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<p>[QUOTE=&quot;Daggarjon, post: 569858, member: 4230&quot;]I am getting tired of all these companies selling products that harm the coins and currency they are supposed to protect. Sellers saying the item is safe when its not. Sallers saying it archival safe, when its not. I am especially tired of seeing every product out there saying its used by the Smithsonian. How many products does the Museum use? I would think they would find the 1 or 2 that works, and be done. </p><p><br /></p><p>I looked through the Smithsonians website, and sent an email asking specificly which product they use. Hopefully they respond. </p><p><br /></p><p>I am just tired of trying to interpret what the seller is really selling. Im tired of trying to figure out what chemical is safe and which one is not. Mylar, Mylar-D, Prolar, Kodar, Melinex 516 ect, ect ect.... Im tired of second guessing whats safe and whats not. I spend years building a collection, and dont want it ruined because of a bad decision on storage. PVC is bad, Acetate is not good, is acrylic? What about triacetate?&nbsp; polystyrene? or what about SKC type SH72S?</p><p><br /></p><p>I know i do not have the ability to test all these materials. I am also not chemical engineer who can look at a spec data sheet and know off hand what paragraph A says about sub-section 93 of paragraph B. </p><p><br /></p><p>What i read on 1 chemical report back when i was researching currency sleeves, was that all Mylar-D is safe, while not all Mylar was. But from what i find on google for Mylar... Mylar and Mylar-D appear to be the same thing?!?!? and Mylar is PET... PET is what they make milk jugs out of, isnt it? Milk jugs are made from HDPE or high density polyethylene... guess what Mylar is ... polyethylene terephthalate. very close cousins i think....</p><p><br /></p><p>I just hope someone in the Smithsonian who has the knowledge shares it so we may all benefit. I know most of us have alot at stake choosing the right product.... and none of us wish to see green or black slime on our coins 20 years from now <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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