For example, the crystal-clear plastics Plexiglass and polycarbonate are much stronger than glass, but also more sensitive to scratches. Plastics that are usually used in visual applications where their appearance is important, are supplied from the factory with a protective film. Industrial plastics for which this does not apply, or to a lesser extent, and whose surface is still being processed in most cases, do not have a protective film. There may be minor scratches as a result of sliding in the production process or during transport from the manufacturer. That is almost never a problem, but it is good to know and to take into account.
