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<p>[QUOTE=&quot;Kentucky, post: 1521197, member: 33176&quot;]Close, PVC stands for PolyVinylChloride, which is a clear plastic that is actually very hard, but can be made soft and pliable by adding a plasticizer.&nbsp; The plasticizer could damage the coins, and the PVC will decompose with age, releasing HCl (Hydrogen chloride gas which makes hydrochloric acid when dissolved in water) which can damage your coins.&nbsp; Polyester is used to make flips since it is pliable even when not plasticized.&nbsp; The coin is put in one side and paper with information can be put in the other side.&nbsp; I noticed in one of your pictures that Preston also has some 2x2 foldovers.&nbsp; These are of course used to sandwich the coins and the plastic here is pretty much always polyester.&nbsp; One thing that I have done that I am sure people will criticize is to sandwich a coin in a foldover 2x2 and put it in an album page without stapling it.&nbsp; This allows the coin to be easily removed from the 2x2 but still keeps it protected.[/QUOTE]</p><p><br /></p>

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