A label is not one material. It is three layers bonded into one article — a face stock, a pressure-sensitive adhesive and a release liner — and a compostability claim only holds if all three clear the same condition. In practice the liner is the layer that blocks it, and it is the layer most often left out of the conversation. This article takes the label apart, layer by layer, and sets out what has to be asked.
Three layers, one claim
Each layer is a different material family, chosen for a different job, and they are rarely chosen by the same supplier:
- Face stock — paper or film, chosen for printability, strength and the environment it survives.
- Adhesive — usually a pressure-sensitive acrylic or rubber system, chosen for tack and for what it sticks to.
- Release liner — the carrier the label is peeled from, usually a paper or film with a silicone release coat.
The claim attaches to the finished label, not to any one layer. A compostable face stock on a standard acrylic adhesive with a PET liner is not a compostable label.
Layer by layer: where each one stands
| Layer | Common materials | Compostability | Why it sticks | What can be checked |
|---|---|---|---|---|
| Face stock | Paper; PLA, cellulose or other bio-based films | Paper faces are the easy part; film faces vary by grade | Printability and strength usually decide the choice, not disposal | Whether a certified compostable grade exists for the face |
| Pressure-sensitive adhesive | Acrylic; hot-melt rubber; bio-based and compostable grades | Conventional acrylics are not compostable | Tack and ageing behaviour are hard to match with compostable systems | Whether a compostable adhesive grade is specified, and how it ages |
| Release liner | Glassine or kraft with silicone; PET film with silicone | Usually the blocker — the silicone coat and PET are not composting materials | Release performance is critical, and silicone is what delivers it | Whether an uncoated or alternative-release liner is available for the application |
| Printing ink | Water-based, solvent-based, UV | Depends on the system and the coverage | Ink is rarely chosen for disposal; coverage drives the load | The ink system and the printed area, particularly at full coverage |
The liner problem
The liner is the layer to raise first, because it is both the most likely blocker and the one a buyer has least control over. Glassine liners are paper and would compost if not for the silicone release coat; PET liners are a plastic film and will not compost at all. Silicone is what makes a liner release, and silicone is not a composting material.
Two practical consequences follow. First, the liner is frequently not part of the delivered article at all — it is removed at the point of application — so it may fall outside the scope of the customer's claim and inside the scope of their waste; clarify which is meant. Second, where the liner must be included, the direction is toward uncoated or alternative-release liners, and release performance has to be re-tested rather than assumed.
Dissolvable is not compostable
These are two different claims, tested against different things, and they are regularly conflated. A dissolvable or water-soluble label is designed to break down in water — the mechanism is dissolution, and it is a property of the material in a liquid. A compostable label is tested against a composting standard, in a managed biological process. Neither implies the other. A water-soluble label is not compostable by virtue of dissolving, and a compostable label does not dissolve in water.
Where a pack carries a dissolvable label — the dissolvable labels range is an example of the claim in use — that is a statement about the label in a wash or a water stream, not a statement about composting. Keeping the two apart matters, because a customer who reads one as the other will specify the wrong thing and discover it in an audit.
Common misuse
- Buying a compostable face and assuming the label follows. Adhesive and liner decide the outcome just as much.
- Reading dissolvable as compostable. Different mechanism, different standard, different disposal route.
- Forgetting the liner is removed before use. Whether it belongs in the claim depends on where the customer draws the boundary.
- Changing one layer without re-testing. Adhesive, liner and face interact; a swap in any one of them is a new construction.
FAQ
Are compostable labels available?
Some layers have certified compostable grades, and a fully compostable construction depends on all of them being specified together. The liner is usually the layer that decides whether the finished label can carry the claim at all.
What is the difference between a dissolvable and a compostable label?
A dissolvable label breaks down in water; a compostable label meets a composting standard in a managed process. They are tested differently and should not be used interchangeably in a specification.
Does the liner have to be compostable?
Only if it falls inside the boundary of the claim. Liners are usually removed and discarded at application, so confirm with the customer whether the liner is in scope before specifying it.
Can a standard acrylic adhesive be used?
It can, but it will not compost, and it will decide the outcome for the whole label. Where the claim matters, the adhesive has to be specified for it along with the face stock.
Browse the range
These limits apply across the whole label range — start at eco labels.