If you sell candle fragrances, reed diffuser bases, cleaning concentrates, adhesives or any other chemical mixture in the EU, sooner or later a customer or distributor will ask for one document above all others: the safety data sheet. An SDS is the standardised file that tells professional users how to handle, store, transport and dispose of a hazardous product safely — and supplying it is a legal duty, not a courtesy.
This guide explains what a safety data sheet is, the 16 sections it must contain, exactly when EU law requires one (and when it does not), and how the SDS connects to the wider CLP, UFI and Poison Centre Notification picture. It is aimed at makers and importers who keep being asked for an SDS and want to understand the obligation properly.
Key takeaways
- A safety data sheet (SDS) is a standardised 16-section document, required under REACH (Regulation (EC) No 1907/2006), that communicates the hazards and safe handling of a substance or mixture.
- An SDS is mandatory when a substance or mixture is classified as hazardous under CLP, and in certain other cases such as PBT/vPvB substances or mixtures containing hazardous ingredients above set limits.
- Most finished cosmetic products do not require an SDS — they are regulated under the Cosmetic Regulation — but the raw materials and many cosmetics-adjacent products (room sprays, candle fragrances, cleaning products) do.
- The SDS must be supplied free of charge, in the official language of the member state, by the time the product is first supplied to a professional user.
- The hazard information in the SDS must match your CLP classification exactly — the two documents share the same foundation.
What is a safety data sheet?
A safety data sheet is the primary tool for passing hazard and safe-handling information down the supply chain. When a professional buyer receives a chemical product, the SDS tells them what the hazards are, what protective equipment to use, what to do in a spill or fire, and how to store and dispose of it. The format is not optional or free-form: it follows a strict 16-section structure defined in REACH (Annex II), so that a buyer in any member state can find the same information in the same place.
The SDS exists to protect workers and the environment. It is aimed at professional and industrial users rather than ordinary consumers — a member of the public buying a finished consumer product generally relies on the label, while the businesses handling chemicals in bulk rely on the SDS.
The 16 sections of an SDS
Every compliant SDS follows the same running order. Knowing the structure helps you spot a deficient sheet at a glance.
| Section | Covers |
|---|---|
| 1–3 | Identification, hazard identification, and composition / ingredient information |
| 4–6 | First-aid measures, fire-fighting measures, and accidental release measures |
| 7–8 | Handling and storage, and exposure controls / personal protection |
| 9–11 | Physical and chemical properties, stability and reactivity, and toxicological information |
| 12–14 | Ecological information, disposal considerations, and transport information |
| 15–16 | Regulatory information, and other information (including revision details) |
Sections 2 and 3 are where the SDS and your CLP classification have to agree: the hazards declared here must mirror the classification behind your CLP label. If the SDS says one thing and the label another, you have a compliance gap.
When is an SDS legally required?
Under REACH, a supplier must provide a safety data sheet in the following main situations:
- The substance or mixture is classified as hazardous under the CLP Regulation.
- The substance is persistent, bioaccumulative and toxic (PBT) or very persistent and very bioaccumulative (vPvB).
- The substance is on the candidate list of substances of very high concern.
- A mixture is not classified as hazardous overall but contains certain hazardous substances above defined concentration limits — in which case a professional recipient is entitled to an SDS on request.
The SDS must be supplied free of charge, on paper or electronically, in an official language of each member state where the product is placed on the market, and it must reach the recipient no later than the first delivery.
An SDS is generated from your product’s classification, not invented for it. Before you can write a correct SDS you must classify the substance or mixture under CLP — the classification drives the hazard statements, pictograms and handling advice the sheet contains.
Do cosmetics need a safety data sheet?
This is the most common point of confusion. Finished cosmetic products placed on the market in their final form generally do not require an SDS, because they are regulated under the dedicated EU Cosmetic Regulation (EC) No 1223/2009, which has its own safety and labelling regime (the CPSR, the PIF and the cosmetic label).
However — and this trips up a lot of makers — the raw materials and component chemicals used to make cosmetics are in scope, and many cosmetics-adjacent products are not legally cosmetics at all. Candle and diffuser fragrance oils, room sprays, reed diffuser bases and certain cleaning or novelty items frequently fall under CLP and REACH, and therefore need an SDS. If you are unsure which framework governs a borderline product, that classification question has to be settled first, because it decides whether you owe an SDS or a CPSR.
“It’s a cosmetic, so I don’t need an SDS” is only safe once you have confirmed the product really is a finished cosmetic. A room spray, a wax melt or a fragrance oil sold on its own is usually not a cosmetic and can require a fully compliant SDS — supplying one late, or not at all, is a common enforcement finding.
How the SDS connects to CLP, UFI and PCN
The SDS does not work in isolation. It sits at the centre of a connected chemical-compliance chain, all built on the same classification:
- CLP: your classification under the CLP Regulation determines the hazards that appear on both the label and the SDS — they must be consistent.
- UFI: the 16-character Unique Formula Identifier is generated for hazardous mixtures and printed on the label.
- PCN: before a hazardous mixture is sold, its composition and the UFI are notified via Poison Centre Notification so emergency responders can act in an exposure incident.
Change a formulation and the effect cascades: you may need to reclassify under CLP, revise the SDS, regenerate the UFI and re-notify via PCN. Preparing these together keeps them aligned far more reliably than patching one document at a time.
Bringing it all together
A safety data sheet is the 16-section file that carries hazard and safe-handling information to professional users, required under REACH whenever a substance or mixture is classified as hazardous (and in several related cases). Most finished cosmetics escape the requirement, but raw materials and cosmetics-adjacent products — fragrances, diffusers, cleaning and novelty goods — frequently need one. The golden rule is that the SDS must match your CLP classification line for line.
If you need a compliant SDS prepared from your formulation and classification, Lexora’s SDS preparation service produces a fully structured 16-section document that matches your CLP label, and our CLP Compliance Suite handles the whole chain — classification, labelling, SDS and notification — as one piece of work.
Frequently asked questions
What is a safety data sheet?
A safety data sheet (SDS) is a standardised 16-section document, required under the REACH Regulation, that communicates the hazards of a substance or mixture and how to handle, store, transport and dispose of it safely. It is aimed at professional users and follows a fixed structure so the same information appears in the same place on every sheet.
When is an SDS legally required?
An SDS is required when a substance or mixture is classified as hazardous under CLP, when a substance is PBT/vPvB or on the candidate list of substances of very high concern, and — on request — when a non-hazardous mixture contains certain hazardous ingredients above defined limits. It must be supplied free of charge, in the official language of each member state, by the time of first delivery.
Do finished cosmetic products need a safety data sheet?
Generally no. Finished cosmetics are regulated under the EU Cosmetic Regulation (EC) No 1223/2009, which uses the CPSR and the cosmetic label rather than an SDS. However, the raw materials used to make cosmetics, and many cosmetics-adjacent products such as room sprays and fragrance oils, do fall under CLP and REACH and require an SDS.
How does the SDS relate to the CLP label?
They share the same foundation. Your CLP classification determines the hazard information shown on both the label and the SDS, so the two must be consistent. If the SDS and the label disagree about a product’s hazards, that is a compliance gap that needs to be corrected.
Can I reuse my supplier’s SDS for my own product?
Not directly. A supplier’s SDS describes their raw material, not your finished mixture. If you blend, dilute or repackage a product you become responsible for its classification and for issuing an SDS that reflects your actual formulation — though supplier sheets are a valuable input when preparing it.
