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I know they're made of polypropylene but I'm not sure if that contains the dreaded pvc. Maybe one of our chemists will drop in...
There is no PVC (polyvinylchloride) or chlorine in polypropylene. Those two are separate compounds made from different bases. Polypropylene is considered a stable, relatively inert substance that does not break down easily or exude noxious substances over time. Your coins are safe, unless the containers are exposed to too much heat.