The Definition — what “clean” means here, precisely
“Clean” without a definition is just another green word. This page is the definition we apply to our own material. Five criteria. Each one testable. Each one documentable. Each one phrased so you can paste it into a brief — for us or for anyone.
01 — Tanned with clean chemistry
What it means: No tanning agents — main tanning or retanning — classified as acutely toxic, as skin or respiratory sensitisers, or as CMR under EU hazard classification (CLP). The supplier can name, in one sentence, what tans the leather.
Why it matters: This is the one question almost nobody answers. “Chrome-free” says what is absent, not what is present — and some chrome-free alternatives carry harsher classifications than what they replace. Auxiliaries such as fatliquors, dyes and finishing chemistry are covered by criteria 2 to 4, measured on the finished article.
How to verify: A written declaration naming the tanning system and its CLP classification. Not an opinion — every classification is an official EU entry anyone can look up.
02 — Free of bisphenols
What it means: BPA, BPS and BPF below the limit of quantification — measured on the finished leather, not just on the inputs.
Why it matters: The substance family you know from the baby-bottle debates enters leather through syntans and retanning agents. EU restrictions keep tightening. Residues also drive the yellowing of white leathers.
How to verify: A current report from an accredited third-party laboratory on the finished leather, stating the analytical method and its limit of quantification — otherwise “not detected” is not comparable between labs.
03 — Safe on your skin
What it means: The article is dermatologically tested by an independent institute for permanent skin contact.
Why it matters: Steering wheels, straps, watch bands, gloves — leather lives on skin. “Skin-friendly” is a marketing word; a dermatological test is a result.
How to verify: A certificate from an independent dermatological institute, with its scope and date. The scope matters: a certificate for a tanning agent is not a certificate for the finished leather.
04 — Clean air around it
What it means: VOC, fogging and odour values passing recognised automotive interior norms — European OEM specifications or Chinese GB standards — measured on the finished leather.
Why it matters: Automotive interior air is the toughest air standard any material faces: a closed car in the sun. What passes there passes anywhere — in a living room, an office, a bag.
How to verify: Chamber test reports against the named norm. No finish is not an argument: the chamber decides, not the recipe.
05 — A clean ending
What it means: Two things. The leather itself biodegrades — proven under ISO 14855-1, tested on the leather as delivered, including its finish. And the tanning by-products are clean enough to qualify as certified input for organic farming.
Why it matters: Most materials answer only the first half, or neither. A tannery produces far more by-product than leather — where that goes decides whether a loop closes or just looks like one.
How to verify: An ISO 14855-1 certificate for the leather as delivered, plus certification or listing of the by-products as organic-farming input under EU organic regulation — a listing, not a self-declaration.
Clean is binary here
Five out of five is clean. Four out of five is not “almost clean” — it is leather with one open question. That can be a fine material and an honest answer. It is just not this definition. Our own table works the same way.
What this is not
A performance specification. The five criteria define chemistry, health and end of life — they say nothing about abrasion, light fastness, flex or ageing. Your performance spec stays exactly where it is. This definition answers a question your spec never asked.
How the criteria can change
They are versioned. Any change is published with its reasoning, in advance. They can be tightened as testing methods and regulation evolve — they will not be loosened to make our own material look better. Current version: 1.0.
FAQ
Could a chrome leather meet this definition?
In principle the definition is method-neutral — the actual chrome tanning salt even passes criterion 1. In practice, chrome struggles with criterion 5: chromium-bearing by-products cannot qualify for organic farmland. If any leather passes all five with documents, it meets the definition. That is what makes it a definition, not a brand.
Is leather that doesn’t meet this bad leather?
No. Not clean does not mean bad, unsafe or illegitimate — it means: does not meet this specific, documented definition. Every missing tick is an invitation; often the document simply was never requested.
How does this relate to OEKO-TEX and similar certificates?
They answer a different question — and they remain valuable. A residue certificate tells you that nothing harmful above limit values is in the finished article. This definition asks what the material is: what tans it, and what happens after its use. Where they overlap, an existing certificate can serve as part of the evidence.
Isn’t the documentation effort a hurdle?
It is — by design. A definition is worth exactly what it costs to claim it falsely. And the burden is smaller than it looks: hazard declarations exist by law, interior air tests are routine wherever automotive is supplied. What remains is an investment that disappears next to the value of a single major nomination.
Why documents instead of green words?
Also because the law is heading there: from 27 September 2026, EU rules (Directive 2024/825) prohibit generic environmental claims without proof and self-created sustainability seals in consumer communication. Specific, substantiated statements about clearly named aspects remain allowed — which is exactly what these five criteria are. This page is not a seal and will never be one; it is evidence, published.