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<p>[QUOTE=&quot;desertgem, post: 3358258, member: 15199&quot;]Somewhere on a container, there should be a little triangle with arrow points and a number like the one below.&nbsp; </p><p>[ATTACH=full]889626[/ATTACH]</p><p><br /></p><p>Although 1,2,4,5 are considered safe, I&nbsp; would not use #4 because of its structural weakness and usually opaque. Most prefer #1 (trade name&nbsp; mylar),&nbsp; for sheet like use,&nbsp; (Flips, and such), but I wouldn&#039;t use if the coin will be frequently removed due to possible micro scratches. #2 is more rigid and used for stiffer ( usually colored) containers, and #5 is also considered&nbsp; chemically inert. Over time, if stored in harsher environments, such as large variations in temperature, most can deteriorate over long term. Some coin tubes I have are stiff mylar transparent bottoms with a HDPE flexible top. Any holder ( most) that has an opening ...flips, tubes or holders with a reversible seal , sonic seals if handled often ( slabs) , can develop problems from air entering microscopically....That is why desiccator devices to remove moisture from storage , ion scavengers such as the sacrificial zincolns , and multiple stage bagging with both are required for very long term storage.&nbsp; If you want more details on the various acronyms such as PETE, there are many sites and details on the web. IMO, Jim</p><p><br /></p><p>p.s. It helps to live in a desert area <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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