Question optical media and vapor acid

In MDisc DVD or DVD disc the metal layers are exposed and contact to the outside air and external environment in contact with any acid vapor or impurity?? Evaporation of hydrochloric acid and 70% trichloroacetic acid vapor this acids and impurities enter the disc through polycarbonate and glue?

Before anyone replies, be aware this is gamemaniaco
https://forum.videohelp.com/search.php?searchid=1867901
Been banned at VideoHelp a few times, and ther are fed up with him at DigitalFaq
Also look at
https://forum.videohelp.com/threads/394553-DVD-Media-structure#post2561996

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