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<p>[QUOTE=&quot;hontonai, post: 818404, member: 4703&quot;]I&#039;ve never heard of nylon 2x2s, but nylon is a very inert substance.&nbsp; I&#039;m no chemist, but it doesn&#039;t seem to me that there would be any problem.</p><p><br /></p><p>Mylar is chemically composed of oxygen, hydrogen and carbon.&nbsp; Nylon adds the inert gas nitrogen to the composition, so there is no reason to believe there would be the outgassing problem of pvc, which contains chlorine, a very reactive chemical.</p><p><br /></p><p>I&#039;ve also never heard of transparent nylon, so I&#039;m assuming that nylon replaces the cardboard, but the 2x2s still have mylar windows and it is the mylar, not the nylon, which actually touches the coin.[/QUOTE]</p><p><br /></p>

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