How to Freeze Packaging Specs Before Mass Production in China

Quick answer

Freeze packaging specs by locking drawings, material codes, artwork versions, approved samples, and written substitution rules before the mass-production PO. If any of those items remain “TBD,” factories will fill the gaps with assumptions.

Build a freeze package

Collect dielines or 3D, board/fiber/film grades, color standards, finishing recipes, packing methods, and the signed sample master. One missing item is enough to reopen debates during production.

Separate what is frozen from what is still open

List approved SKUs versus pending SKUs. Do not let an approved shipper authorize an unfinished retail insert. Gate each component independently.

Write anti-substitution language

State that board grade, flute, fiber blend, adhesive, film structure, or coating changes require written buyer approval and may require new samples. Verbal “same quality” substitutions are a common claim source.

Tie payment to evidence

Link deposit or balance gates to approved masters, golden samples, and pre-shipment inspection criteria. Ambiguous acceptance language invites disputes when cartons look “close enough.”

Control revisions after freeze

Use a revision log with date, owner, reason, and affected lots. Emergency changes should update the PO annex, not live only in chat threads.

RFQ / PO annex

Approved drawing and artwork revision IDs

Material codes; sample master IDs; photo set

Substitution ban list; re-approval triggers

Inspection AQL; retention sample rules; ship-hold contacts

Related PackTrades Knowledge

How to Plan Packaging Sample Rounds Before China PO, How to Request Packaging Samples from China Factories, How to Evaluate Custom Packaging Suppliers in China, Packaging Lead Times from China in Mid-2026.