How to Read a Safety Data Sheet (SDS/GHS)¶

Q: How do I know if an SDS is current?

Check Section 16 for the revision date. Under REACH, manufacturers must update the SDS without delay after any change affecting hazard classification or risk management.

Q: Can I use the same SDS for the EU and the US?

The GHS standard is internationally harmonised, but implementation differs. An EU SDS must be in the Member State's official language. A US SDS must follow OSHA HazCom.

Q: Who enforces SDS compliance?

In the EU: national enforcement authorities coordinated by ECHA. In the US: OSHA. Non-compliance can result in fines, product withdrawal, and criminal liability for wilful violations.

Every chemical product that enters the supply chain must be accompanied by a Safety Data Sheet. If you manufacture, import, ship, store, or use chemicals — even indirectly, as a component in a finished product — you have held an SDS in your hands. And if you are like most people, you have skimmed the first page and filed the rest.

An SDS is not compliance theatre. It is a structured, legally mandated document designed to communicate hazard information quickly and consistently across every language and jurisdiction. Knowing how to read one — all 16 sections — can prevent a warehouse fire, a customs detention, or a worker injury.

Here is how to read every section of an SDS, with the Globally Harmonized System (GHS) as the standard reference.

What Is a Safety Data Sheet?¶

A Safety Data Sheet — formerly called a Material Safety Data Sheet (MSDS) — is a standardised document that communicates the hazards of a chemical substance or mixture. It is required by law in every jurisdiction that has adopted the UN Globally Harmonized System of Classification and Labelling of Chemicals (GHS), which now covers over 70 countries including the EU (REACH/CLP), the US (OSHA HazCom), the UK, Canada, Australia, Japan, China, and most of the developed world.

An SDS is intended for professional users — workers handling chemicals, logistics operators transporting them, emergency responders dealing with spills or fires, and compliance officers ensuring regulatory conformance. It is not a consumer document (consumer products use product labels instead).

The 16 Sections of a GHS Safety Data Sheet¶

The GHS standard organises every SDS into 16 mandatory sections in a fixed order. Here is what each section contains and how to read it:

Section 1: Identification¶

The product identifier (chemical name or trade name), the recommended use, and the supplier's contact details — including an emergency telephone number. This is the section you check to confirm the SDS matches the product in front of you.

Section 2: Hazard Identification¶

The most critical section for safety. It contains:

GHS hazard classification — the hazard class and category (e.g., "Flammable Liquid Category 2", "Acute Toxicity Category 3")
Signal word — "Danger" (more severe) or "Warning" (less severe)
Hazard statements — standardised H-phrases (e.g., H225: "Highly flammable liquid and vapour")
Precautionary statements — standardised P-phrases (e.g., P210: "Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.")
Hazard pictograms — the diamond-shaped symbols showing at a glance what dangers the chemical presents

Section 3: Composition / Information on Ingredients¶

The chemical identity of the substance or mixture, including CAS numbers, EC numbers, and concentration ranges. For mixtures, hazardous ingredients above a threshold concentration must be listed. Trade secret ingredients may be listed with generic names if the specific identity is protected, but the hazard classification must still be accurate.

Section 4: First Aid Measures¶

What to do if someone is exposed — by inhalation, skin contact, eye contact, or ingestion. Lists symptoms and the immediate actions required. Also states when immediate medical attention is necessary.

Section 5: Firefighting Measures¶

What extinguishing media to use (and not to use), specific hazards from the chemical during a fire (toxic fumes, explosion risk), and special protective equipment for firefighters.

Section 6: Accidental Release Measures¶

What to do if the chemical spills. Personal precautions, protective equipment, environmental precautions (prevent entry into drains and waterways), and containment/cleanup methods.

Section 7: Handling and Storage¶

Safe handling practices — ventilation requirements, grounding for flammable liquids, incompatible materials to keep separated. Storage conditions — temperature limits, humidity restrictions, maximum storage duration.

Section 8: Exposure Controls / Personal Protection¶

Occupational exposure limits (OELs) — the maximum airborne concentration a worker can be exposed to over an 8-hour shift. Required personal protective equipment (PPE): gloves, eye protection, respiratory protection, protective clothing. Engineering controls: local exhaust ventilation, enclosed processes.

Section 9: Physical and Chemical Properties¶

Appearance, odour, pH, melting/freezing point, boiling point, flash point, flammability limits, vapour pressure, density, solubility. This section helps you understand what the substance looks like and how it behaves physically — essential for storage design and spill response.

Section 10: Stability and Reactivity¶

Chemical stability under normal conditions, conditions to avoid (heat, shock, friction), incompatible materials (strong oxidisers, acids, bases), and hazardous decomposition products (what toxic gases are released if it burns).

Section 11: Toxicological Information¶

Health effects data: acute toxicity (LD50/LC50 values), skin corrosion/irritation, eye damage, respiratory or skin sensitisation, carcinogenicity, reproductive toxicity, specific target organ toxicity. This section tells you what the chemical does to the human body.

