Cumberland Laser Envelope Strip Seal Window Secretive Booklet Mailer C4 229 x 324mm Box of 250

C4 is 229 x 324mm under ISO 216 and it takes an A4 sheet, which is 210 x 297mm, flat and unfolded. That is the whole reason the size exists. It also takes A5 and A4 folded once with room to spare. If you are folding A4 in three you want a DL envelope instead, not this one.

A secretive envelope carries an opaque printed pattern on the inside of the paper so the contents cannot be read through the envelope when it is held up to light. It is the feature to look for when the enclosure carries names, account numbers, salary figures or medical detail.

Cumberland publishes a laser printer compatibility rating and a heat resistant glassine window against MPN 6123412 and against neither of the two heavier C4 window mailers, MPN 612344 and MPN 612347. Fuser heat is what damages an unrated envelope, usually at the window panel or the seal adhesive. If the address goes on the envelope, use this code.

The window on this code is a heat resistant glassine panel, which Cumberland's dealer record names as one of the reasons the envelope is rated for laser printing. Glassine is a paper based film rather than a plastic patch. Cumberland publishes no recyclability or compostability statement for the window, so we do not make one.

Cumberland's dealer record gives the window as 38 x 95mm positioned 69mm from the left edge and 25mm up from the bottom edge. It does not label which of the two figures is the width. The two heavy duty C4 window mailers in the same range are published with a taller window at the same position, so the codes are not window interchangeable. A sample is available on request before a machine inserted run is set up.

Yes. Cumberland publishes 90gsm for this code and 100gsm for MPN 612344 and MPN 612347. The lighter stock is what suits a printer path. For heavy or bulky enclosures the 100gsm codes are the sturdier choice, and neither of those is printer rated.

No forest certification code is published for this line. Cumberland is an ACCO Brands line and accobrands.com.au now redirects to a dealer portal with no anonymous route, so we could not read a first party environmental statement. One dealer listing describes the laser range as sourced from responsibly managed forests, but that is retailer copy with no certificate number behind it and we do not repeat it. We can request the certificate position from ACCO in writing.

The box is the selling unit. No supplier carton quantity is published for this code, so we do not state how many boxes travel in a carton. We can confirm it with the supplier on request.

Delivery time depends on your location, the size of your order, and the shipping option selected at checkout. For in-stock items, standard metro delivery in QLD, NSW and VIC is usually 1 to 7 business days. South Australia, Tasmania, Western Australia and the Northern Territory are generally 3 to 12 business days. Express delivery for eligible parcels under 3kg is usually 1 to 4 business days in QLD, NSW, ACT and VIC. Delivery estimates apply to in-stock items only and may vary due to carrier conditions or delays.

If you need to make a change to your order, please contact our team as soon as possible. Once an order has been processed or dispatched, changes may no longer be possible. You can contact us through our Contact Us page for assistance.

Mega Office Supplies ships orders Australia wide and occasionally internationally. The best avenue would be to contact us so we can customise a specific quote for you. Please note that associated international duties, taxes and levies will be the responsibility of the customer.

Mega Office Supplies accepts change-of-mind returns for unopened and unused products within 14 days from the invoice date, provided the item is returned in its original packaging and in resalable condition. Original shipping costs are not refundable, return shipping is the customer’s responsibility, and a restocking fee may apply depending on the product type and supplier. Some items, including electronics, assembled or installed furniture, food, beverages, medicines, custom-made products, and certain bulk or special-order items, are not eligible for return unless required under Australian Consumer Law.

If your order arrives faulty, damaged, or incorrect, please contact Mega Office Supplies as soon as possible. Where required under Australian Consumer Law, a repair, replacement, or refund will be offered. In these cases, Mega Office Supplies will cover reasonable return shipping costs, and photographic evidence may be requested to help process the claim. Items should be reported within a reasonable timeframe after delivery.