For companies that have already completed EU REACH registration and plan to continue exporting chemicals to Turkey, KKDIK should not be treated as a simple copy of an EU REACH dossier. KKDIK, often referred to in industry practice as Turkey REACH, is a separate Turkish regulatory framework. An EU REACH registration number cannot replace a KKDIK registration arrangement.
However, existing EU REACH data may provide significant value for KKDIK compliance. If substance identity, tonnage coverage, study quality, data ownership, Letter of Access scope and Turkish expert review requirements are properly addressed, EU REACH data may help companies reduce unnecessary repeat testing, improve cost predictability and support continuity of supply to the Turkish market.
This article explains the key differences between KKDIK and EU REACH, how EU REACH data may be reused under KKDIK, what companies should review before relying on a Letter of Access, and how to plan registration routes in view of the 2026–2030 KKDIK timeline.
KKDIK is Turkey's REACH-like chemical regulation, but it is legally separate from EU REACH. EU REACH registration numbers cannot be used as KKDIK registration numbers. Existing EU REACH data may support KKDIK registration only when the company has the legal right to use the data for KKDIK/Turkey, and when the data is scientifically relevant, localized for the Turkish system and reviewed by qualified Turkish experts where required.
Need to confirm whether your EU REACH data can support KKDIK registration?
Contact REACH24HWhy EU REACH Registration Does Not Replace KKDIK
KKDIK stands for Kimyasalların Kaydı, Değerlendirilmesi, İzni ve Kısıtlanması, commonly translated as the Regulation on the Registration, Evaluation, Authorisation and Restriction of Chemicals.
Although KKDIK is largely aligned with the EU REACH framework in its structure and technical approach, the two systems belong to different jurisdictions. EU REACH is the EU regulatory framework for chemicals, while KKDIK is administered in Turkey by the Ministry of Environment, Urbanization and Climate Change.
In practical terms, this means:
EU REACH registration does not automatically provide market access in Turkey;
an EU REACH registration number cannot be used as a KKDIK registration number;
an EU REACH dossier cannot be submitted directly into Turkey’s Chemical Registration System without local adaptation;
EU REACH data access rights do not automatically cover KKDIK or Turkey;
Turkish-language documentation and qualified Turkish expert involvement may be required.
In general, companies should assess KKDIK registration obligations for substances manufactured in or imported into Turkey at one tonne or more per year. This may include substances on their own, substances in mixtures and substances intended to be released from articles, depending on the specific supply chain and product structure.
For non-Turkish manufacturers, KKDIK obligations are typically managed through Turkish importers or a Turkish Only Representative. REACH24H provides dedicated KKDIK Turkey REACH registration and Only Representative services to support companies with market access, registration planning and supply chain coverage.
KKDIK vs EU REACH: Key Differences Companies Should Not Overlook
EU REACH data can be an important foundation for KKDIK registration. However, KKDIK compliance does not mean copying an EU dossier into a Turkish system. Companies need to consider the differences in authority, platform, language, expert involvement, SDS requirements and data authorization.
Regulatory authority
European Chemicals Agency and EU Member State authorities
Turkey’s Ministry of Environment, Urbanization and Climate Change
Different authority, administrative procedure and regulatory communication route
Submission platform
REACH-IT / IUCLID
Chemical Registration System, KKS
EU dossier information must be adapted and entered into the Turkish system
Language
Technical materials are commonly prepared in English
Turkish-language submission and local documentation requirements apply
Study summaries, CSR-related content, exposure information and SDS/GBF may require professional translation and review
Expert involvement
EU REACH dossier preparation does not have an equivalent mandatory KDU signature mechanism
KKDIK dossier preparation, review or validation requires involvement of qualified Turkish experts where applicable
Certified Turkish expert resources and review timelines should be planned early
SDS
Prepared under EU CLP and relevant Member State language requirements
Turkish SDS, known locally as Güvenlik Bilgi Formu or GBF, is required for the Turkish market
EU SDS documents should not be used directly as Turkish market documents
Data sharing
Joint submission, LoA and data-sharing agreements are central mechanisms
SIEF, LoA and Turkey-specific data access arrangements are also central
EU data may be reused only where authorization covers KKDIK/Turkey use
KDU, or Kimyasal Değerlendirme Uzmanı, refers to a Turkish Chemical Assessment Specialist. In some English-language practice, this role is also referred to as CAS. Even where EU REACH data can be reused, a qualified Turkish expert may still need to review, validate, adapt or sign off relevant parts of the KKDIK submission.