Section 12: Ecological Information¶

Environmental toxicity data: aquatic toxicity (LC50 for fish, EC50 for daphnia, algae), persistence and degradability, bioaccumulation potential, mobility in soil. Required for environmental risk assessment and spill response planning.

Section 13: Disposal Considerations¶

How to dispose of the chemical and its container safely and legally. References to applicable waste regulations.

Section 14: Transport Information¶

UN number, proper shipping name, transport hazard class, packing group, environmental hazards, and any special precautions for transport by road (ADR), rail (RID), sea (IMDG), or air (IATA). This section is read by logistics operators and customs authorities.

Section 15: Regulatory Information¶

Safety, health, and environmental regulations specific to the chemical. Includes any restrictions, authorisations under REACH, or specific national requirements.

Section 16: Other Information¶

Revision date, abbreviations used, key literature references, and a disclaimer. This section tells you when the SDS was last updated — a stale SDS is a compliance risk.

How to Read the Hazard Pictograms¶

The nine GHS hazard pictograms are the visual shorthand of chemical safety. Each is a red diamond with a black symbol on a white background:

Pictogram	Meaning	Examples
Exploding bomb	Explosive, self-reactive, organic peroxide	TNT, ammonium nitrate
Flame	Flammable, self-heating, pyrophoric, emits flammable gas	Acetone, propane
Flame over circle	Oxidiser	Hydrogen peroxide, nitric acid
Gas cylinder	Gas under pressure	Compressed air, liquid nitrogen
Corrosion	Skin corrosion, eye damage, corrosive to metals	Sulfuric acid, sodium hydroxide
Skull and crossbones	Acute toxicity (fatal or toxic)	Cyanide, methanol
Exclamation mark	Irritant, skin sensitiser, acute toxicity (harmful), narcotic	Bleach, isopropanol
Health hazard	Carcinogen, respiratory sensitiser, reproductive toxicity, specific target organ toxicity	Benzene, asbestos
Environment	Hazardous to the aquatic environment	Pesticides, mercury compounds

Signal Words: Danger vs. Warning¶

GHS uses exactly two signal words:

Danger — used for the more severe hazard categories (Categories 1 and 2)
Warning — used for the less severe (Category 3 and below)

A chemical can carry only one signal word. If multiple hazards exist, "Danger" takes precedence. The absence of a signal word means the chemical is not classified as hazardous under GHS.

Who Is Responsible for Providing the SDS¶

The manufacturer, importer, or distributor placing the chemical on the market is legally responsible for creating and providing an accurate SDS. Under EU REACH, the SDS must be provided in the official language of the Member State where the chemical is placed on the market. Under US HazCom (OSHA), it must be in English.

The SDS must be updated whenever new hazard information becomes available, or when a restriction or authorisation status changes. An outdated SDS is non-compliant and carries the same legal exposure as no SDS.

The SDS in Your Compliance Workflow¶

For manufacturers and importers, the SDS is not a standalone document. It connects to multiple regulatory obligations:

REACH compliance: The SDS references REACH registration numbers and any authorisations or restrictions
TSCA compliance (US): The SDS must reflect TSCA inventory status
Customs documentation: The SDS supports transport classification (Section 14) required for shipping and border clearance
Workplace safety: The SDS is the basis for workplace risk assessments under occupational health and safety regulations
Product compliance: If your product contains a chemical mixture, your downstream customers will request your SDS before they can complete their own compliance documentation

Sustalium publishes Safety Data Sheets as live, hashcode-verified public pages through its Generator framework. The structured format ensures every section is present and correctly labelled. A single SDS is published once and made accessible to every downstream customer via a permanent URL — no re-sending, no version confusion. The same compliance infrastructure that powers CE Declarations, REACH statements, and GPSR documentation also hosts your SDS library.

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Frequently Asked Questions¶

How do I know if an SDS is current?¶

Check Section 16 for the revision date. An SDS should be reviewed and updated whenever new hazard information becomes available. Under REACH, manufacturers must update the SDS "without delay" after any change that affects the hazard classification or risk management measures.

Do I need an SDS for every product I import?¶

Only if the product is a chemical substance or mixture, or if it contains a chemical substance that is released under normal use. A finished article (e.g. a plastic chair) generally does not require an SDS unless it contains a substance intended to be released.

Can I use the same SDS for the EU and the US?¶

The GHS standard is internationally harmonised, but the implementation differs. An EU SDS must be in the official language of the Member State and reference REACH/CLP regulations. A US SDS must follow OSHA HazCom and be in English. While the 16-section structure is the same, you typically need jurisdiction-specific versions.

Who enforces SDS compliance?¶

In the EU: national enforcement authorities in each Member State, coordinated by ECHA. In the US: OSHA. Non-compliance can result in fines, product withdrawal, and — in the case of wilful violations — criminal liability.