastic surface will faithfully replicate the surface of the mould in which it was formed.
• Have you ever examined a chrome-plated component under magnification?
• In precision polishing, we often work under a microscope. In many respects, our work begins where decorative metal polishing ends: carefully refining surfaces that already appear perfectly mirror-like to the naked eye.
• This illustrates that polishing is actually a collective term covering several highly specialised disciplines. Depending on the industry, these disciplines differ considerably in their techniques, equipment and the level of expertise they require.
  The tools used in precision polishing are, in many respects, comparable to those found in a dentist's practice, and even large surfaces are finished through meticulous, highly controlled manual work. This is the field in which I can assist you.
  Decorative metal polishing, on the other hand, focuses primarily on improving the appearance of finished products and relies on larger, fundamentally different types of equipment that I do not use.