Print & Poster SUPER ARCHIVAL BACKING BOARDS for our Polyester Sleeves.
Our Super Archival Backing Print & Poster Backing Boards are sized perfectly in our Polyester Sleeves. This material meets the Library of Congress archival standards. It is 100% alpha-cellulose, .040" thick, acid-free(alkaline pH 8.5), lignin-free, contaminant-free. It comes buffered with a 3% calcium carbonate buffer. Use for Indefinite Storage (hundreds and hundreds of years).