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<p>[QUOTE="calcol, post: 8020887, member: 77639"]In a high humidity location, your best way of keeping your coins in a dry environment is to use a desiccant that is replaced or regenerated when necessary … and don’t worry about the container composition … PP, LDPE, HDPE, acrylic, polycarbonate, glass, etc. Diffusion through these will be insignificant compared to what comes in at the seams or openings … including you periodically opening or closing the container.</p><p><br /></p><p>Note that 10 to the 10th multiplier for moisture permeability in Table 2. That means the actual value is the value stated multiplied by 0.0000000001! That means for even the most permeable plastic in the table, which happens to be acrylic, it takes a long, long time for moisture to get through any reasonable thickness. If you put a liter of water in a well-sealed container made of the above substances and put it in a near zero humidity environment, it would take many years for it to decrease in weight by even 0.01%.</p><p><br /></p><p>Avoid plasticized vinyl, but otherwise, don’t be concerned about the plastic you choose to protect your coins from moisture.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>
[QUOTE="calcol, post: 8020887, member: 77639"]In a high humidity location, your best way of keeping your coins in a dry environment is to use a desiccant that is replaced or regenerated when necessary … and don’t worry about the container composition … PP, LDPE, HDPE, acrylic, polycarbonate, glass, etc. Diffusion through these will be insignificant compared to what comes in at the seams or openings … including you periodically opening or closing the container. Note that 10 to the 10th multiplier for moisture permeability in Table 2. That means the actual value is the value stated multiplied by 0.0000000001! That means for even the most permeable plastic in the table, which happens to be acrylic, it takes a long, long time for moisture to get through any reasonable thickness. If you put a liter of water in a well-sealed container made of the above substances and put it in a near zero humidity environment, it would take many years for it to decrease in weight by even 0.01%. Avoid plasticized vinyl, but otherwise, don’t be concerned about the plastic you choose to protect your coins from moisture. Cal[/QUOTE]
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