chemistry

Substance of very high concern

Substance of very high concern is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Substance of very high concern rather than just read about it. In short: A substance of very high concern (SVHC) is a chemical substance (or part of a group of chemical substances) which has been proposed as a candidate for inclusion on the Authorization or Restriction list (see: ECHA Lists) of REACH. The addition of a substance to the SVHC Candidate List by the European Chemicals Agency (ECHA) is the first step in the procedure for the authorisation or restriction of a chemical.

Key takeaways

Substance of very high concern belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Substance of very high concern to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Substance of very high concern from memory before moving on to harder problems.

Reference excerpt

A substance of very high concern (SVHC) is a chemical substance (or part of a group of chemical substances) which has been proposed as a candidate for inclusion on the Authorization or Restriction list (see: ECHA Lists) of REACH. The addition of a substance to the SVHC Candidate List by the European Chemicals Agency (ECHA) is the first step in the procedure for the authorisation or restriction of a chemical. It is expected that industries operating in EU member states abide by the regulations of REACH and submit chemicals for consideration when appropriate. The first list of SVHCs was published on 28 October 2008 with the list being updated biannually since then. The most recent update occurred in June 2025, bringing the size to 250 SVHCs.

Criteria The criteria are given in article 57 of the REACH Regulation. A substance may be proposed as an SVHC if it meets one or more of the following criteria:

it is carcinogenic; it is mutagenic; it is toxic for reproduction; it is persistent, bioaccumulative and toxic (PBT substances); it is very persistent and very bioaccumulative (vPvB substances); there is "scientific evidence of probable serious effects to human health or the environment which give rise to an equivalent level of concern"; such substances are identified on a case-by-case basis. The "equivalent concern" criterion is significant because it is this classification which allows substances which are, for example, neurotoxic, endocrine-disrupting or otherwise present an unanticipated environmental health risk to be regulated under REACH. Simply because a substance meets one or more of the criteria does not necessarily mean that it will be proposed as an SVHC. Many such substances are already subject to restrictions on their use within the European Union, such as those in Annex XVII of the REACH Regulation. SVHCs are substances for which the current restrictions on use (where these exist) might be insufficient. There are three priority groups for assessment:

PBT substances and vPvB substances; substances which are widely dispersed during use; substances which are used in large quantities.

Procedure for listing Proposals for inclusion of a substance on the list of SVHCs can come either from the European Commission or one of the Member States of the European Union. The proposals are made public by the European Chemicals Agency (ECHA) and are open for public comment for 60–90 days. If the substance is deemed to meet one or more of the criteria, it is then listed as an SVHC. Once a substance has been listed as an SVHC, the Agency commissions a technical report from one or more national or private laboratories, which analyses the available information on manufacture, imports, uses and releases of the substance, as well as possible alternatives. On the basis of this technical report, the Agency decides whether to prioritise the substance, in effect, whether to make a recommendation to the European Commission to add the substance to Annex XIV of the REACH Regulation, making its use subject to authorisation. The draft recommendations must be made public and opened for comment for three months before the final recommendations are sent to the commission. The first draft recommendations were published on 14 January 2009, and new draft recommendations must be issued at least once every two years.

Consequences of listing The list of SVHCs is primarily a public list of substances for which the European Chemicals Agency is considering imposing a requirement for authorisation for some or all uses. However, there are some direct consequences of including a substance on the list of SVHCs. Suppliers of pure SVHCs must provide their customers with a safety data sheet (SDS). Suppliers of mixtures of substances which contain more than 0.1% by weight of any SVHC must provide their customers with a safety data sheet on request. Manufacturers or importers of articles containing more than 0.1% by weight of any SVHC must provide their customers, and consumers on request, with adequate information on the safe use and disposal of the article, including the name of the SVHC(s) concerned. From 1 June 2011, manufacturers and importers of articles also have to notify the European Chemicals Agency of the quantities of SVHCs used in their articles. In addition to the obviously involved chemical industry, there are many more industries affected by this regulation: drapery and leather industry, plastic processing, cosmetic industry, food industry, petroleum processing, printing industry, sports equipment industry, toys industry, recycling industry, electrical engineering industry, fine mechanics industry, optics industry, engine and plant production industry.

Candidate list of substances of very high concern This list is referred to as the "candidate" list because all substances placed on it are candidates for inclusion in Annex XIV of REACH. If a substance is added to Annex XIV, it is given a "latest application date" and a "sunset date". The sunset date is the date after which the substance cannot be used or imported into the EU without authorisation from the ECHA, and the latest application date is the date by which any applications for use must be submitted to the ECHA. This table includes the Candidate list updates as of January 2024; find the complete list in references.

Notes The CAS numbers for groups of compounds such as "SCCP" are indicative. Such groups can include several compounds, each of which has a different CAS number. PBT = persistent, bioaccumulative and toxic vPvB = very persistent and very bioaccumulative

References

External links Candidate list of substances from ECHA Authorisation List (Substances included in Annex XIV of REACH) from ECHA Obligations Linked to the Candidate List of Substances of Very High Concern from ECHA Definition of SVHC as in Article 57 of Regulation (EC) No 1907/2006 ("the REACH Regulation")

Worked examples

Example 1 — a first encounter with Substance of very high concern

Start with the simplest possible case. Write down what Substance of very high concern claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Substance of very high concern before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Substance of very high concern ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Substance of very high concern

In research: Substance of very high concern appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Substance of very high concern in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Substance of very high concern is common in secondary-school and first-year university syllabi. It links to neighbouring topics Hazardous materials, Regulation of chemicals in the European Union, Toxicology, so understanding it makes those chapters shorter.
In everyday life: Look for Substance of very high concern outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Substance of very high concern in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Substance of very high concern means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Substance of very high concern out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Substance of very high concern in simple terms?

Why does Substance of very high concern matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Substance of very high concern?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Substance of very high concern.