These 2 mil and 4 mil Print & Poster Sleeves are made of Museum Grade Archival Polyester (Mylar), an inert material of the highest clarity.
• Polyester will not discolor, damage, or adhere to items placed
inside it. It is a sturdy film that will give extra support to fragile
• Use polyester (Mylar) to ensure your collectibles remain in
excellent condition for years to come. Polyester is used worldwide in
museums, libraries and archives. Our polyester material is approved by
the Library of Congress for archival storage. We use DuPont inert
Melinex® or a suitable equivalent. For custom sizes, call for quote. Low minimums.