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<p>[QUOTE=&quot;Pavlos, post: 3356554, member: 96635&quot;]I synthesize and work with PLA daily and I got quite some years of experience with it. PLA is a wonderful plastic because there are so many variations of it, all plastics have that but PLA is a little more special because the lactic acid in the chain can be mirrored from eachother. PLLA (100% Levo-lactic acid) is incredibly strong, as it is very crystalline and it won&#039;t degrade at all under normal circumstances. However, the most commonly used PLA is 96% Levo-lactic acid and 4% dextro-lactic acid, the one used in 3D printing. It is mechanically weaker but I still doubt it will suddenly degrade, it is always possible under the right temperate and humidity. PLA is incredibly hygroscopic and quickly attracts water so much humidity is not even needed. PLA is definitely safe for coins but the question is, is lactic acid safe for the coins? I don&#039;t know what, but it is after all an acid. I still think polypropylene without additives is the most safe for coins.[/QUOTE]</p><p><br /></p>

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