The label material decision is made once, usually early in a product or packaging development cycle, but it lives with the product for its entire commercial life. A label that lifts off a bottle after two weeks in a refrigerated display, ink that fades after six months of outdoor exposure, or an adhesive that leaves a sticky residue on reusable packaging – these are not random bad luck. They are the predictable result of a vague specification.
'Standard white label' is not a specification. It tells a supplier nothing about the surface the label will be applied to, the environment it will face, or the lifecycle it needs to survive. And yet this is how a significant proportion of label briefs arrive – and why field failures are more common than they should be.
This guide walks through the four key variables that drive label material selection – surface, environment, face material, and adhesive – and provides a practical framework for matching them to your application. Whether you are specifying a label for the first time or reviewing a specification that is already causing problems: start with the application, not the catalogue.
1. Start with the surface: what are you labelling?
The surface the label is applied to is the single most important variable in the specification, and the one most often overlooked. Two products can be used in identical environments and yet require completely different label materials, simply because one is packaged in glass and the other in HDPE. Surface energy is what decides it.
- High-energy surfaces – glass, stainless steel, aluminium – let adhesives spread easily and bond securely.
- Low-energy surfaces – polyethylene, polypropylene, PTFE, silicone-coated packaging – actively resist adhesion.
A standard permanent adhesive that performs flawlessly on glass can peel within days from a PE container, even using the exact same printed face material.
Surface texture matters too.
- Smooth surfaces give maximum contact between adhesive and substrate.
- Corrugated, ribbed, or textured surfaces reduce the contact area and demand an adhesive with high initial tack to bridge the micro-gaps.
- Rough or uneven substrates – some recycled cardboard, for example – may need a high-tack adhesive.
Surface contamination at the point of application is another common cause of premature failure. Oil residue from a filling line, condensation on a cold surface, release agents from earlier packaging steps – all of these can undermine adhesion even when the adhesive is technically the right match for the substrate.
Package geometry matters especially at small diameters. Small-diameter containers – vials, tubes, narrow bottles – put constant mechanical stress on a label as the face material tries to spring back to its flat state. Paper labels will lift at the edges on surfaces below roughly 30mm in diameter; lower-stiffness films or purpose-built wraparound label constructions are needed instead.
2. Account for the environment: what will the label endure after application?
A label that survives application and looks perfect on day one can still fail if it wasn't matched to the conditions it will face across the full product lifecycle. Mapping that complete environmental journey – from application, through storage, distribution, retail display, and end use – is the second critical step in material selection.
Temperature
Temperature is often the most demanding variable. Cold-chain applications – labels on frozen food, chilled beverages, cold-storage pharmaceuticals – need adhesives that hold their tack and strength below freezing.
Standard acrylic adhesives become brittle and lose grip below around 5°C. Freezer-grade adhesives are formulated to stay flexible and tacky down to −40°C. At the other end of the scale, labels on products going through sterilisation, powder coating, or high-temperature processing need heat-resistant adhesives and face materials that won't bubble, lift, or char.
Moisture and humidity
Paper labels absorb moisture and can wrinkle, tear, or delaminate in high-humidity environments. A film label solves the face-material side of the problem, but if the adhesive isn't rated for wet surfaces, the label will still lift. Both elements have to be selected together.
Chemical exposure
Labels on containers holding aggressive substances – solvents, acids, alkalis, fuels, lubricants, industrial cleaning agents – must withstand not just incidental splashes but, in many applications, prolonged contact with the product itself. Polyester (PET) and polyimide (PI) films with solvent-resistant topcoats are the standard starting point for chemical applications.
UV and weathering resistance
For labels used outdoors, service life comes down to UV resistance. Standard paper and film materials degrade under UV exposure: colours fade, films yellow, adhesives dry out.
For outdoor applications with an expected service life beyond 6–12 months, you need UV-stabilised films, UV-resistant inks, and acrylic adhesives designed for outdoor use.
For long-term outdoor labelling – external infrastructure, agricultural equipment, construction materials – polyester or polycarbonate films with protective laminates are the standard.
Rule of thumb: design for the worst condition your label will meet across its entire lifecycle – not the average condition, not the intended use case, but the most demanding scenario that could realistically happen. Specify to survive that.
If you want to see what happens when these variables are mismatched in practice – from the symptom side rather than the specification side – read our article '7 reasons why your self-adhesive labels are peeling off'.
3. Label face materials: paper, film, and specialty substrates
With a clear picture of the surface and the environment, choosing the face material becomes far more straightforward. The core decision is paper versus film – with several film variants covering different performance tiers.
Paper labels
Paper remains the most widely used label face material in the world, for good reason. It's cost-effective, takes a wide range of print techniques with excellent results, and is entirely suitable for dry indoor applications and short-lifecycle products. It's the right choice for ambient shelf goods, many quickly-consumed food and beverage products, and any application where cost is the priority and environmental conditions are mild.
