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  1. MUSEUM Mat Board 100% Cotton Rag Bright White 5X7 4-Ply 5pk

    • Availability: 

      In stock

    • Sku: PRP40425
    $7.95
    • 100% cotton fiber pulp (99% alpha cellulose). It does not contain any post consumer waste recycled pulp. 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 150ppm and copper does not exceed 6ppm. 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.
    • Buffered with calcium carbonate 2 to 3% alkaline reserve; pH 9 ± 0.5; and acid-free.
    • Color dyes are light-fast and non-bleeding.
    • Pass 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 5.
    • The single ply sheets are laminated together using all natural starch adhesive.
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