Single pocket sleeve for postcards or flat pack proof sets. Made in USA
>Archival quality, heavy duty inert plastic. The Best Made
We certify that all sleeves are made from film that adheres to the Library of Congress Spec. 500-500, "Polyester Film for the Storage of Artifacts". The film was also tested an approved in the "Photographic Activity Test" (PAT)), ISO 18916. This is the best quality film produced in the USA
This film is acid-free and there are no internal additives such as plasticizers, antioxidants, slip agents, anti-block agents, or UV inhibitors, all of which can migrate into stored materials. This film is completely inert.