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  Outgassing: Problems Arising Out Of Thin Air Some plastics can absorb moisture from the air.  These materials fall into the category called “hygroscopic plastics”.  The best known product in this group is  polycarbonate . It’s not, however, the only  hygroscopic  plastic. Nylon and polyester can also absorb water vapor. Water vapor isn’t the only substance that polycarbonate sheet can absorb.  Researchers have discovered that polycarbonate can also become saturated with oxygen.  While absorption of moisture and oxygen isn’t always a problem, it can be, especially when you are decorating the sheet with vinyl graphics. As the plastic outgases, bubbles can form under the applied vinyl graphics.