A Safety Data Sheet (SDS) is the standardized, 16-section document that accompanies every hazardous chemical in a lab and tells you what it is, how it can hurt you, and what to do if something goes wrong. Knowing how to find the information you actually need in an SDS — quickly, and before an incident, not during one — is a basic lab-safety skill for anyone who works with chemicals.
What Is an SDS, and Why Does It Look the Way It Does?
In the United States, SDSs are required under OSHA’s Hazard Communication Standard (HCS), 29 CFR 1910.1200. The 2012 revision of the HCS aligned U.S. requirements with the United Nations’ Globally Harmonized System of Classification and Labelling of Chemicals (GHS), which is why an SDS produced anywhere in the world today follows the same 16-section structure, in the same order. Before 2012, U.S. workplaces used a similar but non-standardized document called a Material Safety Data Sheet (MSDS); OSHA required all MSDSs to be converted to the GHS-aligned SDS format for chemicals shipped after June 1, 2015. If you find an old MSDS in a lab binder today, treat it as outdated and look for a current SDS from the manufacturer instead.
Chemical manufacturers, importers, and distributors are required to provide an SDS for every hazardous chemical they sell. Employers are required to maintain an accessible SDS for every hazardous chemical present in the workplace — in the lab, this usually means an electronic SDS management system, though a physical binder is still acceptable under the HCS as long as it’s genuinely accessible during all working shifts, including in a power outage.
SDS vs. GHS Label: Two Different Documents, One System
An SDS is easy to confuse with the GHS container label, since both come from the same underlying hazard classification system and use some of the same information. They are not interchangeable:
- The GHS label is the short, at-a-glance warning physically attached to the container — product identifier, pictograms, a signal word (Danger or Warning), hazard statements, and precautionary statements. It is designed to be read in seconds, before you ever open the container.
- The SDS is the full, multi-page technical reference behind that label — composition, first-aid measures, handling and storage requirements, exposure limits, physical and chemical properties, and more. It is designed to be consulted for detail, not skimmed in a hurry.
For a full walkthrough of pictograms, signal words, and hazard/precautionary statement codes, see Understanding GHS Labels: Pictograms, Signal Words, and Hazard Statements. This guide covers the document behind the label.
The 16 Sections of an SDS, in Order
Every SDS follows the same 16-section sequence, whether it comes from Sigma-Aldrich, Fisher Scientific, or a small specialty supplier. OSHA groups them functionally: Sections 1–8 are general information most workers need day to day; Sections 9–11 and 16 are technical/scientific detail; Sections 12–15 are included for GHS/international consistency but OSHA does not enforce their content directly (other agencies, such as EPA and DOT, regulate that information separately). Knowing this grouping helps you find what you need fast instead of reading top to bottom every time.
Section 1: Identification
Product identifier (matches the container label), recommended use and restrictions on use, manufacturer/supplier contact information, and an emergency phone number. Start here to confirm you have the SDS for the exact product and formulation in front of you — not a similarly-named product from the same manufacturer.
Section 2: Hazard(s) Identification
The chemical’s GHS hazard classification, signal word, hazard statements, precautionary statements, and pictograms — this section mirrors what’s on the container label and is the fastest place to get an overall risk picture.
Section 3: Composition/Information on Ingredients
Chemical identity and concentration of the substance, or for a mixture, the ingredients that contribute to its hazards. Trade-secret ingredients can be withheld from this section under specific HCS provisions, but the hazard information itself still must be disclosed.
Section 4: First-Aid Measures
What to do immediately after eye contact, skin contact, inhalation, or ingestion, including symptoms and effects, and when to seek medical attention. This is the section to read before you need it — not while someone is standing at the eyewash station.
Section 5: Fire-Fighting Measures
Suitable (and unsuitable) extinguishing media, specific hazards arising from the chemical when it burns (e.g., toxic decomposition products), and protective equipment for firefighters.
Section 6: Accidental Release Measures
Personal precautions, protective equipment, and emergency procedures for a spill, plus containment and cleanup methods. Pair this section with your lab’s own spill response plan and kit — see Chemical Spill Kits: What to Stock and How to Respond to a Lab Spill.
Section 7: Handling and Storage
Precautions for safe handling and conditions for safe storage, including incompatibilities with other chemicals (acids stored away from bases, oxidizers away from flammables, and so on). This is the section to cross-check before you put a new chemical away on a shared shelf.
Section 8: Exposure Controls/Personal Protection
Occupational exposure limits (OSHA PELs, ACGIH TLVs where applicable), appropriate engineering controls (fume hoods, local exhaust), and the personal protective equipment needed for safe handling. Use this section alongside your lab’s PPE selection process — see PPE Selection for Chemical Handling in the Lab: Gloves, Eyewear, and Lab Coats.
Section 9: Physical and Chemical Properties
Appearance, odor, pH, melting/freezing point, boiling point, flash point, flammability, vapor pressure, density, solubility, and similar physical data. Useful for predicting behavior (will it evaporate quickly? Is it denser than water and likely to sink if spilled into a drain trap?).
Section 10: Stability and Reactivity
Chemical stability, possibility of hazardous reactions, conditions to avoid, incompatible materials, and hazardous decomposition products. This is where you’ll find whether a chemical is water-reactive, peroxide-forming, or otherwise reactive under conditions you might not expect.