The limitations are well known:
- absorbs moisture,
- tears easily,
- unsuitable for chemical or outdoor environments.
Polypropylene film (PP)
The workhorse of durable labelling. PP is moisture-resistant, tear-resistant, dimensionally stable, and available in multiple finishes – white, clear, silver metallised, and gold metallised.
PP film is the standard choice for labels on:
- food and beverages,
- household products,
- cosmetics,
- any application needing reasonable durability where extreme chemical or temperature resistance isn't required.
Clear PP on clear packaging creates the popular 'no-label look'.
Polyethylene film (PE)
The most flexible of the film face materials used in labelling. It comes in two main forms: LDPE (soft, highly stretchable) and HDPE (stiffer, more opaque). Thanks to its high flexibility, it conforms beautifully to squeezable, soft packaging and keeps its tack and flexibility at low temperatures – hence its popularity for labels on frozen and chilled products.
PE film works well for labelling:
- squeezable tubes and bottles (cosmetics, cleaning products, food in tubes),
- packaging that gets crushed or stretched during use,
- products stored or shipped at low temperatures,
- PE or PP packaging, where chemical compatibility between label and substrate matters.
Compared with PP and PET, it has lower dimensional stability and weaker chemical and heat resistance – not a fit for industrial or solvent-exposed applications. Its strength is conformability, not toughness.
Polyester film (PET)
A step up in performance. PET offers better chemical resistance, higher temperature tolerance, and greater dimensional stability than PP. It's the standard face material for:
- industrial labels,
- chemical container labels,
- electrical component labels,
- any application where the label must survive harsh conditions.
PET takes thermal transfer printing extremely well, which makes it a popular choice for variable-data labels in industrial and logistics settings.
Polyimide film (PI)
The material of last resort for extreme conditions: labels on PCBs going through reflow soldering, autoclave-sterilised labels on medical equipment, aerospace applications where temperatures can hit 300°C and beyond. Polyimide is expensive and needs specialist printing processes, but it performs where no other label material can.
Vinyl film and specialty substrates
Vinyl offers flexibility and conformability – it bends, stretches, and follows irregular shapes that would cause rigid films to wrinkle or lift. It's widely used for outdoor promotional labels, cable and wire marking, and curved or irregular surfaces.
Specialty substrates answer specific functional needs: destructible vinyl labels designed to fragment on removal (tamper evidence), void labels that leave a visible pattern once peeled, and textile labels built to survive repeated washing. Each is a dedicated solution to a specific problem.
4. Label adhesives: the hidden half of the specification
If the face material is the visible part of a label specification, the adhesive is the structural part – and it's responsible for a disproportionate share of field failures. The face material gets the attention. The adhesive does the work.
Permanent adhesives
The default choice for most applications. Once applied to the correct surface, they're meant to stay in place for the product's entire useful life. There's meaningful variation within this category: initial tack, ultimate bond strength (once fully cured, usually after 24–72 hours), and temperature range. Not all permanent adhesives are equal – specifying a standard permanent adhesive for a demanding application is a common cause of failure.
Removable and repositionable adhesives
Removable adhesives are formulated for clean removal without leaving residue on the substrate. They suit short-term product labelling, retail price tags, labels on reusable packaging, and any application where the label is meant to come off at end of life. The trade-off is lower bond strength.
Repositionable adhesives have very low initial tack, so a label can be lifted and reapplied several times before the adhesive loses its grip. Used where precise placement is critical and mistakes need to be correctable.
Specialty adhesives: freezer-grade, high-tack, and heat-resistant
Freezer-grade adhesives keep their tack at application temperature (which may itself be low, if labels are applied in a chilled environment) and through storage and distribution below freezing. A standard permanent adhesive on a frozen product will typically lift within days.
High-tack adhesives are built for difficult surfaces:
- low-energy plastics,
- rough or textured substrates,
- recycled cardboard,
- lightly contaminated surfaces.
They deliver significantly higher initial tack and ultimate bond strength than standard permanent adhesives.
Heat-resistant adhesives are needed when labels are applied before or during a high-temperature process:
- powder-coating labels,
- labels on products going through a sterilisation cycle,
- labels on products baked or cured after assembly.
The mismatch trap: it's entirely possible to specify a high-performance face material – polyester film, for example – and pair it with a standard permanent adhesive that fails in the intended environment. Face material and adhesive have to be evaluated as a system, not independently. Always test labels on your specific substrate under your specific conditions.
5. Liner and label format
The liner – the silicone paper or film the label sits on before application – is often treated as irrelevant to performance. In practice, it affects everything from die-cutting quality to application speed to sustainability profile.
Standard glassine liners work well for most manual, semi-automatic, or automated applications. PE-coated paper liners give better moisture resistance in high-humidity environments. PET film liners offer the highest dimensional stability and are preferred for high-speed applications where precise label registration is critical.
