Gilman Acid Free Foamboard 32x40 3/16" (25/box) F3240/16 white Created for conservation mounting and framing, Insite® Reveal acid-free mounting boards deliver two-sided protection from damaging pollutants and harmful gases. Offers a pH
3/8" White Acid Free Buffered Foam Core Boards : 32 x 40 - BOXFORLESS.COM