Synthetic, bio-based, plant-based: reading leather labels
Anyone who sources a leather alternative soon meets a pile of labels: synthetic, imitation, artificial, bio-based, plant-based, bioleather, bacterial cellulose. They sound precise, but each is looser than it looks. This note explains what each label usually tells you, the question it leaves open and how to turn the label into something you can verify. It is written for a brand team or R&D engineer deciding which sheet to test, and it is neutral about any one leather alternative.
Genuine leather, as the reference point
Leather is animal hide that has been tanned. It is the benchmark each leather alternative is measured against, for feel, strength and wear. Independent comparison studies summarised in trade sources we have read conclude that no alternative matches leather in every property, while some do better in particular ones. That is a useful reminder: judge a new sheet by the properties your product needs, not by whether it “replaces” leather in general.
Synthetic, imitation, artificial leather
These labels usually mean a fabric base coated with a polymer, most often polyurethane (PU) or polyvinyl chloride (PVC). In Indonesia, the everyday term for this family is kulit sintetis. The label tells you the construction (base plus coating). It does not tell you the base, the polymer, the thickness of the coating or which additives are inside. Ask for those.
Bio-based
“Bio-based” says that some of the material comes from biological sources instead of fossil ones. It does not say how much. A sheet can be a small share bio-based and a large share polymer. The question left open is the percentage and how it was measured. Ask for the figure, the method and whether it is for the whole sheet or only for one layer.
Plant-based
“Plant-based” says the main raw material comes from plants. Again, it does not describe the whole product. A plant-derived base can carry a polymer coating, a synthetic backing, a dye or a plasticiser. The question left open: what is every layer made of, and in what proportion?
Bacterial cellulose
Bacterial cellulose is a sheet grown by microbes in a liquid medium, then harvested, dried and finished. The raw sheet is a recognised material class and appears in many research papers. It is a description of how the base is formed, not of the finished product. Finishing steps, such as coating or softening, change the properties and the claims. The question left open: what happens after the sheet is grown?
Bioleather
“Bioleather” is a marketing word. It has no fixed technical definition, and different suppliers use it for different constructions. Do not treat the word as a specification. Ask what the material is made from, which layers it has and which tests exist.
Why claims attach to the finished product
An environmental claim or a claim about animal content is a statement about a product as sold. A good base does not make a good finished product if a coating or a plasticiser changes the picture. Rules on environmental claims are tightening: according to summaries we have read, EU rules on green claims apply from September 2026, and US regulators publish guidance that asks for substantiation. We are not lawyers, and you should take advice for your market. The practical lesson is the same everywhere: write down the full composition, keep the evidence and make the claim as narrow as the evidence allows.
A short method for any leather alternative label
- Write the label down.
- List every layer of the finished sheet.
- For each layer, name the material and the share.
- Ask for the test that supports each property you intend to mention.
- Keep the claim as small as the evidence.
Where Kora’s sheet stands
Kora lists a flexible sheet made from its coconut processing stream. The composition, including any coating, dye or plasticiser, is not published, no test data is published and the product status is not stated. So none of the labels above can be applied to it from the material on this site, and we do not apply any of them. If you want to know where that leaves your evaluation, read the sheet’s status page and send us your questions through the contact page. We reply within two business days.
Questions buyers ask
What does bio-based mean on a leather alternative label?
It says some of the material comes from biological rather than fossil sources, not how much. A sheet can be a small share bio-based and a large share polymer. Ask for the percentage, the method used to measure it, and whether it covers the whole sheet or only one layer.
Is bioleather a technical specification?
No. Bioleather is a marketing word with no fixed technical definition, and suppliers use it for different constructions. Do not treat it as a specification. Ask what the material is made from, which layers it has and which tests exist.
What does synthetic or imitation leather usually mean?
Usually a fabric base coated with a polymer, most often polyurethane (PU) or polyvinyl chloride (PVC). In Indonesia the everyday term is kulit sintetis. The label gives the construction, not the base, the polymer, the coating thickness or the additives, so ask for those.
Which of these labels applies to Kora's coconut-derived sheet?
None can be applied from what Kora publishes. Kora lists a flexible sheet from its coconut processing stream but has not published its composition, any test data or a product status, so this site does not apply any of the labels to it.