Linerless labels – using a release coating applied directly to the face material, eliminating the liner altogether – are becoming increasingly relevant for high-volume applications. They cut material waste, fit more labels per roll, and remove the need to dispose of a liner at all. The trade-off is that they require dedicated application equipment.
6. Printability: matching material to your printing process
Face material specification and print process specification have to be developed together. A face material that performs perfectly in the application environment but is incompatible with the printing process isn't a solution.
Thermal transfer (TT) printing
The most widely used process for variable-data labels – batch codes, best-before dates, serial numbers, barcodes. It uses a heat-activated ribbon to transfer ink onto the label surface, producing a durable, high-resolution print. The face material needs a topcoat matched to the ribbon type (wax, wax-resin, or resin).
Direct thermal (DT) printing
Uses a heat-sensitive coating on the face material itself, eliminating the ribbon. It's cheaper and simpler to run, but produces prints that fade under UV, high heat, or chemical contact. Suitable for short-life labels – shipping labels, receipts, food date labels – and shouldn't be used for labels expected to stay legible longer than 6–12 months.
Digital, flexographic, and offset printing
Digital printing (inkjet or laser) enables full-colour, short-run printing with high resolution and no plate costs. It's the standard for small-to-medium-run branded labels, promotional labels, and applications needing variable data. Flexographic and offset printing are used for high-volume production of pre-printed, full-colour branded labels ordered in medium-to-large quantities. Face material choice must be confirmed with the printer before print-ready artwork is finalised.
7. A practical framework for choosing self-adhesive label material
A consistent, repeatable label specification process comes down to six steps:
- Define the surface: substrate material, surface energy, texture, geometry, and any contamination factors.
- Map the use environment: temperature range (including worst-case extremes), humidity, chemical exposure, UV and outdoor exposure, mechanical stress.
- Choose the face material: paper for dry indoor use; PP and PE film for general durable applications; PET for chemical and industrial environments; polyimide for extreme temperatures; vinyl for flexibility and conformability.
- Choose the adhesive: permanent, removable, freezer-grade, high-tack, or heat-resistant – matched to surface energy and environmental conditions.
- Confirm the liner and format: liner type matched to environmental conditions and application speed; format matched to the application method.
- Align with the print process: confirm face material compatibility with the print technology and verify expected print durability under the application's conditions.
Warning signs it's time to respecify
- Labels lift or curl at the edges within the product's expected lifecycle.
- Print fades or smears under normal handling.
- Adhesive leaves residue on the substrate after removal (when a removable adhesive was specified).
- Labels bubble or wrinkle after application.
For complex applications – labels on low-energy plastics, chemical container labels, labels going through sterilisation or high-temperature processes – your label supplier should be involved in the specification process from the start, not brought in after a field failure. A good supplier will ask the right questions, provide qualification data for the material combination under consideration, and flag risks before they become problems.
The right label material for the right application
There's no single best label material. There's only the right material for your specific surface, environment, print process, and application lifecycle. A specification that answers those questions precisely – before a label is printed or applied – costs less, performs better, and causes fewer problems than one built on defaults and assumptions.
If your current label specification is causing problems, or if you're starting from scratch and want to get it right the first time, the Comex team is here to help. We work with customers across industries to develop label specifications built to last across the full lifecycle of the label, not just at the point of purchase.
Talk to our specialists about your application to find the right starting point for your specification.
FAQ – frequently asked questions
What's the difference between PP and PET label film?
PP is a lower-cost film that's durable enough for most consumer applications – food, cosmetics, household chemicals. PET offers higher chemical and temperature resistance and better dimensional stability, and is the choice when a label needs to survive an aggressive industrial or chemical environment.
What label material should I use for frozen products?
PE film performs well thanks to its flexibility and ability to keep its tack at low temperatures, but the material is only half the equation – you also need a freezer-grade adhesive designed for application and use below 0°C. A standard permanent adhesive on any film face material will still peel off in cold-chain conditions.
Is paper label material suitable for outdoor use?
Not in its standard form. Paper absorbs moisture, wrinkles, and has no UV resistance. For outdoor applications lasting more than a few months, you need a UV-stabilised film – typically PP or PET, depending on the other environmental demands.
How do I choose a label material for plastic packaging (PE or PP)?
The face material alone isn't enough – the adhesive is what really matters. PE and PP packaging has low surface energy, so a standard permanent adhesive may not bond reliably no matter which label film you choose. You need a low-surface-energy or high-tack adhesive matched specifically to that substrate.
Does label material or adhesive matter more for durability?
Both have to be evaluated together, not separately. Even a well-chosen face material – polyester film, for example – will fail if it's paired with a standard permanent adhesive in an environment that adhesive wasn't designed for. Face material and adhesive form one system, not two independent decisions.
Which label material holds up best to chemical exposure?
Polyester (PET) and polyimide (PI) films with solvent-resistant topcoats are the standard starting point. PI is reserved for extreme conditions (soldering, autoclave sterilisation); PET is sufficient for most industrial and chemical applications.
