The four major chemical regulatory frameworks — EU REACH, US TSCA, UK REACH, and Korea's K-REACH — share the same broad objective (ensuring that chemicals placed on the market are safe for human health and the environment) but differ substantially in their approach, scope, and enforcement mechanisms. REACH operates on a no data, no market principle with mandatory pre-market registration. TSCA takes a risk-based post-market approach where the EPA must demonstrate unreasonable risk before restricting a substance. UK REACH mirrors REACH in structure but has diverged in implementation since Brexit. K-REACH follows REACH most closely among Asian frameworks but with Korean-specific substance lists and communication requirements.
Understanding where these frameworks converge and diverge is essential for any business manufacturing or importing chemical substances across multiple markets. The table below sets out the core obligations side by side.
Core Regulatory Comparison
| Requirement | EU REACH | US TSCA | UK REACH | K-REACH (Korea) |
|---|---|---|---|---|
| Primary legislation | Regulation (EC) No 1907/2006 (REACH); Regulation (EC) No 1272/2008 (CLP) for classification and labelling | Toxic Substances Control Act (TSCA), 15 U.S.C. §2601 et seq. (amended by the Frank R. Lautenberg Chemical Safety for the 21st Century Act, 2016) | UK REACH (retained in UK law via the Environment Act 2021 and REACH etc. (Amendment etc.) (EU Exit) Regulations 2019); HSE and DEFRA as joint authorities | Act on Registration and Evaluation of Chemical Substances (K-REACH, Law No. 11789); Chemical Substances Control Act (CSCA) |
| Registration trigger | Manufacture or import of a substance at ≥1 tonne/year; no data, no market — registration dossier required before placing substance on market | New chemical substances require pre-manufacture notice (PMN) to EPA at least 90 days before first manufacture or import; existing inventory substances generally no registration required | Manufacture or import of a substance into Great Britain at ≥1 tonne/year; full registration dossier required by phased deadlines (2026, 2028, 2030); transitional registrations (TRs) and downstream user import notifications (DUINs) expiring | Manufacture or import of a substance at ≥0.1 tonne/year triggers registration; substances ≥1 tonne/year require full registration dossier with hazard data; phased deadlines by tonnage and hazard profile |
| Hazardous substance controls | SVHC Candidate List (251+ substances); Authorisation List (substances of very high concern requiring specific authorisation per use); Restriction List (Annex XVII) — specific use/market prohibitions | Section 6 risk management rules (unreasonable risk standard); significant new use rules (SNURs) requiring notification before new use; Section 4 testing orders; no equivalent to SVHC notification obligation | UK SVHC Candidate List (maintained independently from EU — diverging since 2021); UK Authorisation List; UK Restriction List; all require separate monitoring from EU equivalents | Toxic Chemical Substance (TCS) list with mandatory risk assessment; Restricted Chemical Substances list prohibiting or limiting specific uses; no direct equivalent to SVHC concept but designated hazardous substance lists function similarly |
| SDS obligations | CLP-compliant SDS required for hazardous substances and mixtures; extended SDS for non-hazardous substances/mixtures containing SVHCs >0.1%; 16-section format per REACH Annex II | OSHA Hazard Communication Standard (29 CFR 1910.1200) — GHS-aligned SDS required for all hazardous chemicals; 16-section format; SDS must be available to downstream workers | UK CLP-compliant SDS required; GB format requirements diverging from EU format; UK-specific emergency contact requirements and UK responsible person contact details | GHS SDS in Korean format (9th Revised UN GHS); mandatory from 1 July 2026 — old MSDS format no longer accepted; electronic SDS transmission to downstream users mandatory under 2025 amendments |
| Supply chain communication | SVHC notification to customers required within 45 days of request if substance present at >0.1% in article; SCIP database notification required for articles containing SVHCs; SDS must accompany all hazardous substance/mixture sales | No equivalent to SVHC notification obligation; TSCA Section 8(e) reporting of substantial risk information to EPA; PFAS Section 8(a)(7) reporting covers 2011–2022 historical data (window: Apr–Oct 2026) | UK equivalent of SVHC article notification (0.1% threshold applies); UK SCIP equivalent requirements in development; SDS obligations mirror EU with UK-specific contact details | SDS must be provided with all chemical product sales; mandatory substance disclosure to downstream users; K-REACH 2025 amendments require electronic SDS transmission; chemical product notification required |
| Import obligations | Non-EU manufacturers must appoint an EU Only Representative (OR) to hold the REACH registration — the OR is treated as the importer for REACH purposes; OR must be established in the EU | Non-US manufacturers must designate a US agent for PMN purposes; no general OR requirement for existing substances; article importers responsible for TSCA certification at import | Non-GB manufacturers must appoint a UK Only Representative; EU OR cannot fulfil UK REACH obligations; separate UK OR required; OR must be established in Great Britain | Non-Korean manufacturers must appoint a Korean domestic representative; representative responsible for K-REACH registration and downstream notification obligations; representative must be legally established in Korea |