Can EU REACH Data Be Reused for KKDIK?
In many cases, EU REACH data may support KKDIK registration. However, “reusable” does not mean “automatically acceptable.”
Because KKDIK refers closely to EU REACH technical concepts, existing EU REACH studies may support KKDIK registration. These may include physicochemical studies, toxicological studies, ecotoxicological studies, classification and labelling rationale, exposure assessment information and parts of the chemical safety assessment.
Before relying on EU REACH data for KKDIK, companies should assess at least the following questions:
Is the substance identity comparable?
The Turkish substance should be assessed against the EU REACH registered substance, including composition, impurity profile and test material representativeness.Does the data cover the relevant KKDIK tonnage band?
A data package sufficient for one tonnage band may not be sufficient for a higher tonnage band.Is the study quality acceptable?
Companies should review whether studies meet relevant quality expectations, such as GLP, OECD test guidelines or other accepted scientific standards.Does the Letter of Access allow use for KKDIK/Turkey?
Data purchased or accessed for EU REACH does not automatically grant the right to use that data for KKDIK.Will the KDU/CAS expert accept the data and adaptation logic?
Data gaps, read-across, waiving arguments and exposure-based justifications should be reviewed before submission.
Highly Reusable Data
Physicochemical, toxicological and ecotoxicological study reports
Key study summaries from EU REACH joint submissions
Existing classification and labelling rationale
Existing exposure assessment, risk management measures and use descriptions
Items That Must Be Reassessed
Substance identity, impurity profile and test material representativeness
Tonnage band, data gaps and adaptation arguments
Whether the LoA covers KKDIK/Turkey use
OR/importer coverage and actual Turkish market uses
Items Requiring Local Adaptation
Turkish-language study summaries and KKS data entry
CSR-related content, local uses and exposure scenario adaptation
Turkish SDS preparation and qualified expert review where required
SIEF communication and KDU/CAS review comments
For companies at an early planning stage, REACH24H's article on EU REACH registration scope and exemptions may also help clarify which substances and supply chain roles are typically subject to REACH-type registration obligations.
LoA and Data Access Strategy: The Key Bridge between EU REACH and KKDIK
Most EU REACH data is not freely controlled by every registrant . It may be owned or managed by a lead registrant, data owner or consortium. Under EU REACH, data sharing is an important mechanism intended to avoid unnecessary testing and enable cost sharing among registrants of the same substance. ECHA also provides guidance on data sharing and cost sharing under REACH .
For KKDIK purposes, companies should not only ask whether the data exists. They should confirm whether they have the legal right to use it for KKDIK or Turkey.
A practical LoA workflow usually includes:
Confirm the EU REACH registration status, joint submission and lead registrant or consortium contact.
Compare substance identity between the EU REACH registration and the Turkish substance to be registered.
Review the existing LoA or data-sharing agreement to determine whether KKDIK/Turkey use is covered.
If necessary, negotiate a KKDIK-specific LoA or Data Access Letter.
Confirm tonnage band, use scope, regulatory purpose, restrictions and confidentiality terms.
Retain contracts, invoices, authorization letters and communication records.
Conduct data gap analysis, translation, CAS review and KKS data entry.
For companies managing both EU REACH and KKDIK, LoA strategy should be integrated with the broader registration budget. REACH24H’s guide to EU REACH registration costs explains how administrative fees, data fees, testing fees and service fees may affect overall cost planning.
Cost Optimization: Where Savings May Come From
Data reuse may help companies reduce unnecessary repeat testing, but the cost-saving potential should be assessed case by case.
For a typical organic substance in the 100–1,000 t/a band, generating a complete new set of physicochemical, toxicological and ecotoxicological data may involve substantial cost. If suitable EU REACH data already exists and KKDIK-use authorization can be obtained, the repeated testing budget may be significantly reduced.
The following model is for budget planning only . It is not a fixed quotation, legal opinion or guaranteed outcome.
