A self-adhesive label is one of those elements of a production or warehousing process that rarely features in lengthy meetings – until it starts causing problems. A label that peels off is not merely an aesthetic inconvenience. In a B2B environment, this means real losses: unidentified pallets in the warehouse, tracking errors in production batches, complaints from recipients, and, in regulated industries, even legal consequences. That is why it is worth understanding, once and for all, why labels lose their adhesion and how to prevent it effectively.
How does a self-adhesive label work? A short lesson in adhesive physics
To understand why a label peels off, you first need to know how it sticks in the first place. A self-adhesive label is most commonly a three-layer system: the label material (for example, paper or film), the adhesive layer, and a silicone substrate (liner) that serves as the carrier for the label and protects the adhesive from premature contact with the labelled surface.
The adhesive used in labels is most commonly acrylic or rubber-based, relying on adhesion and cohesion.
- Adhesion is the attractive force between the adhesive and the surface to which it is applied.
- Cohesion is the internal consistency of the adhesive itself – its resistance to tearing.
A label that peels off completely (together with the adhesive) has an adhesion problem. A label that 'slides off', leaving a layer of adhesive on the surface, has insufficient cohesion.
The balance between these two forces, as well as the properties of the surface, temperature, and application time, are the factors that determine whether a label stays in place for one day or for several years.
7 main causes of self-adhesive label peeling
1. Incorrect adhesive for the intended application
This is the most common and, at the same time, the most underestimated mistake. There is no single universal label adhesive – different applications require different adhesive formulas.
Acrylic adhesives are characterised by very good resistance to high temperatures, UV radiation, and moisture. They perform excellently on outdoor labels, chemical products, or packaging that ends up in environments with variable conditions. Their drawback is slightly weaker immediate tack – they need a few moments or even a few hours to reach full adhesive strength.
Rubber-based adhesives have the opposite properties: very strong immediate tack, but limited resistance to temperature and UV. They work well indoors, for short-term applications, or wherever an immediate label 'grip' is important. They also perform well during application at low temperatures.
Hot-melt adhesives are the speciality of industrial applications – they are applied at high temperature and solidify to form a very strong bond. They are frequently used in logistics for cold labelling.
Choosing the wrong adhesive for the working environment is a straightforward path to problems. A label with a rubber-based adhesive that ends up in a cold store or outdoors will peel off almost immediately.
2. Incompatible substrate – the problem of surface energy
This is a concept that often surprises manufacturers encountering it for the first time, yet it is absolutely crucial. The surface energy of the material onto which the label is applied determines whether the adhesive will be able to 'grip' it.
High-surface-energy materials – such as glass, steel, wood, paper, and cardboard – bond readily with adhesives. Labels applied to glass jars or cardboard boxes rarely cause problems in this respect.
Low-surface-energy materials – such as polyethylene (PE), polypropylene (PP), PTFE (Teflon), or lacquered and waxed surfaces – are naturally repellent to most adhesives. If your production line labels polypropylene containers or polyethylene bags, a standard acrylic adhesive may simply not provide sufficient adhesion. In such cases, special low-surface-energy adhesives or substrate pre-treatment (eg corona treatment) are required.
In logistics, this problem arises frequently when labelling stretch film or plastic packaging. Warehouse workers repeatedly report that labels 'peel off by themselves' – and they are right, because these are not faulty labels, but labels matched to the wrong substrate.
3. Temperature – enemy number one of adhesion
Temperature affects label adhesives in two ways: it influences both the moment of application and the conditions of storage or transport.
Application temperature is one of the most frequently overlooked factors. Most standard acrylic adhesives require both the label and the substrate to be at least +10°C at the moment of application. Below this threshold, the adhesive loses plasticity and is unable to properly 'flow' into the microscopic irregularities of the surface, which dramatically reduces adhesion. The result? The label appears to be stuck, but at the first opportunity – a vibration during transport, a temperature change, a gentle scrape – it falls off.
In practice, this problem is widespread in refrigerated and frozen logistics. Labels applied to products coming out of cold stores or directly into a freezer must be made with adhesives designed for low application temperatures, even below 0°C.
