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<p>[QUOTE="Kentucky, post: 3130287, member: 33176"]Quibble...most plastics are not THAT air permeable, otherwise we would let babies play with dry cleaners bags. Some are more permeable than others. I think polyethylene is pretty permeable with polyester (seems to be preferred for coin applications) being less so. Hard plastic is often polycarbonate and is much thicker than flips or 2x2's. I still would like someone to start marketing polyvinylidine chloride for these applications. About as good as you can get for low gas permeability.[/QUOTE]</p><p><br /></p>
[QUOTE="Kentucky, post: 3130287, member: 33176"]Quibble...most plastics are not THAT air permeable, otherwise we would let babies play with dry cleaners bags. Some are more permeable than others. I think polyethylene is pretty permeable with polyester (seems to be preferred for coin applications) being less so. Hard plastic is often polycarbonate and is much thicker than flips or 2x2's. I still would like someone to start marketing polyvinylidine chloride for these applications. About as good as you can get for low gas permeability.[/QUOTE]
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