How reliable is recycled plastic certification? The German UBA ranked 11 systems

If a package states that it contains 50% recycled plastic, there is currently no laboratory test that can verify this. No recognised chemical or physical method exists that reliably determines how much of a plastic item was made from waste. This is precisely why recycled plastic certification has become a critical issue: recyclate content can only be demonstrated indirectly, through documented traceability along the supply chain.

In August 2026 the German Federal Environment Agency (Umweltbundesamt, UBA) published a research report that, for the first time, systematically examined whether the certification systems on the market are actually capable of substantiating such claims. The study was carried out by the Ecologic Institut (Berlin) and the Institute for Energy and Circular Economy at Bremen University of Applied Sciences, and was completed in January 2026. The findings are sobering: the differences between the systems are substantial, and the biggest problem is often not a lack of rigour but the fact that from the outside it is impossible to determine how rigorous they actually are.

Why certification is needed at all

From a manufacturer’s perspective, using post-consumer recyclate (PCR) is more expensive, more cumbersome and technically less predictable than using virgin fossil-based material or post-industrial recyclate (PIR) from production waste. On business logic alone there is often no direct incentive to use PCR — which brings a heightened risk of inaccurate self-declarations about recyclate content.

Meanwhile regulatory pressure is rising. Article 7 of the EU Packaging and Packaging Waste Regulation (2025/40) sets specific recyclate quotas for the plastic fraction of packaging for the target years 2030 and 2040. Similar logic applies in the Battery Regulation (2023/1542), and public procurement increasingly favours products containing recycled material. Demand exists; verifiability does not.

This is where the chain of custody (CoC) comes in: the system does not measure the material itself but documents its journey from waste to finished product. Consequently, the credibility of a certificate rests entirely on the quality of administrative and audit processes. If the audit is superficial, paperwork will carry almost anything.

What the German environment agency examined

The research proceeded in three stages. First the market was mapped: 34 relevant certification systems were identified, operating at various points along the plastics value chain. Ten of these were selected for in-depth analysis.

In the second stage every system was examined against the same structured checklist. It covered information availability, the object of certification, traceability of recyclate origin, storage management and mass balance, environmental aspects, social responsibility and occupational health and safety, organisational processes, certification and audit procedures, requirements for certification bodies and auditors, the system owner’s own control mechanisms, the handling of non-conformities, and complaints management.

One methodological detail matters a great deal: the researchers contacted every system owner to fill information gaps, following up at least twice. Of the ten systems approached, only four provided substantive additional information, five gave no substantive response at all, and one declined citing lack of capacity.

In the third stage the assessment was broken down into 75 indicators. Scoring is essentially binary (fulfilled / not fulfilled), but each indicator carries a weighting factor from 1 to 4. The highest weighting was assigned, among others, to the integration of ISO 14001 environmental management elements, detailed mass balance calculation, and whether an on-site audit by an independent third party is mandatory — as well as whether the system permits remote audits in place of physical inspection. In that last case “no” is the positive answer: remote auditing offers less depth, because physical material flows and production processes cannot be meaningfully verified from a distance.

A practice-oriented search was also carried out, looking through legal databases, trade publications, news media and NGO reporting for known shortcomings or misconduct associated with the systems.

The ten systems under review

• flustix RECYCLED – DIN-Geprüft (DIN CERTCO)
• Global Recycled Standard, GRS (Textile Exchange)
• ISCC PLUS (ISCC System GmbH)
• LNE Incorporation of Recycled Plastic Materials (French national metrology institute)
• Materials Matter Standard Pilot V1.0 – Recycled, MMS (Textile Exchange)
• OBP Recycling Subprogram (Zero Plastic Oceans)
• PSV brand recycled content certification (IPPR, Italy)
• QA-CER Recycled content (BQA, Belgium)
• RecyClass Recycling Process Certification (Plastics Recyclers Europe)
• SCS Certification Standard for Recycled Content (SCS Standards)

RecyClass offers two sequential levels, which is why the final ranking contains eleven entries.

