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<p>[QUOTE=&quot;Cherd, post: 1430498, member: 24754&quot;]I can&#039;t say that I&#039;m an expert on fireproof safe rating procedures. But, ratings are usually estimated using the most extreme conditions that can reasonably be expected to occur. So, the 350 F rating is an internal temperature that will be reached if the safe is exposed to the absolute maximum temperature (over a conservatively long period of time) that can reasonably be expected to occur during a typical house fire. If your safe is subjected to a house fire, the actual conditions around the safe will most likely fall a good bit short of these maximums. Therefore, the internal temperature would probably be significantly less than 350 F. I would think that hard plastics should be OK, or at least not suffer a reaction that would cause damage to the coin. In any case, when it comes to fire protection a fireproof safe is the best option that is readily available for home use. So, even if they don&#039;t work under all conditions, there aren&#039;t any other options that will (options within reason anyway).</p><p><br /></p><p>The easiest way to test temperature effects would be to find a slabbed coin that you don&#039;t mind destroying, put it in the oven, and increase the temperature until you start seeing an effect. Of course, the potential effects of gas released from the plastic may not be readily apparent at lower temperatures. Depends on how scientific you want to get.[/QUOTE]</p><p><br /></p>

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