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We stock three different materials for frame backings:
• Long-term Display - Matboard - White, pH-neutral, buffered, 1/16" thick.
• Indefinite Display - Archival Conservation Board - White, acid & lignin-free, buffered board (.040" thick) for 8 x 10" thru 12 x 18" frames.
• Indefinite Display Archival Foam Board - White, acid-free, buffered, .125" (1/8") thick for 16 x 20" thru 24 x 36" frames. Both are Approved by the Library of Congress for indefinite display or storage (hundreds and hundreds of years).