Section 11: Toxicological Information
Routes of exposure, symptoms, acute and chronic health effects, and numerical toxicity data (e.g., LD50/LC50 values) where available. This is the deepest health-effects detail on the sheet.
Section 12: Ecological Information
Ecotoxicity, persistence and degradability, and bioaccumulation potential. Not enforced by OSHA, but relevant for environmental compliance and waste characterization.
Section 13: Disposal Considerations
Guidance on proper disposal, including any special handling needed for the waste itself. This informs, but does not replace, your institution’s own chemical waste procedures — see Chemical Waste Disposal Procedures for a Closing Laboratory and Satellite Accumulation Areas: Rules for Chemical Waste at the Point of Generation for the regulatory mechanics of accumulating and disposing of it correctly.
Section 14: Transport Information
UN shipping name and number, transport hazard class, packing group, and any special precautions for shipping the substance — relevant to your institution’s shipping/receiving staff more than to bench researchers.
Section 15: Regulatory Information
Safety, health, and environmental regulations specific to the product (e.g., TSCA, EPCRA, state right-to-know lists) that aren’t already captured elsewhere on the sheet.
Section 16: Other Information
Date of preparation or last revision of the SDS, and any other information not captured in Sections 1–15. Always check this date: an SDS more than a few years old may not reflect the manufacturer’s current hazard classification, and it’s worth confirming you have the latest version, especially for a chemical you handle in bulk.
How to Actually Use an SDS (Not Just Store It)
A binder or database full of SDSs that nobody has ever opened doesn’t meet the intent of the Hazard Communication Standard, even if it technically satisfies the letter of “maintained and accessible.” A few practices that make SDSs functionally useful rather than a compliance artifact:
- Read Sections 2, 4, 6, and 7 before you first use a new chemical — not after an incident. That’s the hazard overview, first aid, spill response, and storage/incompatibility information you’d otherwise be looking up under time pressure.
- Cross-reference Section 7 (storage) against your actual shelf layout when a new chemical arrives, rather than assuming last year’s storage plan still accounts for everything currently in the lab. This connects directly to broader chemical storage compatibility and inventory practices — see Lab Chemical Inventory Management: Systems and Best Practices.
- Confirm the SDS matches the exact product and formulation using Section 1 — manufacturers often sell multiple concentrations or grades of the same nominal chemical, each with a different SDS.
- Check the revision date in Section 16 periodically for chemicals used in large quantity or high frequency, and request an updated SDS from the supplier if yours looks stale.
Common Mistakes When Reading an SDS
- Treating the SDS as a one-time onboarding document instead of a working reference. New lab members should be shown how to locate and navigate an SDS as part of initial training, not just told the binder exists.
- Confusing an SDS with the GHS label and assuming the label alone gives you everything you need for handling and storage decisions. The label is a summary; the SDS is where the handling, storage, and exposure-control detail actually lives.
- Relying on an outdated MSDS pulled from an old binder instead of the current GHS-format SDS, especially for older stock or legacy chemicals that haven’t been reordered recently.
- Skipping Section 10 (Stability and Reactivity) for chemicals that seem routine. Reactivity hazards — water-reactivity, peroxide formation, incompatibility with common lab materials — are exactly the kind of risk that isn’t obvious from a chemical’s everyday use.
Frequently Asked Questions
What’s the difference between an SDS and an MSDS?
They serve the same basic purpose, but an MSDS (Material Safety Data Sheet) is the pre-2012, non-standardized U.S. predecessor document. The SDS is the GHS-aligned, 16-section format that replaced it; OSHA required the switch for chemicals shipped after June 1, 2015. If you’re still working from an MSDS, it’s out of date — request a current SDS.
What’s the difference between an SDS and a GHS label?
The GHS label is the short warning physically on the container (pictograms, signal word, hazard/precautionary statements); the SDS is the full multi-page technical document behind it, covering everything from first aid to disposal in 16 standardized sections. See Understanding GHS Labels for the label side of the system.
Who is legally required to provide an SDS?
Under OSHA’s Hazard Communication Standard, chemical manufacturers, importers, and distributors must provide an SDS for every hazardous chemical they sell. Employers must then maintain those SDSs and make them readily accessible to employees during all work shifts.
Do I need to memorize all 16 sections of an SDS?
No. Most day-to-day use concentrates on Sections 1, 2, 4, 6, 7, and 8 (identification, hazards, first aid, spill response, storage, and PPE). Sections 9–11 and 16 are more technical reference detail, and Sections 12–15 are largely relevant to environmental, shipping, and regulatory staff rather than bench researchers.
Are Sections 12–15 of an SDS legally required?
They are included on every SDS to stay consistent with the international GHS format, but OSHA does not enforce the content of Sections 12–15 under the Hazard Communication Standard — that information falls under other agencies’ regulatory authority (for example, EPA for ecological and disposal information, DOT for transport).
Where can I find the SDS for a specific chemical?
Most institutions maintain a centralized SDS management system (often integrated with the lab’s chemical inventory system) that’s searchable by product name or manufacturer. If your lab doesn’t have one, the manufacturer’s website almost always hosts current SDSs for its products, searchable by product name or catalog number.
