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<p>[QUOTE=&quot;clayirving, post: 1557964, member: 18867&quot;]The Polyvinyl Chloride (PVC) polymer is made with chlorine and ethylene gas. The resulting polymer is white, brittle powder. To make it into a currency sleeve, requires additives including heat stabilizers and plasticizers. Heat stabilizers are required because PVC to prevent loss of hydrochloric acid as the PVC degrades. Heat stabilizers are usually some type of metal derivative. The plasticizers are oily substances called phthalates. The plasticizers are mixed with PVC to soften it, but the plasticizers don&#039;t form chemical bonds with the PVC — They exist as a mixture with the PVC.</p><p><br /></p><p><br /></p><p>PVC is not recommended for archival storage because the additives may leach from the PVC over an extended period of time. If plasticizers are not added to PVC, then the PVC may be ok for archival quality plastic. Unplasticized PVC products will be hard plastic sleeves or containers.</p><p><br /></p><p><br /></p><p>Polymers recommended for archival storage such as Polyethylene Terephthalate (PET) are strong, thermo-stable and transparent. These type of polymers are also used for food storage because there is a minimal amount of transfer of substances in the plastic and the food.[/QUOTE]</p><p><br /></p>

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