| Enforcement penalties | Import bans for non-registered substances; Authorisation and Restriction violations enforced at member state level with penalties varying by jurisdiction; ECHA can propose corrective measures | Up to $48,500 per day per violation for TSCA violations (civil penalty); criminal penalties available for knowing violations; import alerts and customs detention for non-compliant imports | HSE enforcement action including improvement notices, prohibition notices, and prosecution; penalties under UK law; import bans enforced by Border Force for non-registered substances | Administrative fines and criminal penalties under CSCA and K-REACH; import stops for non-registered substances; SDS violations subject to penalties from 1 July 2026 under 2025 amendments |
| Key 2025–2026 change | REACH 2.0 revision proposal published April 2025; RSB negative opinion Sep 2025 — adoption expected 2026+; PFAS universal restriction (Annex XVII) decision expected 2026–2027; SVHC list passing 251 substances | TSCA PFAS reporting window opens Apr 13 2026 (most manufacturers); TSCA TCE risk management rule effective 18 May 2026; expanded import enforcement programme from Dec 2025 | Phase 1 transitional registration deadline 2026 for high-volume and hazardous substances; UK SVHC list diverging progressively from EU; UK REACH registrations require independent dossiers from EU REACH | GHS SDS format mandatory from 1 July 2026 — old MSDS invalid; K-REACH 2025 structural amendments in effect including electronic SDS transmission; expanded NICS pre-registration consultation requirements |
Key Differences in Regulatory Philosophy
The most fundamental difference between REACH and TSCA is who bears the burden of proof. Under REACH, the registrant must demonstrate that a substance can be used safely — the European Commission and ECHA do not need to prove harm to restrict a substance. Under TSCA as amended in 2016, the EPA must conduct a formal risk evaluation and make an "unreasonable risk" finding before it can regulate a substance under Section 6. This makes the US pathway to restriction significantly more procedurally demanding — and considerably slower — than the REACH pathway, as the TCE process demonstrates.
UK REACH mirrors REACH in structure but creates an additional operational burden for businesses active in both the EU and GB markets: the registration dossier, the Only Representative, the SVHC Candidate List, and the Restriction List must all be managed separately in each jurisdiction. A substance may be on the EU SVHC Candidate List but not yet on the UK list (or vice versa), creating different downstream notification obligations depending on whether the customer is in the EU or GB.
K-REACH follows REACH most closely in its registration trigger and SDS communication model, but the Korean GHS SDS format requirements, designated substance lists, and representative obligations are distinct from EU REACH equivalents. Businesses attempting to use EU-format SDS for Korea, or EU-registered substances without separate K-REACH registration, consistently encounter compliance failures.
Registration: Where the Frameworks Diverge Most Significantly
REACH registration is continuous — dossiers must be updated when significant changes to the substance or its uses occur, and ECHA can request additional data at any point through the substance evaluation process. TSCA PMN review is a one-time pre-manufacture notification for new substances, after which the substance is added to the TSCA Inventory and subsequent manufacturers have no individual notification obligation. UK REACH requires independent dossiers even for substances already registered under EU REACH, creating duplicative data package preparation for businesses active in both markets.
K-REACH registration timelines and tonnage triggers are broadly similar to REACH, but the Korean domestic representative requirement means that each substance registration must be tied to a specific Korean legal entity — a common source of compliance gaps when a Korean representative relationship ends and the manufacturer does not promptly appoint a replacement.
PFAS: The Cross-Framework Issue
PFAS create compliance obligations in all four frameworks simultaneously. EU REACH SVHC notifications apply to individual PFAS substances already on the Candidate List; the universal PFAS Annex XVII restriction proposal covers approximately 10,000 PFAS substances. TSCA Section 8(a)(7) requires historical PFAS reporting covering 2011–2022 with a 2026 reporting window. UK REACH requires separate SVHC monitoring for the UK list. K-REACH includes PFAS-related substances on its designated substance lists, with specific registration and use reporting obligations. Businesses with PFAS in their products or supply chains need a framework-specific PFAS assessment for each jurisdiction — a single EU PFAS assessment does not satisfy US, UK, or Korean obligations.
Planning for Multi-Market Chemical Compliance
Businesses manufacturing or importing chemical substances across all four markets face the most complex compliance coordination challenge in the chemical sector. EU REACH registration dossiers and UK REACH registration dossiers must be maintained separately — the data packages may be substantially similar, but the legal entities, registration numbers, and communication obligations are entirely independent. TSCA PMN and REACH registration may be running simultaneously for the same new substance. K-REACH registration requires a Korean domestic representative distinct from any EU or UK OR arrangement.
The 2026 calendar adds an unusual level of acute pressure: TSCA PFAS reporting, UK REACH Phase 1 registration deadlines, and K-REACH SDS format compliance all fall within the same twelve-month window. Businesses that treat each of these as an isolated project risk duplicating effort and missing interactions between them — particularly where the same substance inventory data feeds into multiple reporting and registration obligations across frameworks.
Operating across multiple chemical regulatory frameworks?
TGC's chemical compliance team provides multi-market assessments covering REACH, TSCA, UK REACH, and K-REACH obligations — with a prioritised action plan identifying what needs to happen, in which jurisdiction, and by when.
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