Label adhesives explained, and why labels peel

A label that peels is rarely a bad label. Most of the time it is the right label on the wrong surface, put on at the wrong temperature, or tested too soon.

Trust me, the label itself is usually the last thing to blame.

At Jagannath Polymers we make pressure-sensitive tapes on our own tape plant in Jaipur. A self-adhesive label works on the same principle: a soft, sticky layer that flows into the surface under pressure, with no heat and no water. So the questions I ask about a label that will not stay on are the same ones we ask about tape.

My short answer is this. Choose the adhesive for the surface and the temperature, not for the label. Then press it on firmly and judge it after a day, not after a minute.

Let us go step by step, the way a course would. First the words, then the types of adhesive, then the four things that make labels fall off.

The words you will meet on a datasheet

Avery Dennison, one of the large label material makers, keeps a clear adhesives glossary. These are the terms that matter most, in plain words.

1. Initial tack is how hard the label grabs the moment it touches the surface.
2. Ultimate adhesion is the most holding power the label reaches, once the adhesive has flowed into the surface.
3. Dwell time is how long that takes. Avery Dennison puts it at 20 minutes to 24 hours.
4. Shear is how well the label resists sliding, for example on a vertical surface in heat.
5. Minimum application temperature is the coldest temperature at which the label should be put on.
6. Service temperature is the range the label can live in after it has been applied.
7. Mandrel hold is how well a label stays on a curved surface without its edges lifting.

We should also know how suppliers measure these. They use standard tests. In Europe the common set is the FINAT test methods, such as FTM 1 for peel adhesion, FTM 8 for shear and FTM 9 for loop tack. When you compare two labels, ask for figures by the same method, or you are comparing a kilo with a litre.

Types of label adhesive

Under these names sit two main chemistries. The Avery Dennison adhesive technologies guide (Europe, 2020) describes emulsion acrylic as a good choice for food contact. It describes hot-melt rubber as strong on the widest range of surfaces, best at low temperature, and good on rough or contaminated surfaces.

The same guide has one line every buyer should remember: "A removable adhesive at room temperature is actually permanent at low temperature!" So a removable label applied in a cold room may not come off clean at all.

I would print that line and stick it on the cold room door.

Reason 1: the surface does not want to be wet

Pour a few drops of water on a lotus leaf and they roll off as beads. Pour them on a clean steel thali and they spread out flat. The leaf has a low surface energy, and the steel a high one.

An adhesive behaves the same way.

On a high-energy surface it spreads and touches every point. On a low-energy surface it stays in tiny beads and touches very little.

A 3M white paper, Innovations in Bonding to Low Surface Energy Surfaces (2021), gives typical values in mN/m.

This is why a label that holds well on a PET bottle can lift off an HDPE drum or a PP crate. The fix is an adhesive made for low-energy plastics, or a surface treatment by the container maker. Moulded plastics can also carry release agents from the mould, which act like a thin layer of grease.

A cheap check helps here. Dyne test pens, sold by surface treatment suppliers, show roughly how "wettable" a plastic is. Ask your adhesive supplier which reading they need.

Reason 2: the temperature was wrong when the label went on

The Avery Dennison guide says most of its adhesives are designed for a minimum application temperature of +5°C. Once applied, its regular adhesives cope with -40°C to +80°C.

Notice the two numbers.

A standard label applied at room temperature and then frozen can be fine. The same label applied to a carton that has just come out of the cold room may fall off within hours.

Other makers publish other figures. Zebra's white paper Selecting the Right Label to Identify Your Finished Product (2023) gives -4°C as the minimum application temperature for its standard materials. So read the datasheet of the exact label you buy, not a general rule.

The second trap is water. A cold pack moved into a warm, humid room sweats. In the Indian monsoon this happens fast. The adhesive then sits on a film of water instead of the pack. My rule is to label before chilling where you can, or to use a cold-application adhesive and wipe the surface dry.

Reason 3: the shape or the surface fights the label

Curved surfaces are the classic case. A stiff label face on a small bottle tries to straighten itself, and the edges slowly lift. The Zebra white paper says small curved surfaces need a flexible material and an adhesive with good mandrel hold. In practice that often means a PP face instead of paper or PET, and sometimes a smaller label.

Oily and greasy surfaces are next. Oil sits between the adhesive and the pack, so the label sticks to the oil. Clean the spot first, or choose an adhesive meant for contaminated surfaces.

Textured and recycled surfaces come third. On rough board the adhesive touches only the high points. On a dusty carton it sticks to the dust. Here is a simple check I trust: peel the failed label and look at its back. If paper fibres are stuck to it, the adhesive held and the carton's top layer gave way. That is a carton problem, and a stronger adhesive will only tear more paper.

Reason 4: it was tested too soon, or pressed too lightly

Because adhesion builds over 20 minutes to 24 hours, a label peeled after one minute will always feel weak. A perfectly good label can be rejected this way.

I would never judge a label in its first hour.

Pressure matters just as much. The adhesive has to be pushed into the surface. A firm wipe with a cloth, a hand roller, or a properly set applicator makes a real difference over a light touch with one finger.

Find the cause from what you see

A test to run before you order

1. Ask for samples of the exact construction you will buy: face, adhesive and liner.
2. Apply them to the real surface, at the real temperature, by the real method.
3. Press each one firmly.
4. Peel one after 20 minutes and one after 24 hours. Note whether it comes off clean, tears, or pulls fibres.
5. Keep a few packs where they will live, such as the cold room, the sunny dispatch bay or the outdoor yard, and check them after 7 days.
6. Write down the surface, the temperatures, the times and the result. That note makes your next order easy.

I should also be honest about the limit.

No adhesive sticks to everything. Non-stick PTFE and silicone-coated surfaces defeat almost all of them, and wet surfaces defeat most. Sometimes the right answer is a different place on the pack, a sleeve, or a tag.

Labels are made by Jagannath Labels, our group's label company. If your labels keep peeling, send us a photo of a failed label (front and back) and the surface it came off, through the contact page. We will tell you what we would test first. If your problem is fading print rather than peeling, read our lesson on direct thermal and thermal transfer labels.