An overview of the ISO 216 envelope size format standard, including definition of C series envelope sizes (C3, C4, C5 etc). The purpose of this site is to explain current international standard envelope sizes, covered by the ISO 216 Standard and to provide size charts to allow a quick lookup of sizes.
Type of Website: Information Site
Size of Website: 1-5 pages
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Author Submitted Keywords: international, envelope, envelopes, size, sizes, types, windows, seals, formats, standards, C3, C4, C5, DL