Understanding Substance of Concern Under ESPR

What is a Substance of Concern?

Under the Ecodesign for Sustainable Products Regulation (ESPR), a substance of concern is any chemical substance present in a product that poses a potential risk to human health or the environment, or that may impede circularity by complicating recycling, reuse, or safe end-of-life treatment. The ESPR casts a deliberately wide net with this definition, going beyond the traditional focus on acutely hazardous chemicals to encompass substances that hinder the transition to a circular economy.

The concept builds upon existing EU chemical safety legislation, primarily REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) and the CLP Regulation (Classification, Labelling and Packaging), but extends the transparency obligation. Where REACH restricts or regulates specific substances, the ESPR requires that manufacturers disclose the presence of substances of concern in their products through Digital Product Passports, even when those substances are legally permitted.

This disclosure requirement represents a paradigm shift. Previously, manufacturers were required to restrict banned substances and manage hazardous ones, but had no general obligation to declare all substances of concern present in their products. The ESPR changes this, creating an expectation of proactive transparency that enables informed decision-making by consumers, recyclers, and downstream businesses.

Categories of Substances of Concern Under ESPR

The ESPR defines substances of concern by reference to several categories established in existing EU legislation. Understanding these categories is essential for identifying which substances in your products require declaration.

• Substances of Very High Concern (SVHCs): Substances identified under REACH Article 57, including carcinogens, mutagens, reproductive toxicants (CMRs), persistent bioaccumulative toxic substances (PBTs), very persistent very bioaccumulative substances (vPvBs), and substances of equivalent concern such as endocrine disruptors.
• Substances restricted under REACH Annex XVII: Chemicals whose use is restricted in specific applications due to unacceptable risks to health or the environment.
• Substances classified as hazardous under CLP: Chemicals meeting classification criteria for physical, health, or environmental hazards under the CLP Regulation.
• Substances that negatively affect recyclability: A newer category specific to the ESPR, covering substances that contaminate recycling streams, degrade material quality during recycling, or require special treatment that increases recycling costs.

The fourth category is particularly noteworthy because it extends the concept of "concern" beyond traditional toxicological considerations to encompass circularity impacts. A substance might be perfectly safe in use but still qualify as a substance of concern if it renders the product difficult or impossible to recycle effectively.

Disclosure Requirements in the Digital Product Passport

The ESPR requires that Digital Product Passports contain detailed information about substances of concern present in the product. The specific disclosure requirements will be defined in delegated acts for each product category, but the general framework established by the regulation is comprehensive.

For each substance of concern present above applicable concentration thresholds, the DPP must typically declare:

• Chemical identity: The substance name and its unique identifiers (CAS number, EC number).
• Location within the product: Which specific component or material contains the substance, enabling targeted handling during repair, reuse, or recycling.
• Concentration: The amount of the substance present, expressed as a weight percentage or mass per unit.
• Hazard classification: The substance's classification under CLP, including hazard statements and pictograms.
• Safe handling instructions: Any specific precautions needed when handling, repairing, or dismantling the product due to the presence of the substance.

This level of detail goes well beyond current labelling requirements and represents a significant data collection challenge for manufacturers. For a detailed examination of this topic, refer to our comprehensive substances of concern guide.

Identifying Substances of Concern in Your Products

Many manufacturers are uncertain about the full chemical composition of their products, particularly for complex assemblies incorporating components from multiple suppliers. Identifying all substances of concern requires a systematic approach that spans the entire supply chain.

The first step is to compile a full material declaration for each product. This involves collecting composition data from every supplier for every component, including detailed information about materials, coatings, adhesives, inks, and surface treatments. Industry data exchange standards such as IPC-1752A (for electronics) and IMDS (International Material Data System, for automotive) can facilitate this process.

Next, screen the collected composition data against the relevant substance lists. The ECHA (European Chemicals Agency) maintains the candidate list of SVHCs, the authorisation list, and the restriction list under REACH. The CLP classification database provides hazard classifications. Purpose-built software tools can automate this screening process, flagging substances that require declaration.

For the ESPR's additional category of substances that impede recyclability, the screening process is less well established. Manufacturers may need to engage with recycling operators and industry associations to understand which substances in their specific product category are considered problematic for recycling processes.

This identification process should be embedded in your product development workflow, not treated as a one-time compliance exercise. New products should be screened during the design phase, allowing substance substitution before production begins.

Supply Chain Data Collection Challenges

The most significant practical challenge in substance of concern compliance is collecting reliable composition data from the supply chain. Multi-tier supply chains, particularly those with global reach, present formidable data collection obstacles.

Tier-one suppliers (those with direct contractual relationships) can usually be engaged through contractual requirements and established data exchange mechanisms. However, the substances of concern may be introduced at tier-two or tier-three level, for example, a chemical additive in a plastic compound used to mould a component. Reaching these deeper supply chain tiers requires either cascading data requests through each supplier level or implementing industry-wide data platforms.

Confidentiality concerns further complicate data collection. Suppliers may be reluctant to disclose detailed formulations that they consider proprietary. The ESPR acknowledges this tension and provides for mechanisms to share substance of concern data without revealing complete formulations, but practical implementation requires trust and clear data governance agreements.

Small and medium-sized enterprises (SMEs) within supply chains may lack the technical capability or resources to provide detailed composition data. Supporting these suppliers, through training, simplified data collection tools, or financial assistance, is often necessary to achieve complete data coverage.

