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This pack of 32 x 40" Natural White 4-Ply Museum Board from Archival Methods contains 15 boards that are 1/16" thick. The boards are designed for matting, mounting and preservation of fine prints, precious documents, as well as for traditional and digital photography. The 4-ply thickness is ideal for window mats and mat backing for small prints, creates a separation between artwork and glazing, and provides a flat, supportive backing.
The boards are acid and lignin-free and use alkaline or neutral sizing. No brightening agents are used and no yellow cast is present. All boards are buffered with calcium carbonate to ensure that a polluted environment won't cause paper's pH value to decrease with age.
Made from 100% Cotton fiber pulp (99% Alpha Cellulose) and does not contain any post consumer waste recycled pulp. The paper is free of metal particles, waxes, plasticizers and residual bleach peroxide. Sulfur content is less than 0.0008% reducible sulfur. Iron content does not exceed 150 ppm and copper does not exceed 6 ppm. No optical brightening agents are used in the pulp
Alkaline sizing is used for both internal and external sizing. No alum is used in the manufacturing process
Calcium carbonate buffered with 2 to 3% alkaline reserve
Acid-free (9.0 ± 0.5 pH level)
Light-fast and non-bleeding color dyes
Board passes the PAT (Photographic Activity Test) ISO 14523 (formerly ANSI IT9.16)
Lignin content is tested by TAPPI 236 cm-85 and has a Kappa number of less than five
Single ply sheets are laminated together using all natural starch adhesive