Where the overall total mail piece thickness does not exceed 2mm, the maximum largest insert movement is 30mm.
4.0 Mail Piece material properties Paperweight – grammes square meter (gsm) Envelopes: 70 gsm minimum Postcards: 200gsm minimum with a minimum thickness of 0.25mm Material Envelopes must be paper based. You cannot use polythene, plastic or transparent items, or aperture envelopes (i.e. window envelopes without a plastic film) Opacity The paper on which the address is printed on must be equal to or more than 85% opaque to prevent any character on the reverse side showing through Absorbency Absorbency value required 15-35gsm of water in one minute Using colour and logos As well as gaining a lower price benefit of adding a barcode Paper Colour Please do not use a red, green, black or dark coloured background, for the CBC as our machines cannot see Porosity Porosity value less than 700ml/minute
a barcode printed upon them. You must ensure a print contrast ratio of at least 40%, a reflective difference of at least 30% and a background reflectance of at least 35% for the barcode on CBC items. Design If you need to print a separate barcode (including a four state barcode) for your own use on the front of the envelope, you must contact your Account Manager for advice on format and positioning to ensure that this does not affect our ability to the read the Royal Mail barcode – CBC. Addressing The preferred address format is where each line of the address element is on a separate line. The postcode must be on the last line of the address. Please see Appendix A,‘Addressing Mailing Items’ for the ‘Elements of Address and Address Structure’. Please note that the requirement for ‘no other text/ information on the face of the mail item that could be construed as an address’ includes any areas of an insert which may appear in the window of the mail item arising from the insert movement. The country name (United Kingdom, Great Britain, England etc) must not be used. The postcode must be in capital letters and contain either one or two spaces between the two parts.
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