Service temperature is the range of temperatures within which the label must remain adhered throughout the entire product life cycle. A product that moves from a room-temperature warehouse to a freezer (-25°C), then is transported at an outdoor temperature, and arrives in a shop, passes through an extreme range of thermal conditions. Only a label specifically selected for such applications will withstand this cycle without peeling.
4. Moisture and chemical environment
Moisture is another serious enemy of labels, particularly paper ones. Paper that absorbs water loses its rigidity, and the adhesive may 'wash out' or lose its adhesive properties under the influence of moisture. In high-humidity environments – the food industry, laundries, fish processing plants, hot-wash facilities – paper labels are practically useless.
The chemical environment is a particularly significant topic for manufacturers of industrial chemicals, cleaning agents, or fertilisers. Fumes from aggressive substances, direct contact with aqueous solutions, or oils, can attack both the adhesive layer and the label material itself. In such applications, film labels (PE, PP, PET, or PVC) with chemically resistant adhesives are essential.
5. Contaminated or undegreased surface
Adhesive bonds with the substrate at a molecular level. If there is a layer of oil, dust, remnants of a previous label, or a release agent between the adhesive and the substrate, there is physically no possibility for the label to adhere permanently. It is rather like trying to stick tape to wet glass – the adhesive force is a fraction of what is achievable.
In industrial practice, this problem occurs when labelling packaging after washing (if traces of detergent or antibacterial agent have not been rinsed off), when labelling metal containers (traces of grease or anti-corrosion agent), and also wherever workers touch surfaces with bare hands – fingerprints are a thin layer of fat that effectively weakens adhesion.
6. Excessively long storage time or poor storage conditions
Self-adhesive labels have a limited shelf life, which manufacturers typically specify as 1–2 years from the date of production when stored under standard conditions (18–25°C, relative humidity 40–65%). Outside this range, the adhesive gradually loses its adhesive properties – it ages, hardens, or undergoes chemical degradation.
Storing labels near radiators, in damp basements, or in direct sunlight is a straightforward path to problems. It is always worth checking the production date of labels upon receipt from the printer and applying the FIFO principle (first in, first out) when taking labels from storage.
7. Errors in the application process
Even the best label matched to an ideal substrate can peel off if it has been applied incorrectly. The most common application errors include:
- insufficient pressure during application (the adhesive had no chance to make proper contact with the substrate);
- applying to curved or uneven surfaces without the appropriate label material (rigid paper will not conform to a bottle as well as flexible film); and
- too short a time after application before exposing the label to difficult conditions.
How to choose self-adhesive labels to avoid problems
Now that we understand the mechanisms behind peeling, we can approach the topic of label selection in a systematic way. Here are a few key questions worth asking before placing a label order.
What is the substrate? This is question number one. If you are labelling glass or cardboard – you have a wide variety of choices. If you are labelling plastics, particularly PE or PP – you need labels with low-surface-energy adhesives.
What is the temperature range throughout the entire product life cycle? Think about the whole journey of the product: production, warehouse, transport, sale, and use. If at any point along that journey the product will be exposed to an extreme temperature – your labels must account for this.
What humidity conditions will the product be stored in? Food, pharmaceutical, and chemical manufacturers should almost always opt for film rather than paper.
How long should the label remain adhered? A label on a pallet in a warehouse may be seasonal. A label on an industrial device must last for years. These applications require entirely different adhesives and materials.
Will the label be exposed to friction, abrasion, or contact with chemicals? If so – you need a film label with an appropriate laminate, or without one, but with an adhesive and material matched to the aggressive environment.
Answers to these questions will enable any good label printer to propose a precise solution, rather than a standard 'fits everything' product that, in practice, fits nothing in particular.
Label materials and resistance to demanding conditions
The choice of label face material is a decision at least as important as the choice of adhesive. In short: paper is cheap and works well under standard conditions; film is more expensive, but performs where paper fails.
