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<p>[QUOTE=&quot;imrich, post: 1579673, member: 22331&quot;]<b>Simple Modifications/Procedures Would Allow Sealed Holder!!</b></p><p><br /></p><p><br /></p><p><br /></p><p>When I designed a production facility for sealed Fresnel lenses 40+ years ago, I used a robotic X-Y-Z servo driven table to apply a continuous bead of Silicone adhesive (in a controlled atmosphere) between the outer layers and the inner lens. This design allowed a hermetically sealed plastic lens relatively impervious to adverse outside conditions. I believe this technology is currently used with Ultra-Violet cured adhesives to produce the products to which you refer. </p><p><br /></p><p>The afore-mentioned process is acceptable for relatively &quot;short-lived&quot; commercial products. The mitigating application of adhesive is acceptable for products of the nature discussed, but probably isn&#039;t conducive for an acceptable precious coin seal, because of potential &quot;out-gassing&quot;, and longevity of adhesives. A labyrinth would need to be installed between the inside and outside surfaces to eliminate &quot;gas&quot; migration.</p><p><br /></p><p>There is a commercial product currently on the market, which I believe when minutely modified, applied in a controlled environment, and properly sealed would effect the desired seal. The seal could be generated through Ultra-Sonic bonding, and UV adhesive exterior application.</p><p>&nbsp;</p><p>I suspect that with proper procedures and a desiccant environment, a novice could also relatively inexpensively protect their coins at home with minimal effort. </p><p><br /></p><p>JMHO :thumb:[/QUOTE]</p><p><br /></p>

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