Polypropylene Vs. Polyester

Archival polyester is free from any surface coatings and is preferred by conservators. It is chemically inert and won't react with or cause damage to items it comes in contact with. The same holds true for polypropylene and polyethylene. Plasticizers give plastics their various soft or flexible properties. The strong odor emitted from a new shower curtain comes from plasticizers and is a telltale sign of polyvinyl chloride (PVC) which is not an archival plastic. Avoid enclosures made from this material. They can cause damage to your valuable collection.
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