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<p>[QUOTE=&quot;-jeffB, post: 2791603, member: 27832&quot;]I just spent a little time trying to find out about the plastic that comes with the machine, but without much luck. There are plenty of heat-sealable plastics that <i>are</i> safe for coins -- Mylar would work great -- but that&#039;s probably not what they ship with the machine. Polyethylene is more likely, and that&#039;s probably safe as well, but doesn&#039;t block oxygen or other gases all that well. And if they use the wrong plasticizer when they&#039;re manufacturing the bags, all bets are off.</p><p><br /></p><p>Also remember that when you&#039;re heat-sealing a coin into a bag, you&#039;re not only sealing out the outside air, you&#039;re sealing <i>in</i> whatever&#039;s already on the coin or in the bag. If I were in a trolling mood, I&#039;d recommend thoroughly cleaning your coins and baking them dry before sealing them. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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