That means 8 out of 10 back pieces completed are not good enough to go to production for assembly on the phone. It takes three diamond polishing treatments and total of 25 days to complete the process, all at a meager yield rate of 20%. The material ends up achieving a hardness rating of 8.5 on Mohs Hardness Scale (diamonds rate a 10H). ![]() ![]() The back piece is fire baked at 2,700 degrees Fahrenheit (1,482C) for 28 hours, then cooled for two days, then thrown back into the fire. The back plate is crafted in zirconia, and the edges to the bezel are beveled instead of rounded. ![]() The OnePlus X Ceramic is something special.
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