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<p>[QUOTE=&quot;RickieB, post: 806516, member: 2486&quot;]mpcusa...</p><p><br /></p><p>Valspar a World Leader in barriers has a nice summary about the gas permeability of PET (Mylar-D)...as I mentioned when viewed under high magnification it appears to be like matted fibers of felt or cross stitched/woven patterns that has cavities and pockets for molecular transfer or what is called OTR (Oxygen Transfer Rate).</p><p><br /></p><p>Oxygen is an oxidizer and must react with other molecular agents to induce damage. The most common sources are CO2 (which in certain arrangements acts as a mild acid), Acids, Humidity (moisture),Temp and a whole host of other agents.</p><p><br /></p><p>Is it the best we have at the moment for Archival Storage? Well general census says yes..but there have been <u>no long term data </u>on this as of yet.</p><p><br /></p><p>Again, food for thought.</p><p><br /></p><p>RickieB[/QUOTE]</p><p><br /></p>

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