Decide the test before you approve the label artwork
If you are signing off on a care label or woven label for a light-coloured garment, the question is not whether the adhesive is strong enough. It is whether the adhesive will stay where you put it. A label adhesive migration test answers that question before bulk production, and it is far cheaper to run at sample stage than to discover at retail that a white neck label has picked up a grey halo.
Migration is the movement of adhesive components — plasticiser, tackifier, residual solvent — out of the adhesive layer into the label face, the fabric, or both. Bleeding is the related problem of dye or ink moving within the label itself. Both are accelerated by heat, humidity and time, which is why a label that looks clean on day one can fail after a sea freight container sits in the sun.
What a label adhesive migration test actually checks
A migration test is not one test. Depending on the label construction, a lab will typically look at four things:
- Staining of the label face. The adhesive is pressed against the face material under heat and load, then the face is inspected for discolouration or a visible halo.
- Staining of the garment fabric. A labelled swatch is aged and the fabric under and around the label is checked against an unlabelled control.
- Colour bleed from the label. Printed or dyed labels are checked for ink or dye transfer onto an adjacent white cotton swatch.
- Adhesive residue and tack after ageing. Relevant for heat transfer labels and pressure-sensitive stickers, where the bond must survive washing and drying without turning gummy.
For pressure-sensitive and heat-seal adhesives, the ageing step is the part that matters most. Common protocols use elevated temperature (for example 40°C or 50°C for a set number of hours) or a heat-age cycle that simulates a few weeks of warehouse and transit conditions. Ask the lab which ageing regime they used — a pass at room temperature for 24 hours tells you very little.
Choosing the construction that resists migration
Most migration failures come from a mismatch between adhesive chemistry and face material, not from a bad batch. The table below compares common options on the criteria that drive migration risk.
| Label type | Typical adhesive | Migration risk | Best used on | Watch out for |
|---|---|---|---|---|
| Woven label, end-folded | Hot-melt or water-based | Low to medium | Cotton, polycotton |
