Domestic Bulk Mail Envelope Layout Standards - New Zealand Post

1.3 Mail piece construction and materialsMail piece dimensionsMail pieces must be rectangular with an aspect ratio 1 of1.4–2.6. To ensure your mail piece can be machine sorted,its dimensions must be:MinimumMaximumHeight 88mm 165mmLength 138mm 240mmThickness 0.15mm 6mmWeightDL 55gC5 75gMail piece construction and envelope weightThe minimum paper weight for machine sorted envelopesis 70gsm.PostcardsTo machine sort postcards effectively, they must have apaper weight of at least 230gsm. We recommend using230gsm to minimise the potential for damage. The sideof the postcard which contains the delivery address andPermitPost impression or FreePost indicia must complywith all the machine sorted envelope layout specificationsset out in these standards.1To determine the aspect ratio, divide the envelope length by its height.Self mailersFolded self mailers (i.e. mail pieces made from a foldedsingle sheet of paper) and other similarly built mail piecesmust be fully sealed with gum, tape or glue all the wayaround the mail piece. Clasps, buttons, string, staples,glue dots and similar devices are not compatible withthe machines and cannot be used. The paper weight forself mailers needs to be at least 70gsm.Paper type and sealing methodsThe paper used for the envelope (and the insert if usingwindow envelopes) must be opaque or dense enough toprevent any printing or graphics from the inside of themail piece clearly showing through.Envelope paper for machine sorted mail items must:• be constructed of paper only and not be synthetic• not be phosphorescent• be suitable for ink to dry in less than a second• have a matt finishKraft envelopes and recycled paper (bleached or nonbleached) are acceptable paper types for machinable mailproducts. If overprinting in a colour other than black,variation in the final tone can occur, especially on nonbleached paper stock. Please e-mail us your envelopedesign for assessment before printing, even if using anapproved pantone colour on fp.pp@nzpost.co.nz.Got a question or need to approve your envelope design? Please contact us via fp.pp@nzpost.co.nz or on 0800 501 501Incompatible paper types for machine sorted itemsinclude:• Decorative paper containing dark fibres, backgroundpatterns or textures• polywrap• shrinkwrap• spunbonded olefin (sheet product madeof high-density polyethylene fibres)• silver foil• flow wrap• any material containing metalMail pieces must not be sealed using clasps, buttons,string, staples, glue dots or similar devices.If using any of the above, please refer to our manuallysorted products – see section 2.0.InsertsMail pieces must not contain magnetic items or itemscausing an uneven thickness, such as pens, pencils andloose keys or coins. This includes product samples as theycause uneven surfaces and pose a risk to the machineand the mail piece itself should any breakages occur.15