Gilman Acid Free Foam Board 48 x 96 x 3/16th 25 Sheets

InSite® Acid-Free Foam Board – Preservation-Grade Backing from Gilman Brothers

InSite® Acid-Free Foamboard is built for the high-end requirements of preservation mounting and framing. A polystyrene foam core sits between two sheets of acid-free paper, giving photographers, artists, and framers a backing that helps protect valuable work whether it is on display or in long-term storage.

Why framers and photographers choose InSite®

• Acid-free paper liners, two mounting surfaces. Both facers are free from damaging pollutants and harmful gases, so either side can take your adhesive or artwork.
• PAT compliant. Meets the Photographic Activity Test standard for safe contact with photographs.
• Buffered to stay acid-free longer. Liners carry pH values of 7.5 to 9.5 with a 3–5% calcium carbonate reserve.
• Clean pulp. The liners are 100% high alpha cellulose virgin pulp — no ground wood, no post-consumer material.
• Warp-resistant Reveal® foam center. Engineered to hold its thickness through mounting, so boards stay flat and true.

Ideal uses

Preservation mounting and framing, long-term display and storage, fine art, photography, and any application where the backing must never contaminate the piece it supports.

Specifications

• Brand: InSite® by The Gilman Brothers Company
• Color: Natural White
• Thickness: 3/16 inch
• Sheet sizes: 24" x 36" up to 48" x 96" (custom cutting available — see our Custom Cuts page)
• Core: Polystyrene foam (Reveal®), paper facers
• Acid-free: Yes — pH 7.5–9.5, buffered, PAT compliant
• Made in: USA

Need sheets cut to size? Visit our custom cutting page for a quote.