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<p>[QUOTE=&quot;clayirving, post: 667634, member: 18867&quot;]Options are a good thing - That&#039;s why I ended my last posting with, &quot;<i>you may find the currency slabs work just fine.</i>&quot; So, whatever your preference, know what material the currency holder, slab, or sleeve is made from. These materials have been classified as fine for archival storage:</p><p><br /></p><ul> <li><b>Polyester</b> - <i>Example</i>: SuperSafe or holders made from Prolar Polyester</li> <li><b>Polyethylene (food grade)</b> - This includes Polyethylene terephthalate (PET), <i>Example</i>: SafGard. Also includes &quot;Mylar&quot; or other biaxially-oriented polyethylene terephthalate polymers. <i>Example</i>: Frame-A-Coin Currency Holders, PCGS Currency Holders are &quot;Mylar D&quot; (See: <a href="http://www.coinlink.com/News/general-collecting/pcgs-currency-holders-%E2%80%9Ctake-the-heat%E2%80%9D/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.coinlink.com/News/general-collecting/pcgs-currency-holders-%E2%80%9Ctake-the-heat%E2%80%9D/" rel="nofollow">PCGS Currency Holders &quot;Take the Heat&quot;</a>)<u><b><br /> </b></u></li> <li><b>Polystyrene</b> - <i>Example</i>: BCW Currency Slabs</li> <li><b>Polypropylene</b> - <i>Example</i>: UltraPro Banknote Holding Ring Binder Display Pages</li> <li><b>Plexiglas</b> which is a trade name for Poly(methyl methacrylate) (PMMA). It is sold under many trade names, including Policril, Plexiglas, Gavrieli, Vitroflex, Limacryl, R-Cast, Per-Clax, Perspex, Plazcryl, Acrylex, Acrylite, Acrylplast, Altuglas, Polycast, Oroglass, Optix and Lucite and is commonly called acrylic glass, simply <u>acrylic</u>, perspex or plexiglas. So, &quot;hard acrylic&quot; holders should be ok. <i>Example</i>: Collector Safe, Capital Plastics Currency Holders, Image Guard Currency Holders</li> </ul><p>I would be suspicious of anything generically called &quot;plastic&quot;, &quot;acetate&quot;, &quot;vinyl&quot;, or &quot;PVC&quot; (even if the PVC contains no plasticizers or stearates) holders. Sometimes, though, with a little research, you may find the &quot;hard plastic&quot; currency holder is made of acrylic or polystyrene, which should be fine.[/QUOTE]</p><p><br /></p>

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