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Spec Review

brown kraft paper bags

Resolve open specification choices for brown kraft paper bags before an inquiry is sent. A substitute ply, valve or moisture construction needs a written check, not a photo match. This page reuses a specification split, not a sustainability story.

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Brown kraft paper valve bag specification sheet with several 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

  • Paper grade sheet 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 bag will touch food powder.
  • Water vapor transmission rate or moisture-ply note when a PE inner ply is priced.
  • Die line status before flexographic printing plates are treated as a sunk cost.

What to verify before accepting an alternative

  • A factory offers three-ply uncoated kraft against a four-ply PE-lined brief because the bag looks similar. Ask whether fill mass, burst strength at the valve and outdoor storage still match.
  • A sewn open-mouth sack is not a drop-in for a pasted valve bag even when both are brown kraft paper bags.
  • A previous lot's food-contact letter does not travel if the ink or PE ply changes.
  • No discount percentage is published; price_comparisons is empty on the 2026-09-20 input set.

key_specs used on this page: film or ply thickness in μm / mil when a PE ply is named, print process and color count, and order quantity in pieces or cartons. Box ECT applies only when a shipper is part of the same line. Capacity language here is fill mass in kg or lb, not bottle millilitres.

Mono-material recyclability versus moisture performance is a buyer trade-off, not a slogan. Uncoated kraft can simplify recycling reporting. A PE inner ply can be required for cement or dry mortar that sits in humid storage. Write which side of that trade-off the RFQ is taking so two factories do not assume opposite stacks.

Send specifications to compare factory quotes

If valve, ply 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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