A decoration is only durable against something specific, so a useful sample approval plan begins by listing what the bottle will actually meet after filling: divider contact, chilled storage, wet hands, capping, cleaning. Approve the sample against that list, record what was seen at each contact point, and tie the result to one artwork revision.
Describe the route to market before you ask for samples
Glass can carry paper or film labels, direct screen print, coatings, embossing, decals, or several of these together. They differ in surface preparation, curing, adhesion and appearance, and which one suits a project depends on bottle shape, artwork, run size, how the pack is presented and what happens to it once filled.
So the first document is a short description of the journey: refrigeration, divider packing, humid shipping lanes, hospitality handling, product residue. A preference inside the team is not a technical requirement until the responsible people have defined it and tested for it.
Mark where the bottle gets touched
Damage to decoration tends to show up in the same few places:
- where bottles rub against each other
- along divider edges and carton walls
- on conveyor guides during filling
- under the closure as it is applied
- wherever the consumer grips the pack
Moisture changes the picture. A label that holds well dry may behave differently under condensation, and a surface that resisted scuffing in a dry trial can mark once it is wet. Product reaching the neck or closure is a separate mechanism from abrasion on the body.
Draw these points onto a line drawing or a photo of the sample. Comments then refer to a location, a cause and an acceptance criterion instead of a general impression, and the designer can judge whether the right fix is moving the print out of a contact zone, adjusting the label, or changing the pack-out.
Record approval in one exposure matrix
Design, sourcing, filling and sign-off should work from a single sheet that names each check, says who observed it, and states whether the sample matches the configuration intended for production.
| Check | Record this | Question to settle |
|---|---|---|
| Dry handling | How print, coating and label look at the mapped contact points | Is the approved visual standard still met? |
| Condensation or wet handling | Any change in adhesion, scuffing or visible transfer | Does the planned sales channel involve this exposure at all? |
| Case and divider contact | Marks at the known pack-out contact locations | Does the protection suit this decoration? |
| Closure application | Interference, marking or overlap close to the finish | Can the components sit together without harming the design? |
| Artwork match | Revision, colour reference and placement | Does the sample carry the approved artwork version? |
Treat this sheet as a record of decisions. It does not replace a test protocol: any formal method, the number of samples and the pass/fail threshold are for the technical owner to set for the product and its market.
Give the sample and the artwork file one shared record
A frequent gap is that one team signs off the artwork, another signs off the look of the physical bottle, and nothing shows that the two approvals concern the same configuration. Assign the sample an identifier, keep the artwork revision with it, and photograph the main views in ordinary review lighting.
Where something deviates, note whether the exception is tolerated for the next sample round or must be corrected before production.
What the RFQ should say about decoration
Describe the decoration concept in the RFQ, and stop short of asking for a promise of performance nobody has defined. The useful inputs are the intended bottle, how the product is used, the closure concept, the route-to-market assumptions and what sample approval will involve. Design options are laid out on the custom glass bottles hub, and the RFQ checklist for glass bottles and jars is the form for passing those constraints on.
If a matte look is under consideration, the guide to choosing frosted glass bottles is a helpful reference. Whatever is chosen, material and decoration stay provisional until a sample confirmed by the plant has been reviewed.
FAQ
Is screen printing always more durable than a label?
No. No method wins in every situation. Suitability comes from the bottle geometry, the contact conditions, the artwork, the pack-out and the way the sample is approved.
Can decoration be signed off before the closure is available?
Early visual direction can be agreed without it if the schedule requires. Final confirmation needs the complete configuration, with the closure and any tamper-evident part fitted, because the finish is a high-risk contact area.
What should come back from a sample review?
Request the drawing or sample identifier, the artwork revision, a description of the decoration, the observations made, any exceptions, the responsible owner and the next action.