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<p>[QUOTE=&quot;desertgem, post: 3230183, member: 15199&quot;]There are plenty of documents that give &quot;which&quot; and &quot;reasons&quot; , if you want data , there is plenty on the internet. Polyethylene terephthalate, commonly known as mylar is the best for this as it is very transparent and low transmission. There are better to store metal from gases, but they generally are semimetallic and low transparency. here is a chart&nbsp; with gas and water vapor permeabilities.</p><p><br /></p><p><a href="http://www.alphap.com/bottle-basics/plastics-comparison-chart.php" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.alphap.com/bottle-basics/plastics-comparison-chart.php" rel="nofollow">http://www.alphap.com/bottle-basics/plastics-comparison-chart.php</a>[/QUOTE]</p><p><br /></p>

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