EU Chemical Customs Compliance | CUS Code & ECICS
When exporting chemicals to the European Union, companies may be asked to provide a CUS Code, also known as a Customs Union and Statistics Code, during customs declaration. The CUS Code helps customs authorities identify chemical substances and supports smoother chemical customs clearance in the EU.
This article explains what a CUS Code is, when it may be required, how to search for it in the European Customs Inventory of Chemical Substances (ECICS), and what companies can do if their chemical is not listed.
Introduction | What Is a CUS Code? | When Is It Needed? | How to Search | No CUS Code? | How REACH24H Can Help
Introduction
Exporting chemicals to the EU involves more than tariff classification and transport documentation. Importers, exporters, freight forwarders and logistics service providers may need to provide accurate chemical identifiers, product descriptions and customs data to support EU customs declaration and safety and security filing.
In this context, the CUS Code is frequently used as a practical identifier for chemical substances listed in ECICS. For companies exporting chemical substances, mixtures or preparations to the EU, understanding how to search and use the correct CUS Code can help reduce customs clearance delays and improve communication with customs authorities.
The CUS Code does not replace other EU chemical compliance obligations. Companies should still assess whether their products trigger EU REACH registration, EU CLP classification and labeling, SDS and GHS communication, and other market access requirements.
What Is a CUS Code?
The CUS Code is linked to the European Customs Inventory of Chemical Substances (ECICS), an information tool managed by the European Commission’s Directorate-General for Taxation and Customs Union (DG TAXUD). ECICS supports customs classification, identification and description of chemical substances.
Each chemical substance listed in ECICS is assigned a unique eight-digit CUS Code, separated by a hyphen, such as 0011481-8 for barium sulfide. The code is used for database searches and communication with customs authorities.
| Identifier | Main Use | Why It Matters for EU Export |
|---|---|---|
| CUS Code | Chemical identification in ECICS and customs communication. | Helps identify pure substances during EU customs declaration. |
| CAS RN | International chemical substance identifier. | Can be used to search ECICS and support substance identity confirmation. |
| EC Number | EU chemical inventory identifier. | Useful for aligning ECICS information with EU chemical regulatory records. |
| CN Code | Customs tariff classification. | Supports tariff classification and customs declaration, but is not the same as a CUS Code. |
Compliance note: A CUS Code is a customs-related identifier. It should not be confused with REACH registration numbers, EC numbers, CAS numbers, CN codes, UFI codes or product registration numbers.
When Is a CUS Code Required?
For pure substances, companies are strongly encouraged to provide the designated CUS Code and the correct chemical name listed in ECICS during customs clearance. This helps customs authorities identify the substance more accurately and reduces ambiguity in customs declarations.
For mixtures and preparations that do not have a specific CUS Code, businesses are advised to provide a detailed product description. The description should explain the mixture’s composition, for example by using terms such as “solution of ... in ...”, “mixture of ... and ...”, “based on ...” or “containing ...”, and should preferably include the CUS Codes of individual components where available.
| Product Type | Recommended Declaration Approach | Information to Prepare |
|---|---|---|
| Pure substance | Provide the CUS Code and the ECICS-listed chemical name where available. | Chemical name, CAS RN, EC number, CUS Code, CN code, SDS and intended use. |
| Mixture or preparation | Provide a precise product description and identify relevant components where possible. | Composition, component names, CAS RN, component CUS Codes, SDS and product use. |
| Product not listed in ECICS | Prepare supporting information and consider contacting relevant authorities for customs classification support or CUS Code inclusion. | Product description, composition, chemical structure, SDS, intended use and supporting identity data. |
How to Search for a CUS Code
Companies can search for CUS Codes through the ECICS official consultation platform. The platform allows users to search chemical substance information using identifiers such as CAS RN, CUS, CN code, EC Number, UN Number, chemical name, InChI and InChIKey.
Visit the ECICS official website.
Enter the chemical's name, CAS number, EC number, CN code or other identifying information in the search field.
Review the search results and confirm whether the substance identity matches your product.
Record the CUS Code and the exact chemical name listed in ECICS for customs communication.
