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The 22 x 28" Archival Methods 1/8" Acid-Free Foamboard contains 10 lignin-free boards designed for picture frame backings. Its 1/8" thickness is suitable for use with all frame profiles and allows you to create a framing package of less than 3/8" even when glazing and mat boards are used. The board is suitable for archival use thanks to its acid-free surface and a 3% buffering agent which maintains an alkaline pH level.