Pinit BACKINGS for Maps. 36 x 26-1/4". .040" thick Alpha-Cellulose board. Acid-free, Lignin-free, Buffered. Indefinite Storage. SKU: KAF403626 (0)No Reviews yet Add to Shopping Cart Details Conservation Grade Backings for Maps 36 x 26-1/4" .040" thick Alpha-Cellulose board. All white. Lignin-free. Acid-free. Buffered. Contaminant-free. ... Details Back DetailsConservation Grade Backings for Maps 36 x 26-1/4" .040" thick Alpha-Cellulose board. All white. Lignin-free. Acid-free. Buffered. Contaminant-free. Meets the Library of Congress archival standards.Indefinite Storage. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review