100% Archival Backing Boards for Newspapers
Our conservation grade SUPER ARCHIVAL BACKING BOARD 
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-term storage (hundreds of years).
BACKING Boards for Flat Newspapers
Conservation Grade Backings for FLAT Newspapers
15-5/8 x 23-1/4"  .040" thick Acid-Free & Buffered Board.
Indefinite Storage.

Base SKU:kaf40np1623