SDS in perfumery: how to read a safety data sheet

The SDS — Safety Data Sheet is one of the most important technical documents when working professionally with perfumery raw materials. Yet it is often read incorrectly: someone sees a pictogram, an H statement or the word Warning and concludes that the ingredient is “too dangerous”, or expects the SDS to answer questions it was never designed to answer.

An SDS is not an olfactory data sheet, an IFRA certificate, an allergen declaration or a certificate of analysis. Its primary purpose is to communicate the hazards and conditions for handling, storage, exposure, emergency response and transport of a substance or mixture as supplied.

In the European Union, the structure of an SDS is defined by Annex II of REACH, as amended by Regulation (EU) 2020/878. Classification and labelling of hazardous substances and mixtures follows the CLP system.

First rule: the SDS describes the material “as supplied”

If you buy a pure raw material, its SDS refers to that material under the supply conditions specified by the manufacturer. If you buy a commercial product that is already diluted — for example, a resinoid at 50% in a solvent or a compounded base — the SDS describes that commercial mixture, not the theoretical substance at 100%.

This matters because classification can change with concentration. A raw material classified as irritating, sensitising or hazardous to the environment in concentrated form does not automatically transfer the same classification to a formula in which it is present at a much lower level.

The finished perfume must be classified on the basis of the finished mixture. You do not simply copy Section 2 from every ingredient SDS.

The 16 sections of an SDS

A European SDS follows a standardised structure of 16 sections. Not all of them carry the same day-to-day importance for a perfumer, but it is useful to know where to find each type of information.

Section 1: make sure the document really matches the product

Before reading the hazards, verify the identity of the material. The commercial name on the SDS should correspond to the product you purchased. This is especially important for bases, commercial grades, natural reconstructions and products supplied already diluted.

Two materials with similar olfactory names can have different compositions, CAS numbers and classifications. Even two commercial grades of the same aroma chemical may differ in stabilisers, purity or isomeric composition.

Also check the revision date. An older SDS is not automatically incorrect, but professional work requires checking whether the supplier has issued a more recent version.

Section 2: the section everyone reads — and the one most easily misinterpreted

Section 2 gives the CLP classification of the product as supplied, together with the relevant label elements.

You may find:

• hazard pictograms;
• a signal word, such as Danger or Warning;
• H statements, which describe hazards;
• P statements, which describe precautionary measures;
• additional EUH statements where applicable.

Examples frequently encountered with perfumery raw materials include:

The presence of H317, for example, does not mean that the raw material is “forbidden on skin”. It means that the product, in the concentration and form in which it is supplied, meets the CLP criteria for skin sensitisation. Evaluation of a finished cosmetic product instead requires the final concentration, complete composition, applicable restrictions and a safety assessment.

H statements and P statements are not the same thing

H statements describe the nature of the classified hazard. P statements describe precautions intended to prevent or manage that hazard.

For example, a P statement requiring protective gloves does not mean that the material is “more toxic” than another material with a different P statement. Precautionary statements are selected according to the classification and conditions of use.

In laboratory work, the useful question is therefore not “How many H statements does this ingredient have?” but: Which hazards do I need to control while weighing, warming, diluting, pouring and storing it?

Section 3: CAS matters, but it does not always reveal the full composition

For a substance, Section 3 can include identifiers such as the CAS number and EC number, together with relevant information about impurities or stabilisers.

For a mixture — for example, a commercial base or accord — Section 3 lists the components that must be disclosed under SDS rules. It is not necessarily the complete formula of the product.

A common mistake is to see three substances in Section 3 of a base and conclude that the base contains only those three ingredients. The complete composition may remain proprietary; the SDS communicates the information that must be disclosed for safety purposes.

Likewise, a CAS number is not always a perfect olfactory identity. Different commercial products can share a general CAS number or represent different isomeric distributions and grades. CAS is therefore an important technical identifier, but it should be read together with the trade name, manufacturer and product-specific documentation.

Section 7: handling and storage

This section is particularly useful when organising a laboratory. It may specify the need to:

• avoid heat, sparks or flames;
• work with adequate ventilation;
• keep the container tightly closed;
• protect the material from light, moisture or extreme temperatures;
• separate it from incompatible substances.

Not all of these instructions concern olfactory stability. Some exist for chemical-safety reasons. For quality-related storage, technical specifications and manufacturer guidance outside the SDS can also be relevant.

Section 8: gloves, eye protection and ventilation

Section 8 contains exposure-control measures and recommended personal protective equipment. For a formulator, this section matters more than it may first appear.

A perfumery laboratory handles small quantities, but often works with highly concentrated materials. The fact that an aroma chemical will later be used at 0.1% in a perfume does not change the concentration of the material in the bottle you are weighing from.

Precautions therefore relate to the actual handling stage. The choice of glove type, eye protection and ventilation should follow the applicable documentation and the laboratory's risk assessment.

Section 9: the most useful section for understanding physical behaviour

For a formulator, Section 9 can be a valuable source of practical information. Depending on the product, it may include:

• physical state;
• colour;
• melting or freezing point;
• boiling point or range;
• flash point;
• vapour pressure;
• density;
• solubility;
• viscosity and other parameters.

