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<p>[QUOTE=&quot;Kentucky, post: 1535644, member: 33176&quot;]I normally agree with Doug in all things, but the non-PVC flips seems odd to me.&nbsp; PVC or polyvinylchloride is not a good material to store many things in, including coins.&nbsp; PVC will decompose over time giving off hydrogen chloride gas which dissolves in water to give hydrochloric acid.&nbsp; Additionally after the decomposition, the degraded polymer that is left behind can gunk up the coins.&nbsp; Another strike against PVC is that it is always plasticized with materials that can leach out and dammage coins.&nbsp; Polyester (Mylar) seems to be the material of choice, at least for now.&nbsp; It doesn&#039;t have to be plasticized and is much more stable than PVC.&nbsp; Flips of polyester should be good, and even cardboard 2X2&#039;s which use polyester should be safe (this is what you will find in ~100% of coin shops.[/QUOTE]</p><p><br /></p>

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