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<p>[QUOTE=&quot;Numbers, post: 808029, member: 11668&quot;]I&#039;m not entirely sure I&#039;ve got all of this right, but I think it&#039;s the general idea:</p><p>&nbsp;</p><p>Mylar and its friends are actually rather hard plastics.&nbsp; The Mylar holders have to be thin, or else they&#039;d be too stiff to get the note in and out.</p><p>&nbsp;</p><p>Adding PVC to the plastic makes it softer.&nbsp; That way, the holders can be made thicker while still being usable.&nbsp; Thus the PVC holders provide better physical protection during shipping, which is why dealers use them.</p><p>&nbsp;</p><p>But, PVC isn&#039;t the most stable thing in the world.&nbsp; So if you leave the note in a PVC holder for a long time, there&#039;s a potential that the PVC could leach out and damage the note chemically.&nbsp; Thus the non-PVC holders provide better environmental protection over the long term, which is why collectors are advised to use them.</p><p>&nbsp;</p><p>(Somebody correct me if I&#039;m mangling this explanation too badly....)[/QUOTE]</p><p><br /></p>

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