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<p>[QUOTE=&quot;GDJMSP, post: 1009339, member: 112&quot;]They do not to my knowledge. In fact at one time they even offered what they promoted as being their new &quot;airtight&quot; slab - this was some years back. It supposedly solved the problem of coins turning the slab. </p><p><br /></p><p>But then it was pointed out in the various coin forums that the plastic used in the slabs is not truly airtight - regardless of how good the seal around the edge is. The plastic itself is permeable. Since then, I cannot recall any mention of &quot;airtight&quot; slabs.</p><p><br /></p><p><br /></p><p>&nbsp;</p><p>I would agree. Because of the nature of the process used to seal the slabs, the sealing affects the slab all the way around. It&#039;s not like spot welding with metal. The plastic itself on the edges is actually melted by sonic waves. And that is what does the sealing. But any slab there is, regardless of brand, is not airtight nor watertight. Place any slab under water for a period of time and when you take it out there will be water inside it.</p><p><br /></p><p>It is worth noting however that I have never even heard of a documented case where a slab has been tampered with - meaning opened, the coin replaced - and then resealed in such a way that it was not readily apparent to even the newest novice.[/QUOTE]</p><p><br /></p>

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