Cross-check whether other regulatory obligations apply, such as EU REACH, EU CLP, SDS or dangerous goods transport requirements.
Practical tip: Search results should be checked carefully. A similar name or partial match does not always mean the CUS Code is appropriate for your product. Substance identity, composition, CAS RN, EC number and intended use should be verified before customs declaration.
What If a Substance Cannot Be Found in ECICS?
If a substance cannot be found in ECICS, companies may contact the relevant authorities and provide detailed supporting information. If the information is sufficient, authorities may propose a customs classification and initiate the process of including the substance in the ECICS database.
Assigning a new CUS Code can take several months, depending on the complexity of the substance and the completeness of the supporting information. Therefore, exporters should evaluate CUS Code availability early, especially before large-volume shipments, new product launches or EU customer onboarding.
| Information Type | Examples | Why It Matters |
|---|---|---|
| Substance identity | Chemical name, CAS RN, EC number, molecular formula, structure and composition. | Helps confirm whether the substance is already listed under another name or identifier. |
| Product information | Product description, purity, impurities, mixture composition and intended use. | Supports customs classification and differentiation from similar substances or mixtures. |
| Safety and regulatory documents | Safety Data Sheet, GHS classification, label, transport classification and relevant regulatory status. | Helps identify whether the product may require particular attention from customs or safety authorities. |
| Trade context | Importer, exporter, EU destination, expected volume and product application. | Helps support practical customs communication and shipment planning. |
Common Risks in CUS Code Use
Using an incorrect match: selecting a CUS Code based only on a similar name may lead to customs questions or incorrect declaration.
Ignoring mixture composition: mixtures may not have their own CUS Code, but component CUS Codes and a clear composition description may still be helpful.
Confusing CUS Code with CN code: a CUS Code identifies a chemical substance in ECICS, while a CN code is used for tariff classification.
Late application: requesting a new CUS Code close to shipment may not leave enough time, as the process can take several months.
Overlooking broader EU compliance: CUS Code availability does not confirm compliance with EU REACH, CLP, SDS, labeling or transport requirements.
Need to confirm the correct CUS Code before exporting chemicals to the EU?
REACH24H can help you search ECICS, verify substance identity, prepare supporting documents and assess related EU customs and chemical compliance obligations.
Contact Our Regulatory SpecialistsHow REACH24H Can Help
REACH24H provides CUS Code inquiry and application support for companies exporting chemicals to the EU. Our support can also be integrated with broader EU chemical compliance services, including EU REACH, EU CLP, SDS and label compliance, transport classification and customs communication.
| Support Area | REACH24H Services |
|---|---|
| CUS Code Inquiry | Search ECICS using chemical name, CAS RN, EC number, CN code or other identifying information and verify the appropriate CUS Code. |
| CUS Code Application Support | Support data collection, document preparation, authority communication and follow-up where no suitable CUS Code is available. |
| Substance Identity Review | Review chemical name, CAS RN, EC number, formula, structure, composition and SDS to support accurate customs communication. |
| EU REACH and CLP Compliance Check | Assess whether the same product also requires EU REACH registration, EU CLP compliance, or other EU market access support. |
| SDS and Label Review | Prepare or review SDSs, GHS labels and transport-related information through Global GHS/SDS/MSDS/Label Compliance support. |
| Integrated EU Market Access Review | Support customs data, chemical regulatory obligations, shipment planning and supply chain communication for EU-bound chemical products. |
Final Thoughts
Understanding and correctly using CUS Codes is important for smooth customs clearance when exporting chemicals to the EU. Companies should verify CUS Code availability, use accurate ECICS-listed names, provide clear product descriptions for mixtures, and prepare supporting documents early where a new CUS Code may be needed.
At the same time, CUS Code management should be treated as part of a broader EU market access strategy. Exporters should also review REACH registration status, CLP classification, SDS and label compliance, dangerous goods transport requirements and downstream customer communication.
Recommended Reading
CUS Code (Customs Union and Statistics Code) Inquiry & Application
What Are the Differences Between Articles and Substances/Mixtures Under EU REACH
New Hazard Classes Introduced in EU CLP Regulation: What You Need to Know
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