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These POLYESTER NEWSPAPER SLEEVES are made from 4mil archival polyester that has been approved by the Library of Congress for long-term storage. We use DuPont inert Melinex® or a suitable equivalent. This material has passed the Photo Activity Test (P.A.T.) which means that this material will not cause deterioration or harm to items stored in it.Polyester is a sturdy, crystal clear material with a glass-like surface and archival properties that are approved by museums for indefinite storage (hundreds of years).