These data can help explain why a material crystallises, is highly viscous, needs gentle warming or behaves differently in different solvent systems.

However, statements such as “soluble in alcohol” or “insoluble in water” are physicochemical information, not a complete formulation recipe. The real compatibility of a mixture depends on concentration, the other ingredients, temperature and the solvent system.

For a practical comparison of two technical solvents, see DPG or TEC: which solvent should you choose in perfumery?.

Flash point: what it really means

The flash point is the temperature at which, under the conditions of the test method, a liquid produces enough vapour to form an ignitable mixture with air.

It is important for safety, storage and transport. It does not, however, tell you “how easily the perfume will catch fire” in every situation, and above all the flash point of a raw material is not the flash point of the finished perfume.

In a hydroalcoholic formula, the large proportion of ethanol can determine much of the flammability behaviour of the finished mixture. If a flash-point value is needed for classification or transport of the finished product, the finished product must be assessed.

Section 10: when warming a raw material requires care

Many solid or viscous perfumery materials are gently warmed to make them fluid before weighing. Section 10 helps identify conditions to avoid, incompatibilities and potentially hazardous decomposition products.

“Warm gently to fluidise” does not mean heating a material to arbitrary temperatures. The temperature should be the minimum necessary and compatible with manufacturer documentation and laboratory procedures.

Sections 11 and 12: health and environmental information

Section 11 contains toxicological information, while Section 12 covers environmental effects.

In perfumery materials, classifications relating to irritation, skin sensitisation or aquatic hazards are common. These data matter both for handling the raw material and for subsequent classification of mixtures.

A statement such as H411 does not mean that one drop of the ingredient will automatically cause measurable environmental damage. It means that the substance or mixture meets the classification criteria for that hazard and should be handled and disposed of accordingly.

Section 14: transport — ADR, IMDG and IATA

This section indicates whether the product is classified as dangerous goods for transport and may include:

• UN number;
• proper shipping name;
• hazard class;
• packing group;
• environmental hazard information;
• specific information for ADR/RID, IMDG or IATA.

Another important distinction appears here: CLP classification and transport classification are not the same thing. A material may carry CLP hazard pictograms but not be regulated as dangerous goods for a particular mode of transport, while another product may have specific transport requirements because of flammability or other transport hazards.

Therefore, “not regulated for transport” does not mean “not hazardous”. It means only that the product does not fall under a particular dangerous-goods classification under the stated transport conditions.

Section 16: check the revision and the full text of statements

Section 16 is often ignored, but it can include the full text of abbreviations and H statements used elsewhere, as well as the date or nature of changes made since the previous version.

When you receive a new SDS for the same material, you should not automatically assume the raw material itself has changed. The regulation, classification, supply information or simply the document format may have changed. Comparing revisions is useful.

SDS, IFRA, allergen declaration and CoA: four different documents

This is why it is incorrect to look in an SDS for the “maximum dosage in perfumery”. If an IFRA restriction applies, it must be checked in the relevant IFRA documentation and applied to the correct category. Our guide IFRA Category 4: how to read and calculate limits correctly explains the relationship between fragrance concentrate and finished product.

Does an SDS without pictograms mean I can use the material freely?

No. It means that the product is not classified with those hazard elements under the applicable criteria in the condition in which it is supplied, or that certain label elements are not required. It does not mean:

• there are no IFRA limits;
• there are no allergens;
• there are no cosmetic regulatory obligations;
• the dosage is unlimited;
• any finished formula is automatically safe.

Likewise, an SDS with several pictograms does not mean that the material cannot be used professionally. It means that it needs to be handled in a way consistent with the identified hazards.

Can the raw-material SDS be used as the SDS for the finished perfume?

No. A finished formula is a new mixture. Its classification depends on the complete composition and the actual concentrations of its components, together with the applicable CLP rules.

If the finished product is a cosmetic intended for consumers, the specific obligations of cosmetic legislation also apply. Raw-material documentation is necessary for building the technical dossier, but it does not replace evaluation of the finished product.

How to read an SDS in five minutes

1. Section 1: verify the product, supplier and revision date.
2. Section 2: identify the hazards that matter during actual handling.
3. Section 3: check CAS/EC and remember that a mixture does not necessarily disclose its complete formula.
4. Sections 7–9: review storage, PPE, density, solubility, physical state and flash point.
5. Section 14: check transport information if you need to ship or import the material.

Then consult Sections 10–12 when the material has particular stability, reactivity, health or environmental issues, and Section 16 for revisions and abbreviations.

Conclusion

Reading an SDS properly does not mean memorising every H and P statement. It means understanding what the document describes and what it does not describe.

The SDS tells you how to manage safely the raw material or commercial mixture in front of you. It does not automatically tell you the ideal olfactory dosage, the IFRA limit, the amount of allergens that must be declared, or the classification of the finished perfume.

For a professional formulator, the SDS is the starting point for managing a raw material, not the final step in evaluating the formula.

Technical note: this guide is educational. Professional handling and commercialisation require the current supplier SDS, applicable REACH/CLP rules, IFRA documentation and the other documents required for the finished product.