Special Features:

Finish: vellum; paper grade: specialty papers; opacity: 83 nom.; caliper: 5.7 nom.; smoothness: 300 nom.; envelope size: no. 10; acid free; archival quality; five hundred (500) envelopes per pack; five packs (totaling 2, 500) shall be packaged in a carton in accordance with normal commercial practice; basis weight: 60 lbs nom. (text-offset)

Properties:

An envelope, usually made of a paper product. The face may be plain or preprinted with or without an open or glassine address window. The closure may be a gummed flap or a button and string fastener. When required a smaller envelope may be glued on the right face of the larger envelope. The interior may have a printed opaquing design and/or contain chipboard insert(s). It is designed for mailing correspondence/letters; records, or exposed and developed radiographic film. Excludes envelope, photographic negative; envelope, radiographic film mount, dental; and envelope, transparent.