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ENCLOSURES & SLEEVES
Use in conjunction with Side Loading Print Sleeves for optimum protection, and then store envelopes in our archival Document Box or our Drop Front Boxes, which are available in many sizes.
Balanced side seams sealed with pH-neutral adhesive on the outside provide a smooth inner surface. Seams are on the long sides to provide equal thickness in storage, which prevents file stacks from "fanning". 2-1/2 inch non-adhesive flaps are located on the short side. Constructed of heavyweight 7-point acid- and lignin-free card stock.
Note: Any envelopes you might find elsewhere or you are already using should not be used if they have center seams. Pressure on the seam from adjoining files will usually fall in the center of the contents and over time may cause damage. Archival Methods does not offer any archival envelopes with center seams.
ArchivalGrade Cardstock Specifications
Made from fully bleached, high alpha cellulose pulp. It does not contain any post consumer waste recycled pulp. Paper is free of metal particles, waxes, plasticizers, residual bleach, peroxide, sulfur content is less than 0.0008% reducible sulfur.
The lignin content is measured by the phloroglucinol test with a Kappa number of 5 or less.
Metallic Impurities, Iron will not exceed 150 ppm and copper shall not exceed 6 ppm. No optical brightening agents are used in the pulp.
The paper contains a minimum of 3% calcium carbonate (CaCO3) with a pH range 8-9.5
Alkaline or neutral sizing are used. No alum rosin or rosin sizing are used.
Color pigment dyes are light-fast and non-bleeding.
This paper passes the PAT (Photographic Activity Test) ISO 14523 formally ANSI IT9.16