made from white offset paper printed with colour on the interior or, alternatively, from brown natron paper (for grammatures, see info text) and grey board, th = ca. 0.5 mm, straight flap on the short side (peel and seal)
These are basic envelopes for frequent use sold at a good price even when only buying small amounts. The white ones have been printed with grey colour on the inside of the mailer with an eye to keeping the contents away from prying eyes. The brown version, of course, does not need this addition because you cannot see through them anyway.
The larger the mailer, the higher grammature of the paper used. In deciding on which grammatures would be best for the larger mailer we turned to the heavier values because, on the one hand, firmer paper provides greater stability while on the other because in the case of larger letters there is more margin vis-à-vis the postage requirement, meaning you do not have to worry about every gram like you do with standard letters.
Here are the respective grammatures:
C5 format: brown natron paper ca. 90 g/m² or, alternatively, white natron paper ca. 100 g/m²
B5 format: brown natron paper ca. 90 g/m²
C4 format: brown natron paper ca. 130 g/m² or alternatively, white natron paper ca. 120 g/m²
B4 format: brown natron paper ca. 130 g/m² or alternatively, white natron paper ca. 120 g/m²
Board back mailer, peel and seal
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