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<p>[QUOTE=&quot;Kentucky, post: 4959208, member: 33176&quot;]OK, I&#039;ll do some research, but off the top of my head...&nbsp; PVC is usually a stiff, brittle plastic, but materials called plasticizers can be added to the stock resin before it is made into sheets so they can be flexed.&nbsp; That material is often dioctylphthalate which is a non-volatile oily material which disrupts the polymer chains and lets them slip past one another.&nbsp; Now, some plastics are naturally flexible, such as PET (Polyester) and PE (Polyethylene).&nbsp; PET seems to be the choice for flexible coin products.[/QUOTE]</p><p><br /></p>

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