made of DuPont Tyvek, opaque, white, 54 g/m², straight flap on the short side, given dimensions: approx. overall dimensions (w x l)
Tyvek is a versatile material that is made up of many individual synthetic fibres (to be exact: polyethylene fibres). The non-directional fibres are heated and pressed together to form the material. The result is a lightweight but nonetheless nearly tearproof and waterproof fabric with a chequered glossy surface. It is thereby the perfect material to use for protecting items being mailed from here to there. Tyvek envelopes and mailers provide optimal protection against possible damages resulting from tearing or exposure to moisture or dirt. A further and often cost-saving feature of this material is its low weight because, of course, an envelope made of Tyvek is only about half as heavy as a standard paper or light paperboard alternative.
Please note regarding the version with the (film) window: The size of the window is 90 x 55 mm and it is located on the front side of the tall format exactly 57 mm from the top and 20 mm to the left.
Envelopes are usually available with three different types of seals. In order to avoid any confusion, here is a short explanation of the most used terms:
A gummed envelope has a strip of gum on the flap that is activated by moisture (licking).
A press seal envelope is closed by folding down a flap and pressing the two strips of glue together. No moisture is required.
Peel and seal envelopes are closed by removing the strip that covers the adhesive on the flap and pressing the flap into place.
What is the difference between envelopes on the one hand and mailers on the other? An envelope on which the flap is on the short side is called a mailer; if the straight or pointed flap is on the long side it is called an envelope.
The most common sizes of mailers are as follows: DIN C5 162 x 229 mm DIN B5 176 x 250 mm DIN C4 229 x 324 mm DIN B4 250 x 353 mm DIN E4 280 x 400 mm
Size and position of the DIN window: DIN C5, B5: The size of the window is 45 x 90 mm and its position when the mailer is horizontal is on the left (flap on the right) with a 60 mm margin from the bottom and 20 mm margin from the left side.
DIN C4: The size of the window in 55 x 90 mm and its position when the mailer is upright (flap at the top) is on the left side with a 212 mm margin from the bottom and a 20 mm margin from the left.
Because the post office is constantly changing the maximum size and limitation parameters, we refer you here to the hopefully always current Deutsche Post webpage: www.deutschepost.de. There you can also consult the German post office postage calculator (only in German although some info in English can be found on the Internet).
Similar webpages for other countries can be easily found in the Internet…
Bolsa Tyvek, cierre adhesivo con tira de silicona
C4, 229 x 324 mm, with window
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