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ENCLOSURES & SLEEVES
Designed for long-term storage of sheet film format negatives, transparencies and contact photographic prints. Use with Interleaving Folders for safe handling and protection from dust and other pollutants, then store in archival boxes such as our Hinged Lid or Short Top Boxes.
Constructed with double edge seams. This design ensures that envelopes stack perpendicular rather than in a “fan” shape, which can occur with conventional envelopes. Seams are bonded with pH-neutral adhesive on the outside to provide a smooth inner surface. The open end has an 1/8 inch lip for easy access to contents. Constructed of heavyweight 7-point acid- and lignin-free card stock in a rich cream in color.
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
Envelope category orders are combined in cart and recalculated at checkout for lowest pricing level.