Physicochemical testing
Approx. EUR 15,000–30,000
Usually not repeated
Toxicology testing
Approx. EUR 150,000–250,000
Often reusable through authorization
Ecotoxicology testing
Approx. EUR 100,000–180,000
Often reusable through authorization
LoA / data access fee
Not applicable
Approx. EUR 20,000–45,000 or higher
KDU/CAS, translation and dossier adaptation
Approx. EUR 8,000–15,000
Approx. EUR 12,000–25,000
Estimated technical compliance cost
Approx. EUR 273,000–475,000
Approx. EUR 32,000–70,000
In suitable cases, EU REACH data reuse may reduce repeated testing budgets substantially. In the example above, the potential reduction in repeated testing costs may exceed 80%. However, actual costs depend on substance identity, tonnage band, data ownership, LoA pricing, data gaps, testing needs, Turkish translation workload, CAS comments and official fees.
Unsure whether LoA or additional testing is needed?
Contact REACH24HKKDIK 2026–2030 Timeline: Temporary Registration Is Not an Exemption
Temporary registration should be understood as a transitional compliance arrangement. It should not be interpreted as an exemption from KKDIK registration obligations or as a substitute for completing full registration by the applicable phased deadline.
The Ministry of Environment, Urbanization and Climate Change has stated through its General Directorate of Environmental Management that individual temporary registration dossier submissions should be made through KKS with a clearly stated justification. The same official communication refers to 30 September 2026 as the deadline for individual temporary registration submissions.
Companies that cannot complete full registration or a joint temporary registration in time should assess whether an individual temporary registration pathway is applicable. The appropriate route should be determined based on SIEF progress, lead registrant status, LoA negotiation, tonnage band, hazard classification and supply chain arrangements.
Individual temporary registration submissions through KKS, where this route is selected or applicable
Confirm full registration and joint registration status; assess whether individual temporary registration is needed to manage market continuity risk
Substances manufactured or imported at ≥1,000 t/a; or substances at ≥100 t/a classified as Aquatic Acute 1 and/or Aquatic Chronic 1, H400/H410; or substances at ≥1 t/a classified as CMR Category 1A or 1B
Complete full registration strategy, data access and dossier preparation for high-tonnage or high-hazard substances
Substances manufactured or imported at ≥100 t/a, without prejudice to the earlier deadline where applicable
Complete Annex IX-related data planning, LoA, CSR-related work and Turkish localization
Other substances manufactured or imported at ≥1 t/a, without prejudice to earlier deadlines where applicable
Plan medium- and low-tonnage substance registrations in batches to avoid late-stage bottlenecks
REACH24H has also published a dedicated update on KKDIK temporary registration and the 2026 compliance milestone.
Four Checks Companies Should Start Now
1. Screen substance inventory and tonnage
Identify substances on their own, substances in mixtures and substances intended to be released from articles. Review historical and forecasted export volumes to Turkey, including volumes covered by different importers or customers.
2. Review the EU REACH data foundation
Confirm whether the substance has already been registered under EU REACH, whether it is part of a joint submission and whether the lead registrant, data owner or consortium can be contacted.
3. Assess data gaps and LoA scope
Determine whether existing data covers the relevant KKDIK tonnage band and whether the LoA or data access agreement explicitly allows use for KKDIK or Turkey. Identify whether additional testing, read-across, waiving or expert justification may be needed.
4. Decide the Turkish submission route
Depending on importer structure, OR strategy, SIEF progress, customer coverage and timing, companies may need to evaluate full registration, joint temporary registration or individual temporary registration. Temporary registration should be treated as a transitional route, not as the final completion of KKDIK obligations.
Only Representative Strategy for Non-Turkish Manufacturers
For manufacturers outside Turkey, KKDIK compliance can generally be managed through Turkish importers or through a Turkish Only Representative.
Relying on importers may appear simpler at the beginning, but it may require disclosure of substance, use, tonnage and technical information to multiple Turkish customers. It may also create dependency on specific importers. If a manufacturer changes customers or expands distribution, the previous registration arrangement may not automatically cover the new supply chain.
Appointing a Turkish Only Representative may help centralize registration obligations, support multiple import channels within the registered scope and protect confidential business information. However, OR coverage is not unlimited. Companies still need to maintain alignment between registered tonnage, uses, customer lists, supply chain roles and Turkish SDS information.
