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<p>[QUOTE=&quot;GDJMSP, post: 2844947, member: 112&quot;]Thermoplastic Rubber - TPR - is for the most part an inert material. But if exposed to ultraviolet radiation or direct sunlight it can degrade considerably. If it did, that could very well be bad for the coins.</p><p><br /></p><p>The other materials used in the cases you ask about seem to be just fine. But understand this, even though these cases may be watertight, they are not airtight. And air is the primary enemy of all coins. So while using these cases may help with your coin storage issues, they are not going to solve all problems. In fact you would probably be just as well off using Tupperware containers, and for a lot less money.[/QUOTE]</p><p><br /></p>

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