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This is a big question and a major technical issue for materials scientists and engineers. The short answer is: there are no truly scratch-proof plastics. Plastic is intrinsically soft material, because it is carbon/petroleum-based. Most minerals (rocks, glass, etc) will easily scratch plastic because they are made of metal oxides, which are intrinsically hard materials consisting only of metal-oxygen bonds. When it comes to scratch resistance, a harder material can always scratch a softer material. So no matter what plastic you have, there will always be a harder material out there that can scratch it, such as diamond, alumina, or zirconia.

Some plastics are more scratch-resistant than others, however. Examples of scratch-resistant plastics include polycarbonates, CR-39, polyurethanes, and PTFE. Any plastic can be made more scratch-resistant by applying a scratch-resistant coating, which can be composed of any number of highly engineered silicone resins, epoxies, acrylates, etc which can be thermally or UV-cured. There are hundreds of brand names for scratch-resistant coatings that advertise varying levels of abrasion resistance; many use a steel wool test to define just how scratch resistant the cured coating is.

Hope this is along the lines of what you wanted to know.

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