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<p>[QUOTE=&quot;desertgem, post: 1317677, member: 15199&quot;]If it is truly a mylar&nbsp; [polyethylene terephthalate ] film , either as a clear plastic 2x2 flip or as the inner film of a cardboard 2x2, it is considered archival and unreactive to coins and paper material. There are some PVC flips that are not mylar but are a vinyl with lesser amounts or lesser active plasticizer agents. These generally are considered much better than the regular soft PVC plastic holders, and are usually safe in low or medium range humidity/reactive chemicals in the air. In high humidity, sulfurous or acid air, mylar or hard plastic is better. The commercial air-tite ( tm) or TPG slabs are safe as mylar. </p><p><a href="http://en.wikipedia.org/wiki/Polyethylene_terephthalate" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Polyethylene_terephthalate" rel="nofollow"><br /></a></p><p><a href="http://en.wikipedia.org/wiki/Polyethylene_terephthalate" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Polyethylene_terephthalate" rel="nofollow"></a>[/QUOTE]</p><p><br /></p>

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