Their aspect ratio ranges between 1:1.3 and 1:1.5, making them very similar shape to the announcement envelopes. They are most commonly used for catalogs, brochures, and are made with a center seam to make them more durable. The most popular announcement envelopes are Lady Grey (A2) and Diplomat (A9). For standard US envelope sizes Lady Grey (A2), Thompsons Standard (A6), Besselheim (A7), Carrs (A8), Diplomat (A9), Willow (A10), 6, 6, 7, 7, 8 5/8, 9, 10. Their aspect ratio ranges between 1:1.3 to 1:1.6, which makes them more of a square shape, rather than long and thin like the Commercial envelopes. The most well known commercial envelope is No.10, as it is able to fit Letter size paper folded three times, or Legal size paper folded four times parallel to the shorter side.Īlso known as A series envelopes, most commonly used for greeting cards, invitations and photographs. They are long and thin, with an aspect ratio of between 1:1.6 and 1:2.2. This product range includes the popular 10 envelope which measures 4 1/8 by 9 1/2. For example, A2 becomes A-2.Īlso referred to as Office envelopes, are most commonly used in business situations as they are suitable for automated franking and filling. Regular Envelopes are the standard of business envelopes. To identify the difference between a ISO size and the US size, a hyphen is often inserted between the letter and number. Other less known styles of envelope are Baronial, Booklet and Square. They are known as Commercial, Announcement and Catalog. There are three main types of envelopes used in the US and they do not correspond to the ISO standard of paper sizes.
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