REACH24H's KKDIK Turkey REACH service page provides further details on KKDIK registration support, Turkish OR strategy and related compliance services.
“One Test, Multiple Markets”: Building a Global Data Strategy
For companies planning to enter the EU, Turkey, China, Korea or other chemical markets, testing should not be designed for one jurisdiction in isolation.
A stronger strategy is to identify target markets before testing begins and then align test methods, GLP requirements, test material representativeness, data ownership and future authorization rights. This can improve the likelihood that one data package can support multiple regulatory submissions.
However, “global data reuse” does not mean that one report will be accepted everywhere without review. Different jurisdictions may have different expectations for test material, report format, expert review, authority communication, language and data authorization.
The value of a global data strategy is to improve data reusability and negotiation leverage, not to remove local compliance requirements.
How REACH24H Can Support KKDIK and EU REACH Compliance
REACH24H supports global chemical companies with both KKDIK Turkey REACH registration and EU REACH registration . For companies managing both regulatory systems, our team can help align data strategy, registration scope, local representation and post-registration maintenance.
Substance inventory screening, tonnage review and regulatory applicability analysis
Review of existing EU REACH data, study quality, tonnage coverage and data gaps
Support for data owner communication, LoA scope review and negotiation planning
Evaluation of full registration, joint temporary registration or individual temporary registration where applicable
Support for LR/member role analysis, SIEF communication and registration planning
OR strategy and supply chain coverage assessment for non-Turkish manufacturers
Coordination with qualified Turkish experts for dossier review, validation and submission
Turkish-language dossier adaptation, KKS data entry and submission support
Turkish SDS/GBF preparation, review and expert validation support
Only Representative support, dossier preparation, LoA review, data gap analysis and post-registration maintenance
Tonnage tracking, use changes, customer coverage updates and regulatory monitoring
Planning KKDIK and EU REACH compliance in parallel?
Contact REACH24HFAQ
Yes, it can often serve as an important basis. However, it cannot be used automatically. Companies need to confirm substance identity, tonnage coverage, study quality, LoA scope and CAS acceptance.
No. EU REACH and KKDIK are separate legal systems. An EU REACH registration number does not replace a KKDIK registration number or other applicable Turkish registration arrangement.
Not necessarily. A Letter of Access or data-sharing agreement should be reviewed to confirm whether KKDIK or Turkey use is included. If not, a separate data access negotiation may be required.
Polymers are generally exempt from KKDIK registration. However, monomers or other reactants used to manufacture the polymer may still trigger registration obligations when relevant conditions are met. Each case should be assessed based on substance identity, role and tonnage.
This is not recommended. Turkish SDS, known locally as GBF, should meet Turkish regulatory and language requirements and should be professionally prepared, reviewed or validated by qualified experts where required.
The company may face market access, import, customer procurement or regulatory inspection risks for relevant substances, depending on the substance, supply chain role and enforcement practice. Companies should confirm whether full registration can be completed or whether a temporary registration route is needed.
As early as possible. LoA negotiation, data gap review, Turkish translation, CAS review and KKS preparation can take time, especially where multiple substances, importers or data owners are involved.
Final Thoughts
For companies that already hold EU REACH registrations, KKDIK compliance should be managed as a Turkey market access project rather than a technical copy of an EU dossier.
The priority is to determine which EU REACH data can be reused, which data requires additional authorization, where gaps remain, who can legally grant data access and which party will take responsibility in Turkey.
Early planning can help companies reduce unnecessary repeat testing, control LoA and localization costs, and avoid supply chain uncertainty ahead of the 2026 compliance milestones.
Need to assess KKDIK data reuse or compare your EU REACH and Turkey REACH obligations?
Contact REACH24HReferences and Further Reading
REACH24H: KKDIK Turkey REACH Registration Services
REACH24H: EU REACH Registration Guide
REACH24H: EU REACH Registration Costs
REACH24H: EU REACH Registration Scope and Exemptions
REACH24H: KKDIK Temporary Registration Activated
EUR-Lex: Regulation (EC) No 1907/2006 concerning REACH
ECHA: Work Together to Share Data and Its Costs
MoEUCC/CYGM: KKDIK Regulation Amendment Announcement
MoEUCC/CYGM: Chemicals Consultation Group Meeting Announcement, 3 March 2026