Industry initiatives are emerging to address these challenges. Sector-specific databases, material passports, and blockchain-based data sharing platforms aim to make substance of concern data more readily available across supply chains. Manufacturers should engage with relevant industry associations and data platforms in their sector.

Impact on Product Design and Material Selection

The ESPR's substance of concern transparency requirements are intended to drive changes in product design and material selection. When consumers, procurers, and regulators can see exactly which substances of concern are present in a product, market pressure for safer, more recyclable alternatives intensifies.

Progressive manufacturers are using the ESPR as a catalyst to review and reformulate their products. Common substitution strategies include:

• Replacing brominated flame retardants with phosphorus-based or mineral alternatives that do not contaminate plastic recycling streams.
• Eliminating heavy metals (lead, cadmium, mercury) from coatings and pigments in favour of less toxic alternatives.
• Substituting PVC (polyvinyl chloride) with more recyclable polymers where technically feasible.
• Replacing per- and polyfluoroalkyl substances (PFAS) with alternative surface treatment technologies.
• Reducing the use of complex adhesives that complicate material separation during recycling.

These substitutions are not always straightforward. Alternative materials may have different performance characteristics, higher costs, or their own environmental trade-offs. Lifecycle assessment and environmental footprint analysis should inform substitution decisions to avoid unintended consequences.

The DPP disclosure requirement also creates a commercial incentive for "clean" products. Products with shorter substance of concern declarations may be preferred by procurement departments, retailers, and consumers who are increasingly chemical-safety conscious.

Substance of Concern Tracking Systems

Effective compliance with ESPR substance of concern requirements demands systematic tracking capabilities. Manual processes, spreadsheets and ad hoc supplier requests, are inadequate for anything beyond the simplest product portfolios.

A substance of concern tracking system should provide several core capabilities:

• Centralised substance database: A master list of all substances of concern, drawn from REACH, CLP, and ESPR-specific lists, with automated updates as regulatory lists are revised.
• Product composition management: The ability to maintain detailed material composition records for every product, linked to bill of materials data.
• Automated screening: Comparison of product composition data against substance of concern lists, flagging matches and generating reports.
• Supplier data portal: A mechanism for suppliers to submit composition data in standardised formats, with validation and quality checks.
• DPP integration: Direct export of substance of concern declarations in the format required by your DPP system.
• Change management: Tracking of regulatory list updates and assessment of their impact on existing products.

Several commercial software platforms offer substance of concern management capabilities, including those specifically designed for REACH compliance. As the ESPR comes into effect, these platforms are adding DPP export and ESPR-specific functionality. Evaluating and selecting appropriate tools should be a priority for compliance programme planning.

Regulatory Context and Related Legislation

The ESPR's substance of concern provisions do not operate in isolation. They intersect with several other pieces of EU legislation that manufacturers must navigate.

REACH remains the primary regulatory framework for chemical substance management in the EU. Substances restricted under REACH cannot be used above specified concentrations, regardless of the ESPR. The ESPR adds a transparency obligation on top of REACH's restriction framework, manufacturers must declare the presence of substances of concern even when their use is legally permitted.

The CLP Regulation governs how substances are classified and labelled based on their hazard properties. CLP classifications feed directly into the ESPR's substance of concern definitions. Any substance classified as hazardous under CLP that is present in a product above applicable thresholds must be declared in the DPP.

The ESPR text also references the Waste Framework Directive's SCIP database (Substances of Concern In articles as such or in complex objects (Products)). Since January 2021, suppliers of articles containing SVHCs above 0.1% weight/weight have been required to notify the SCIP database. The DPP builds upon and extends this notification requirement.

Understanding how these regulatory frameworks interact is essential for building an efficient compliance programme. Data collected for REACH compliance can be leveraged for ESPR substance of concern declarations, and vice versa, reducing duplication of effort.

Preparing for Substance of Concern Compliance

With the ESPR's substance of concern provisions set to take effect as delegated acts are published for specific product categories, manufacturers should begin preparation now. The data collection, supply chain engagement, and system implementation required cannot be accomplished overnight.

Start with a materiality assessment: identify which of your products are most likely to contain substances of concern and which product categories will be subject to ESPR delegated acts earliest. Focus initial efforts on these priority products.

Engage your supply chain proactively. Send substance of concern data requests to key suppliers, explain the regulatory drivers, and establish clear timelines and formats for data submission. The earlier you begin this dialogue, the more time suppliers have to gather and verify their own composition data.

Invest in appropriate tracking and management tools. Whether you choose commercial software, build custom solutions, or leverage industry data platforms, the ability to systematically manage substance of concern data is a prerequisite for DPP compliance.

Finally, review your product design pipeline. Are there opportunities to substitute substances of concern with safer alternatives before ESPR requirements take effect? Proactive reformulation avoids the scenario of having to declare large numbers of substances of concern in your DPP while competitors have already moved to cleaner formulations. Understanding the ESPR compliance timeline will help you prioritise these activities according to your sector's deadlines.

Substance of concern transparency under the ESPR is more than a regulatory box to tick. It is a signal to the market about the chemical safety and recyclability of your products. Manufacturers who embrace this transparency, and use it as a driver for continuous improvement in product composition, will build stronger brands, deeper customer trust, and more resilient businesses in the evolving regulatory landscape.