A result without a specimen, method and test condition is not a usable packaging specification. We connect every reported value to the exact material stack, nominal thickness, laboratory conditions, date and project reference.
1. Verify the flexible material
| Check | Reference | What the result means | What it does not prove alone |
|---|---|---|---|
| OTR | ASTM D3985 | Steady-state oxygen transmission through the tested film or laminate under stated conditions. | The shelf life of every coffee in every finished pouch. |
| WVTR | ASTM F1249 | Water-vapor transmission through the tested flexible barrier under stated conditions. | Finished-pack protection if seals, valve or construction differ. |
| Seal strength | ASTM F88/F88M | Force required to separate a seal strip and the observed failure mode. | Leak-free performance without agreed sampling, sealing and acceptance criteria. |
ASTM itself notes that OTR is important but not the sole determinant of package protection. Buyer and supplier should agree on samples, conditions and acceptance criteria before treating a report as a release requirement.
2. Match the report to the bill of materials
Document check: a buyer receives an OTR report with a low value but cannot tell which laminate was tested. Ask for the specimen identity, layer order, nominal gauge, test method, temperature, humidity, units, date, and laboratory reference. Then match those details to the quoted construction. A report on a single film is not automatically evidence for a converted pouch; finished seals, valves, and handling need their own agreed checks. Before production, define who accepts each result and what sample count or threshold applies. This prevents a technically correct report from being used outside its scope and gives procurement a clear reason to request new evidence after a material or process change. If a revised material or converting step changes the specimen, ask whether the existing report still answers the project question.
The report name, layer order, grade or supplier reference, nominal thickness and tested date should match the approved production construction. If the barrier web, gauge, adhesive, sealant or converting route changes, the team reviews whether existing evidence still applies.
3. Verify the finished pouch
- Dimensions, gusset opening and filled stance
- Zipper operation, top-seal clearance and tear direction
- Valve model, position and installation
- Seal appearance and agreed seal-strength or leak checks
- Laminate bond, surface rub and handling condition
- Artwork, text, barcode, label area and finish registration
4. Keep a production trail
The release record should connect the signed artwork, physical reference, material specification, approved reports, purchase order, case quantity and inspection points. Repeat orders are checked against this controlled reference rather than against memory or a photograph.
Questions to ask when reviewing a barrier report
- Was a single film, laminate or finished pouch tested?
- What were the temperature and humidity conditions?
- What units and detection range were used?
- Does the layer order and thickness match the quotation?
- Are valve and seal performance covered separately?
- What acceptance criteria will control production?
Release packet
Before release, connect the exact specimen, test condition, material reference, filled-pack check, seal or leak observation, artwork version, acceptance criterion, and approval owner. If a layer, valve, seal process, or filling route changes, mark whether the evidence still applies.
Record the result with the project reference.
In practice
Make evidence easy to trace.
Every result should identify what was checked and under which conditions.
Define the question first
Write the decision that a test is intended to support: a dimensional fit, a sealing trial, an opening review or a performance requirement for the intended route. Identify the sample construction and the party responsible for the assessment. Ask for the relevant method, conditions and acceptance criteria before comparing results.
A report is more useful when its scope is clear. Avoid treating one attractive number or a generic certificate as evidence that every product in a supplier’s catalogue has the same performance.
Keep a usable receiving record
Agree which checks apply when the order arrives and how any difference will be recorded. Keep the approved sample, specification and artwork revision available to the person receiving the cartons. Record the affected quantity, lot or carton identity and photographs when raising an issue.
Preserve representative samples according to the agreed procedure rather than mixing everything into stock. This creates a clearer discussion with the supplier and helps distinguish a packaging difference from a change in coffee, filling conditions or handling.