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<p>[QUOTE=&quot;desertgem, post: 2414145, member: 15199&quot;]Tommy, there are PVC products that are always of concern for long term storage. There is PVCA&nbsp; ( polyvinylchloride) Acetate which are stiffer but still transparent since they have modified and lesser amount of plasticiers. Some of the newer vinyl shower curtains I see in Walmart from China are&nbsp; made of this to eliminate the odor and cracking, and some coin holders, flips, and such are also made from these and many suppliers say they are &quot;safe&quot;, then there are the transparent, stiffer, but flexible holders made from other plastics ( such as mylar (tm)) without plasticizers, which are the safest, but if the folder has high acidity cardboard or paper, or is stored in the same enclosed space as such, with high moisture, problems can still occur with the latter type over a period of time. Even if a coin is stored vacuum sealed in a safe plastic material, environmental gases can diffuse ( slowly) in.</p><p><br /></p><p>If a person lives in a low humidity, low environmental gases such as Yucca valley, CA. , and checks their coins in PVC flips regularly, I would expect they would end up better than if they lived in wet Penna., with industrial smoke/smog, coins in something-Tite or P*** slab, but never checked them. Sacrificial copper coins scatter about the safe or cabinet will let you know when conditions are going bad. My opinion of course.[/QUOTE]</p><p><br /></p>

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