Biodegradable. Compostable. Certified. What Do These Words Actually Mean — And Who Is Checking?
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The Risk Of Vague Claims
There are hundreds of sustainability labels, standards and claims in the market today. Some are backed by rigorous independent verification, decades of scientific standards and credible third-party auditing. Others are backed by a marketing department. The problem is that from the outside, they can look identical.
For procurement teams, sustainability managers and business leaders trying to make genuinely better decisions, this is not a minor inconvenience. It is a material risk — commercially, legally and reputationally.
The EU and UK are both tightening rules around environmental claims. Greenwashing is moving from a reputational risk to a legal one. And the organisations that built supplier relationships on vague sustainability language are increasingly exposed.
Understanding what certifications and claims actually mean is no longer just due diligence. It is competitive protection.
The Word That Means Almost Nothing: Biodegradable
Of all the terms in sustainable procurement, biodegradable may be the most misunderstood — and the most misused. A biodegradable material is technically capable of breaking down through the action of microorganisms. That sounds reassuring. But biodegradable tells you almost nothing useful on its own.
- It does not tell you how long the process takes.
- It does not tell you what conditions are required.
- It does not tell you whether harmful residues remain once the material breaks down.
- It does not tell you whether the material breaks down completely at all.
A product labelled biodegradable may take decades to decompose under real-world conditions. It may require industrial processing to break down at any meaningful rate. It may leave behind microplastics, chemical residues or fragments that persist in soil and waterways long after the label promised otherwise.
Biodegradable, without qualification, is a description of potential — not a guarantee of outcome.
The Word That Means Something Specific: Compostable
Compostable is a more meaningful term, but only when it is properly understood and independently verified. A compostable product is designed to break down into natural materials under specific composting conditions, leaving behind no toxic residue and returning nutrients to the soil.
But here is the distinction that matters most in practice — and that most buyers miss:
Products requires controlled composting facilities with carefully managed temperatures and conditions. They will not break down effectively in a home compost bin, in landfill or in the natural environment. If your customers are not sending waste to industrial composting facilities, the claims delivers little real-world benefit.
Products are designed to break down in a standard home composting environment, without any specialised infrastructure. This is a significantly higher bar — and the certifications that verify it are more stringent as a result.
The practical question for every buyer is not just whether a product is compostable. It is: compostable under what conditions, and does that infrastructure actually exist for your customers?
Certifications: What They Verify, And What They Do Not
Certifications exist to provide independent verification — moving sustainability decisions beyond marketing claims and into evidence. But certifications vary enormously in scope, rigour and what they actually assess.
Verifies that wood, paper and forest-based products originate from responsibly managed forests. Covers biodiversity protection, sustainable forest management and responsible sourcing practices. One of the most established and globally recognised environmental certifications.
A comparable forestry certification to FSC, also globally recognised. Products may carry one or both, depending on the supplier and supply chain.
Verifies recycled content and responsible social, environmental and chemical practices throughout production. Commonly applied to recycled plastics, textiles and packaging materials. Important for buyers navigating the UK Plastic Packaging Tax, where recycled content percentage directly affects tax liability.
Does not certify a specific product. Instead, it verifies that an organisation has environmental management systems in place to manage impacts and drive continuous improvement. A signal of organisational commitment rather than product-level assurance.
The European standard for industrial compostability. A product carrying this certification has been independently tested to verify it breaks down under industrial composting conditions within a defined timeframe, leaving no harmful residue.
A more stringent certification, verifying home compostability under lower, less controlled temperatures. Significantly harder to achieve than industrial compostability certifications, and considerably more meaningful for end-of-life claims directed at consumers.
Assesses the overall social and environmental performance of a business, rather than a specific product. Covers governance, workers, community, environment and customers. A useful signal of organisational values but not a substitute for product-level verification.
Why Certifications Are Necessary But Not Sufficient
A certification is an important signal. It is not the complete picture. The most commercially rigorous procurement decisions consider certifications alongside product composition, supplier practices, supporting evidence and end-of-life outcomes. A certified product from a supplier with opaque practices, unverified data and no PFAS-free declaration is still a risk.
The questions every procurement team should be asking before purchasing products marketed as sustainable:
- Is there independent third-party certification, and from whom? Self-declared sustainability claims carry no independent verification. Check who issued the certification and what standard it was issued against.
- Is it industrially or home compostable? The distinction determines whether the end-of-life claim is meaningful for your customers and your supply chain.
- What is the product actually made from? Material composition drives cost, performance, regulatory exposure and genuine environmental impact simultaneously.
- What disposal infrastructure exists? The most sustainable product in a region with no appropriate disposal infrastructure delivers less real-world benefit than a less sophisticated product that can actually be processed.
- What happens if the claim is wrong? Under tightening EU and UK greenwashing regulations, the reputational and legal exposure from an unsubstantiated sustainability claim sits with the business that made it — not just the supplier that provided it.
The Bigger Picture
Certifications are tools, not answers. The organisations building genuine competitive advantage in sustainable procurement are not simply buying certified products and considering the job done.
- They are asking what the certification actually verifies.
- They are understanding the difference between industrial and home compostable.
- They are looking at the full lifecycle of a product from material sourcing through to end-of-life.
- They are building supplier relationships grounded in evidence rather than marketing language.
Because the cost of getting this wrong is rising. Regulatory scrutiny is increasing. Customer expectations are hardening. And the gap between what a label claims and what a product delivers is increasingly where legal, commercial and reputational risk accumulates.
Understanding the language of sustainable procurement is not a specialist skill anymore. It is a baseline business capability.
At Circolis, every product in our marketplace is assessed against defined certification requirements, material standards and supplier verification — through our Sustainability Passport framework. Because the goal is not to make sustainable procurement easier to claim. It is to make it easier to prove.