Printed Corrugated Boxes Sourcing is an independent sourcing partner. Follow-up uses the work email on the RFQ form; no public mailbox is published on this site.

Spec Review

custom size corrugated boxes

Resolve open specification choices for custom size corrugated boxes before an inquiry is sent. A substitute flute, wall count or print process needs a written check, not a photo match. This page reuses a specification split, not a sustainability story.

Inside dimensions in mm, flute profile, edge crush test or burst method, and die-line status still block a comparable quote when they are blank. Paperboard caliper language belongs on folding cartons; here the strength method is ECT or burst on corrugated board.

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Corrugated specification sheet with several size and flute fields still blank

Documents, not claims

This band is a document check. It is not a carbon, ESG or circular-economy statement. Certificates and recycled-content notes belong to a named lot. They do not become this site's badges.

What must be on the file

  • Board and flute confirmation for the production lot, not a brochure from another year.
  • Post-consumer recycled content, if requested, named as a percentage on that lot only.
  • Migration testing for ink when the liner will touch food.
  • Edge crush test or burst result on the method named in the brief.
  • Die line status before flexographic printing plates are treated as a sunk cost.

What to verify before accepting an alternative

  • A factory offers B-flute against a C-flute brief because the carton looks similar. Ask whether stack height, edge crush test and print surface still match.
  • A die-cut mailer is not a drop-in for a regular slotted carton even when both are custom size corrugated boxes.
  • A previous lot's food-contact letter does not travel if the liner or ink changes.
  • No discount percentage is published; price_comparisons is empty on the 2026-09-20 input set.

key_specs used on this page: box strength in ECT or burst, print process and color count, and order quantity in pieces or cartons. Film thickness in μm / mil applies only when a liner wrap is part of the same line. Capacity language here is inside millimetres, not bottle millilitres.

Digital print versus flexographic printing is a buyer trade-off, not a slogan. A catalog with many SKUs and weekly artwork swaps often keeps plate cost down on a digital press. A locked, high-volume shipper usually keeps unit cost and spot-color hold on flexographic printing. Write which side of that trade-off the RFQ is taking so two factories do not assume opposite processes. Mono-material recyclability language on corrugated usually means a kraft liner without a poly coating; a PE-coated inner is a different object.

Open fields on this worksheet are listed after you type below. The count is a reminder, not a validation of a factory reply.

Send specifications to compare factory quotes

If size, flute or document fields are still open, finish them in the requirement box. No published discount percentage without the same spec, quantity and delivery evidence.

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