Acid Free Foam Board: "Acid Free Foam Board, 2/Pkg."
This foamboard provides an acid-free surface with a 5mm chemically inert core for mounting artwork, photographs and important documents. The facing paper on both sides of the board has a pH between 7.7 and 8.5 and is buffered to protect from pollutants. They come in a pack of two 20" x 30" foamboards.
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