11x8.5 Polyester 3-Hole Sheet Protectors - 10 Pack

These folded sheets feature the superior clarity of polyester and a thick, black liner sheet, making them the highest quality polyester sheet protectors on the market today. Ideal for multi-ring portfolios and 3-ring binders, all formats are top and bottom loading. Available in 5 standard formats, all of which are compatible with other major brands of portfolios including those by Prat, Angler's Roslyn and Martin Weber. Made of archival grade DuPont polyester (polyethylene terephthalate), these sheets have high transparency and tensile strength, are non-yellowing at ambient temperatures, are chemically and dimensionally stable and are resistant to most chemicals, moisture and abrasion. A non-stick finish prevents adhesion to your artwork. Approved by the Library of Congress for archival storage. 10 pt. black acid-free and lignin-free paper. Both plastic and paper pass the Photographic Activity Test (PAT) and meet all ANSI requirements for archival storage. Packed in tens in a protective, resealable bag.