On 19 October 2026, the UK Health and Safety Executive (HSE) formally added nine substances and substance groups to the UK REACH Candidate List of Substances of Very High Concern (SVHCs). This is not a consultation or a proposal. The additions are confirmed, and the core UK REACH SVHC obligations for Great Britain article suppliers apply from that date. If your products reach the GB market, your communication duty is already live, and a notification window to HSE has already started counting down.

This guide focuses on what you owe now, not on re-listing substance chemistry. For the consultation background and substance profiles, see our earlier analysis of the UK REACH SVHC consultation and Candidate List additions. Here, the priority is the obligations, the two separate deadlines, and the supplier data work that both now require.

Before you brief your team, a compliance risk assessment can map which of your GB-bound articles may contain the newly listed substances.

Key Takeaways

• HSE added nine SVHCs/groups to the UK REACH Candidate List on 19 October 2026, the second UK update of the year after 15 additions in June.

• The UK REACH Article 33 communication duty for articles containing a listed SVHC above 0.1% w/w applies immediately, regardless of tonnage.

• The Article 7(2) notification to HSE applies where articles exceed 0.1% w/w and total more than one tonne per year, generally due within six months of listing (by 19 April 2027).

• Each listed substance spans real supply chains: flame retardants, UV stabilisers, plasticisers, a PFAS group, and a bisphenol.

• The nine are a subset of the EU Candidate List, so GB and EU/Northern Ireland duties can diverge for the same article.

• Both duties are, at root, a data problem: knowing substance presence at the BOM level and collecting current supplier evidence at scale.

What Changed on the UK REACH Candidate List

The UK REACH Candidate List is the register of substances formally identified as SVHCs under Article 59 of UK REACH. Inclusion does not ban a substance, but it triggers immediate legal duties for suppliers of the substance, mixtures, and articles placed on the GB market. HSE acts as the UK REACH Agency and publishes the list for Great Britain, as set out in its UK REACH SVHC guidance.

The 19 October 2026 update is the second of the year. HSE added 15 entries in June and has signalled further consultations across the 2026 to 2027 work year. All nine new entries also appear on the EU REACH Candidate List, but this remains a deliberate subset rather than automatic alignment. For context on how SVHC duties cascade across the wider framework, our REACH compliance overview explains the Candidate List, authorisation, and restriction stages together.

The Nine Substances Now Listed

The table below is a reference, not the point of the article. Two entries are likely to reach the widest range of GB businesses: medium-chain chlorinated paraffins, used as flame retardants and secondary plasticisers, and the PFAS group PFHpA.

Because this batch includes a PFAS and a bisphenol, expect OEM and customer questions to arrive from both chemical risk programmes. Teams already running PFAS tracking across the supply chain should fold PFHpA into the same workflow rather than treating it as a separate exercise.

The Obligations That Are Already Live

Inclusion on the Candidate List creates distinct duties with different triggers and different timing. Treating them as one is the most common way GB suppliers fall behind. The two that matter most for article suppliers are the Article 33 communication duty and the Article 7(2) notification duty.

UK REACH SVHC obligations split into Article 33 communication and HSE notification duties

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Duty to Communicate Information on Articles (Article 33)

If you supply an article containing one of the newly listed SVHCs above 0.1% weight by weight, you must give the recipient enough information to allow safe use, as a minimum the name of the substance. This duty is independent of tonnage and applies from the date of listing, so it is live now. Consumers who request the information must receive it within 45 days. HSE confirms this applies per component article in a complex product such as a vehicle or an appliance, following the same reasoning as the HSE substances-in-articles guidance.

The 0.1% threshold applied at component level is where many BOMs quietly breach. A flame retardant or UV stabiliser can sit above 0.1% in a single connector, housing, or coating even when it is well under 0.1% of the finished product. Reliable answers depend on BOM-level substance and threshold tracking rather than product-level estimates.

Notification to HSE (Article 7(2))

Producers and importers of articles must notify HSE where a Candidate List substance is present above 0.1% w/w in those articles and the total quantity exceeds one tonne per producer or importer per year. Exemptions can apply, including where exposure is excluded under normal and reasonably foreseeable conditions, or where the substance is already registered for that use. The notification generally must be made within six months of inclusion, which places the practical deadline for this batch at 19 April 2027.

That six-month window is not slack time. Establishing whether you cross the one-tonne threshold requires summing substance quantities across every affected article, which in turn depends on current, verified supplier declarations. For most manufacturers, assembling that evidence is the real constraint, not filing the notification itself.

