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<p>[QUOTE=&quot;Niel, post: 715774, member: 13422&quot;]DaggarJohn,</p><p>Thanks for posting this info. </p><p>Don&#039;t let your toes get your feet tangled. Think of the Mylar confusion this way.</p><p>Mylar, Mylar-D and Prolar are brand names of a particular plastic composition (PET, as you mentioned earlier) just as Jello is a brand name for gelatin. You can get Cherry or Black Cherry Jello. They look similar, but have very different tastes due to differences in additives to the gelatin, namely flavoring. Tastee also makes Cherry gelatin and it tastes slightly different than either of the Jello brand gelatins. If Tastee made a cherry gelatin that tasted exactly like Jello, I&#039;m sure there would be a patent or trademark violation lawsuit.</p><p>So it is with plastics.</p><p>The base material PET is &quot;relatively inert&quot; according to everything I&#039;ve read and researched as well. The issue is when different manufacturers add stuff to or modify the composition of the PET very, very slightly to shield themselves from various patent/trademark infringement, does that harm or change the &quot;Inert&quot; status of the PET.</p><p>I don&#039;t have the answer, no one probably does as these formulations are no doubt trade secrets (same as the formula for Coke, Pepsi and Tastee Black Cherry gelatin.)</p><p>However, since one of the &#039;selling points&#039; of PET is it&#039;s inherent Inert property (which has uses in industry far beyond our specific interest in it for storage), I would suspect that whether it&#039;s Mylar, Mylar-D, Prolar or Tastee Plexi pack (jk), they all are essentially Inert and therefore useful for Archival storage of our precious collectables.</p><p>JMHO, YMMV.</p><p><br /></p><p>I do recall Coinworld having some in depth articles on archival storage. If I can, I&#039;ll dig around online to see what may be archived there.[/QUOTE]</p><p><br /></p>

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