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<p>[QUOTE=&quot;ageka, post: 22665, member: 1485&quot;]I followed a similar discussion on a German board between chemists</p><p>( I am a chemical engineer so I could follow the discussion somewhat )</p><p><br /></p><p>PVC is a plastic(polyvinylchloride) like PE ( polyethylene ) and PP </p><p>( Polypropylene ) and ABS ( Acrylobutadienestyrene ) and PS </p><p>( polystyrene ) etc .....</p><p><br /></p><p>PVC gets brittle with age and therefore a product was added called plasticiser which kind of oils the PVC but which can leach out and attack especially silver ( do not ask me why ) and therefore the concensus was to dip any new acquired coin in acetone ( this will remove the plasticiser)</p><p>Some people also claimed that some of the chlorine could attack copper and give copperchoride which is green rot on coins</p><p><br /></p><p>So you want a flip or plastic without plasticiser and I guess preferably without chlorine</p><p><br /></p><p>At the bottom of attached link you will find a lot of other plastics</p><p>I think 2X2 holders are Mylar and airtites and the like are acrylics</p><p>I do not know what present day flips are made off but I am sure they left the plasticiser out at least</p><p><br /></p><p><a href="http://www.psrc.usm.edu/macrog/pvc.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.psrc.usm.edu/macrog/pvc.htm" rel="nofollow">http://www.psrc.usm.edu/macrog/pvc.htm</a></p><p><br /></p><p>You can read a lot about coinholders at following site</p><p><br /></p><p><a href="http://rg.ancients.info/guide/holders.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://rg.ancients.info/guide/holders.html" rel="nofollow">http://rg.ancients.info/guide/holders.html</a>[/QUOTE]</p><p><br /></p>

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