Substances and Mixtures

Suppliers of a listed substance on its own, or in a mixture at or above 0.1% w/w for non-gaseous mixtures, must provide or update safety data sheets so downstream users receive accurate hazard and safe-use information. The table below summarises who owes what.

Who Is Affected

The uses behind these substances are broad, so the exposure is not confined to one sector. Flame retardants and UV stabilisers reach far into durable goods, and a PFAS entry widens the net further.

• Electronics and electrical equipment: BTBPE and BCPS appear in polymers, housings, and components. These programmes already run deep SVHC screening, and electronics supply chains now need to add the new entries to existing watch lists.

• Automotive and industrial manufacturing: MCCPs in lubricants, greases, PVC, and cables, plus phosphorothioate lubricant additives, put automotive suppliers squarely in scope across both parts and fluids.

• Coatings, paints, sealants, and adhesives: Bumetrizole as a UV stabiliser is common across these formulations.

• Consumer and mixed product lines: PFHpA and Bisphenol AF connect this update to existing PFAS and bisphenol stewardship work rather than creating an isolated task.

The GB Versus EU Divergence Trap

Because the nine are a subset of the EU Candidate List, the same article can carry different duties in different markets. For GB, UK REACH Article 33 and Article 7 apply. For the EU and Northern Ireland, EU REACH Article 33 and the separate SCIP database notification to ECHA may also apply for articles placed on that market. Managing one list manually is difficult. Managing two lists that overlap but do not match is where spreadsheet-based tracking breaks down, which is why materials and environmental compliance teams increasingly centralise both.

What GB Article Suppliers Should Do Now

A practical sequence for the next two quarters, ending before the Article 7 window closes:

1. Confirm presence at BOM level. Screen the nine substances against your bill of materials by CAS number and component, not by finished-product averages.

2. Apply the 0.1% test per component. Identify every article where a listed SVHC sits above 0.1% w/w, because that alone triggers the Article 33 duty.

3. Sum tonnage for notification. Where a substance exceeds 0.1% w/w, aggregate annual quantity across articles to test the one-tonne Article 7 trigger.

4. Issue or update Article 33 communications. Provide safe-use information to business customers now, and prepare for 45-day consumer requests.

5. Refresh supplier declarations. Collect current, dated statements from suppliers rather than relying on prior-year documents that predate the listing.

6. Check EU/NI exposure. For articles on those markets, assess EU REACH Article 33 and SCIP duties in parallel.

7. Record the evidence. Keep time-stamped declarations and decisions so the file is audit-ready across frameworks for customer audits and HSE queries.

Struggling to confirm which parts contain the new SVHCs? A compliance review can pressure-test your BOM screening and supplier evidence before the April 2027 notification window.

Where This Becomes a Data Problem

Every obligation above reduces to two questions: is a listed substance present above threshold in a specific article, and can you prove it with current supplier evidence. SVHC lists now change more than once a year, so a one-off screen is no longer enough. The shift is from periodic checks toward continuous compliance monitoring and horizon scanning, so a new Candidate List entry is matched against your parts the day it lands, not at the next audit.

UK REACH SVHC obligations screening workflow from Candidate List to notification

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This is where Certivo operates as the system of record. Certivo maintains BOM-level material and substance data, runs automated supplier data collection through supplier portals, and uses AI document parsing to validate certificates and declarations at intake instead of during an audit. CORA-powered regulatory intelligence tracks Candidate List changes across UK REACH and EU REACH, so updates like this one map to affected parts automatically and leave a time-stamped, audit-ready record.

The objective is not to eliminate compliance risk, which no software can claim. It is to reduce surprises, shorten the time to retrieve evidence, and replace manual list-matching across multi-tier suppliers with automated supplier data collection. For SVHC work specifically, that is the difference between meeting the April 2027 notification window with confidence and discovering a gap during a customer audit.

The Bottom Line for GB Market Access

The nine additions of 19 October 2026 move your UK REACH SVHC obligations from theory to live duties. The Article 33 communication duty is already in force. The HSE notification window is open and closes in April 2027. Both depend on substance-level visibility into your products and current evidence from your suppliers, and both now apply against a Candidate List that will keep growing. Manufacturers that treat SVHC screening as a continuous, data-backed process rather than an annual scramble will carry far less GB market-access risk as the list expands.

Book a compliance risk assessment to screen your GB-bound articles against the nine new SVHCs, confirm your Article 33 and notification exposure, and put audit-ready evidence in place before the deadline.