The recycled plastic certification ranking

Applying the chosen weighting scheme produced the following order (points in brackets):

1. RecyClass Recycling Process Certification Level 2 — 162 points
2. RecyClass Recycling Process Certification Level 1 — 141 points
3. Global Recycled Standard — 140 points
4. Materials Matter Standard Pilot V1.0 (Recycled) — 135 points
5. ISCC PLUS — 130 points
6. LNE Incorporation of Recycled Plastic Materials — 123 points
7. OBP Recycling Subprogram — 121 points
8. PSV brand recycled content certification — 87 points
9. SCS Certification Standard for Recycled Content — 82 points
10. QA-CER Recycled content — 74 points
11. flustix RECYCLED – DIN-Geprüft — 65 points

Two very different things hide behind these numbers. A negative score means either that a system demonstrably fails to meet a requirement, or that the lack of information made assessment impossible. For QA-CER, flustix RECYCLED and PSV it is typically the latter: few public documents were available and attempts at contact were unsuccessful. The researchers do not treat this as an excuse but as a problem in its own right — reliable communication and transparent documentation are themselves preconditions of credibility.

SCS is a different case. Cooperation was eventually established after initial difficulties, but the standard simply contains no defined requirements for a number of indicators.

Even the front-runner is not flawless. RecyClass lacks the option of additional unannounced on-site audits, and most requirements relating to social responsibility and occupational health and safety are absent.

Five models, varying strictness

All ten systems apply some form of chain of custody model, but their strictness differs sharply. ISO 22095 distinguishes five models. The strictest are identity preservation and segregation, where secondary material is kept separate throughout. In practice, however, most plastic products are blends of virgin and recycled material, which makes “controlled blending” or mass balance accounting the more workable options.

Under mass balance, a producer feeds a given quantity of recyclate into the system and may label a corresponding quantity of output as certified — even if that specific item does not physically contain that material. In the still more permissive “book-and-claim” model, physical and accounting flows are fully decoupled.

The systems examined fall into two camps. RecyClass, flustix RECYCLED and LNE build explicitly on the European standard EN 15343, which is tailored to plastics and corresponds to controlled blending. GRS, MMS and ISCC PLUS refer to the more general ISO 22095, which also permits more flexible models — they impose functionally similar requirements but are not tied to a material-specific standard. QA-CER and PSV show clear deficits here: either normative references are missing, or their requirements are not translated into traceable operational procedures.

The distinction matters for buyers. It is not the same thing to certify that a specific product contains recyclate and to certify that a producer purchased enough recyclate overall to account for its output.

Environmental and social requirements: a wide spread

This may be the most surprising finding. Only a few systems impose environmental requirements on the recycling process itself. Textile Exchange’s two standards, GRS and MMS, stand out with comprehensive approaches to emissions control, resource efficiency and waste prevention. RecyClass — particularly at Level 2 — also integrates substantial environmental requirements, for instance by linking to the ISO 14001 environmental management standard.

ISCC PLUS, LNE and OBP, by contrast, set no comprehensive environmental management requirements for the recycling process, which explains their somewhat lower scores; otherwise they perform comparably.

On social responsibility and occupational health and safety, GRS and MMS again stand out, with provisions on the exclusion of child labour, protection against discrimination and working time. OBP sets basic minimum requirements for informal waste collectors, with optional extensions. RecyClass handles the question selectively: mandatory for sites based outside the EU (EU27+3), optionally extendable elsewhere.

In short, a “recycled content” certificate on its own says nothing about the environmental burden of the recycling process or the working conditions under which it took place.

Audit quality determines credibility

Since physical proof is unavailable, everything depends on verification — and here too the spectrum is wide. Some systems mandate on-site audits with clear expectations on frequency and depth. Others allow remote audits, and some simply do not regulate the question clearly.

Certificate validity ranges from one to five years. A five-year term is not inherently a problem if meaningful annual surveillance audits take place, but longer terms often go hand in hand with less frequent control intervals.

Unannounced audits deserve separate mention. They are one of the most important instruments for preventing fraud, yet only a few systems provide for them. The researchers conclude that only systems with a high degree of formalisation and comprehensive audit protocols can guarantee the necessary depth and quality of verification.

When the standard owner is also the certifier

Most of the systems examined require certification bodies to be accredited under ISO/IEC 17065 or ISO/IEC 17021-1. That is a sound basis for independence.

In three cases, however — QA-CER, LNE Recycled Plastic and flustix RECYCLED — the system owner also acts as the certification body. This absence of institutional independence carries an inherent risk of conflicts of interest, which may in turn affect the validity of audit results.

The picture is similar for internal control mechanisms. Some systems review their certification bodies regularly; for others, such as flustix RECYCLED or QA-CER, little meta-control is documented. Public registers, which would allow verification of recognised certification bodies and companies holding valid certificates, are also only partly available. Without them, outsiders cannot see whether a certificate was actually issued, renewed, or withdrawn.

What happens in case of non-conformity?