Standard paper (coated or uncoated) is the choice for indoor, dry, and short-term applications. It absorbs ink and printing dye very well, so print quality is usually excellent. It does not perform well in moisture, when in contact with fats, or at high temperatures.
Thermal paper is used in thermally printed labels – on warehouse, point-of-sale, or logistics printers. Its drawback is sensitivity to heat (the print may fade) and UV.
Polyethylene film (PE) is flexible and moisture-resistant, but has limited chemical and thermal resistance. It performs well on soft, deformable containers.
Polypropylene film (PP) – both oriented (OPP/BOPP) and cast – is a very popular choice in the food and cosmetics industries. It is resistant to moisture, fats, and abrasion, and at the same time delivers excellent print quality.
Polyester film (PET) is the premium option among label films. It withstands high temperatures (even above 150°C), is resistant to most chemicals, and is mechanically very durable. Used in industry, electronics, and wherever a label must survive exceptionally harsh conditions.
PVC film is characterised by good resistance to atmospheric conditions, chemical corrosion, oil, and damage; accordingly, PVC is a widely used material for producing long-lasting labels.
Subtle but important: the printer's role in label quality
Even the best-matched material and adhesive can fail if the label itself has been poorly manufactured. In a professional self-adhesive label printer, the quality of the adhesive, the evenness of its application, the precision of die-cutting, and the correct selection of the silicone substrate are all elements subject to strict quality control.
It is therefore worth not treating labels as a purely price-driven commodity, and instead choosing a supplier who can discuss the application with you, rather than simply asking for the print run and format. A good printer will ask you about the substrate, the working environment, and the durability requirements before moving on to pricing. If they do not ask these questions – that is a warning sign.
If you are looking for a partner who will approach your order comprehensively, and help you select the optimally matched label in every respect – we invite you to get in touch.
We advise at the design and material selection stage, and carry out orders for clients in the manufacturing, logistics, and food industries.
FAQ – frequently asked questions
Why do labels peel off in cold stores?
Standard acrylic adhesives have a minimum application temperature of approximately +10°C and limited resistance to cold during use. For refrigerated and frozen applications, special low-temperature adhesives are required, which retain their plasticity and adhesion even below -25°C.
Do labels on plastic always peel off?
No – but they require specialist adhesives suited to the low surface energy of plastics. Standard adhesives may not be sufficient on PE or PP. It is worth consulting a printer before placing an order.
How long do self-adhesive labels retain their adhesion?
This depends on the adhesive, the material, and the service conditions. Indoor labels under standard conditions may remain adhered for years. In difficult conditions (high humidity, extreme temperatures, contact with chemicals), durability shortens dramatically – which is why proper product selection is so important.
Can a peeled-off label be reapplied?
Usually not, or at most only temporarily. After peeling off, the adhesive loses some of its adhesive properties – having been touched, covered with dust, or stretched, it loses bonding strength. It is better to replace the label with a new one.
Does temperature during printing affect label adhesion?
Yes, in the case of labels printed via thermal print heads. Excessively high head temperature can locally damage the adhesive layer. Printers should be calibrated in accordance with the label manufacturer's recommendations.
How should labels be stored to prevent loss of adhesion?
In a dry place, at a temperature of 18–25°C, away from direct sunlight and heat sources. Labels should not be stored horizontally in excessively high stacks – excessive pressure can cause permanent deformation of the roll and deformation of the adhesive layer.
Which labels should I choose for the food industry?
In the food industry, resistance to moisture and fats is essential, as is compliance with food-contact requirements (eg FDA standards or European regulations). PP or PE film labels with acrylic adhesives or special food-grade adhesives are most commonly used.
Summary
A self-adhesive label that peels off is almost always the result of a mismatch – the wrong adhesive for the substrate, the wrong application temperature, the wrong material for the working environment. That is precisely why a conversation with an experienced printer before placing an order is so important – it makes it possible to avoid costly problems before the labels even reach the production line.
If you have any doubts about the correct label selection for your application, we will be happy to help – contact us, describe your working environment and substrate, and we will propose a solution tailored to your needs.
