Cold labels fail for a reason that surprises most buyers: the problem is usually not the cold itself but the moment of application. Adhesive that is stiff when it first touches a chilled surface never wets it out, and the bond that never formed is the bond that lifts a week later in the freezer.
Two temperatures, not one
| Parameter | What it means |
|---|---|
| Minimum application temperature | The coldest surface the adhesive can still bond to at the moment of application |
| Service temperature | The coldest condition the finished bond can survive once formed |
Service temperature is almost always the lower of the two. A deep-freeze adhesive may hold at −40 °C indefinitely yet refuse to apply below 0 °C.
Method
| Item | Condition |
|---|---|
| Substrates | HDPE, PP, corrugated board, glass, or the customer’s own packaging |
| Application | Substrate pre-chilled to the stated application temperature; label applied cold, not warmed |
| Storage | 24 h to 7 days at +4 °C, −18 °C or −40 °C as specified |
| Wet-cold variant | Substrate condensation-wetted before application, for chilled and thawing conditions |
| Assessed | Edge lift, corner curl, peel after return to 23 °C, print and barcode legibility |
Typical cold-chain cases
- Chilled +4 °C — dairy, fresh meat, blood and plasma bags; condensation is the main enemy
- Frozen −18 °C — retail frozen food, ice cream, corrugated outer cases
- Deep freeze −40 °C and below — laboratory samples, specialist logistics
- Freeze–thaw cycling — the hardest case, because the bond is stressed repeatedly by moisture
Corrugated board deserves separate mention: it is porous, it is often applied to warm and stored cold, and its surface fibres tear before the adhesive does. We test it as its own case rather than assuming a plastic result transfers.
Related: Blood bag labels · PET labels · Label Laboratory