Formally, every system has procedures for suspending or withdrawing a certificate in the event of serious breaches. The specific requirements and criteria, however, are frequently poorly documented. Most systems allow a deadline for corrective action, but only a few prescribe comprehensive re-evaluation. Transparent communication of withdrawals and access to an external complaints body are rare — which can create legitimacy gaps when disputes arise.

All systems document a procedure for third-party complaints, but the level of detail varies considerably. Provisions on impartiality are broadly consistent; access to an external arbitration instance is not, and tends to be missing precisely where the system operator acts as its own certification body.

What this means in practice

A few usable conclusions for manufacturers, distributors and procurement officers:

The existence of a certificate is not enough information. Check which system it is, which CoC model it uses, who the certification body is, and whether the certification actually covers the claim you want substantiated. A process certification (such as RecyClass) supports a different claim than a product-level recycled content certificate.

Public documentation is itself a quality signal. If it is impossible to determine from the outside what requirements a system imposes and how it verifies them, that is a risk factor in its own right — regardless of whether internal practice happens to be sound.

Ask about on-site audits. Are they mandatory, how often, are unannounced inspections possible, how long is the certificate valid?

The ranking is not absolute. The scores reflect the weighting the researchers chose. If social requirements matter most to you, the Textile Exchange standards move up; if only the control of the mechanical recycling process matters, RecyClass does. The methodology was designed to be adaptable for exactly this reason.

Verify that a certificate is valid. Where a public register exists this takes minutes. Where it does not, independent verification is effectively impossible.

Limitations of the study

The researchers are explicit about the limits of their claims.

The analysis is document-based. It examines what a system prescribes, not how it is actually implemented. A formally strict system can still operate loosely if auditors are superficial.

The search for practical shortcomings found no publicly accessible evidence of deficiencies in any of the systems examined. The report does not treat this as exoneration: the absence of documented cases does not mean none occurred.

Data collection reflects the situation as of October 2024, and certification systems revise their requirements regularly. The analysis is a snapshot that would need continuous updating.

Finally, the systems differ in purpose and scope — some are tailored to textiles, some specialise in ocean-bound waste, some do not distinguish PCR from PIR origin at all. This functional heterogeneity complicates direct comparison, and it is why the researchers argue that an objective aggregate ranking is only meaningful when evaluation priorities are clearly defined.

That uncertainty is itself an important message. As long as no direct measurement method exists to verify recyclate content, the system runs on trust — and the quality of that trust comes from transparency, independent verification and public accountability. Perhaps the most important result of the German analysis is not the ranking but the recognition that all three are missing from several certification systems still in use on the market today.

Frequently asked questions – recycled plastic certification

Why can’t a laboratory measure the recycled plastic content of a product?

No recognised chemical or physical method currently exists that reliably determines the recyclate content of a plastic product. Verification is therefore only possible indirectly, through documented traceability along the supply chain — that is, chain of custody systems. This means the credibility of a certificate rests entirely on the quality of record-keeping and audit processes.

Which certification system performed best in the UBA assessment?

RecyClass Recycling Process Certification Level 2 came first with 162 points, followed by RecyClass Level 1 (141 points) and the Global Recycled Standard (140 points). The ranking reflects the weighting the researchers chose, however, and is not an absolute quality verdict. Under different evaluation priorities the order would shift substantially.

What does mass balance accounting mean?

Under mass balance, a producer feeds a given quantity of recyclate into the process and may then label a corresponding quantity of output as certified — even if that specific item does not physically contain the material. It is more permissive than identity preservation or segregation, but for most blended plastic products it is effectively the only workable option.

Why did flustix RECYCLED and QA-CER score low?

Mainly because of missing information. Few public documents were available for either system, and the researchers received no substantive response to their enquiries, so many indicators could not be assessed. In both cases the system owner also acts as the certification body, which carries a conflict of interest risk.

How current is the German UBA analysis?

Data collection reflects the situation as of October 2024; the report was completed in January 2026 and published in August 2026. Certification systems revise their requirements regularly, which is why the researchers themselves describe the analysis as a snapshot that would require continuous updating.

Source:

Heni, Y., Knoblauch, D., Rechlin, A., Spuziak-Salzenberg, D., Wittmaier, M., Wolff, S. (2026): Analyse und Bewertung von Zertifizierungssystemen für Recycling-Kunststoffe. Umweltbundesamt, TEXTE 130/2026, Dessau-Roßlau. DOI: 10.60810/openumwelt-8427