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I read somewhere a few months ago that polishing hesalite (Polymethyl methacrylate) or acrylic crystals can release harmful gasses and this is one of the reasons official service centres replace crystals rather than polishing them.
Now, I don’t particularly believe this to be true and assume it much more likely to be because changing a crystal is quicker than removing, polishing and refitting. Also, from my very basic knowledge of hesalite if there were any risks they relate to the raw…
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