Elmer's Bienfang 100%
Cotton Rag Foam Board 32"x40"x3/16"
When archival quality mounting is
needed, this specialty Foam Board gives a commanding
performance. Its facing paper on each side has a pH of 8.2 +/- .5 and a
calcium carbonate buffer. Constructed with pure, naturally white cotton
fibers, this Foam Board contains no lignin, alum or harsh chemicals.