A safety data sheet (SDS) is a 16-section document that a chemical manufacturer or importer must supply for every hazardous chemical it sells. The sections always appear in the same order, so you read an SDS by jumping to the section that answers your question: Section 2 for hazards, Section 4 for first aid, Section 8 for PPE and exposure limits, Section 14 for shipping classification.
That fixed order is the whole point. OSHA standardized it under the Hazard Communication Standard, 29 CFR 1910.1200, so an EHS manager, a receiving clerk, and an ER physician can each find what they need in seconds without reading the document front to back. This guide breaks down what lives in each section, which ones OSHA actually enforces, what changed under the 2024 HazCom update, and how to get current sheets from your supplier.
What is a safety data sheet, and who has to provide one?
Chemical manufacturers and importers must evaluate the hazards of the chemicals they produce or import and prepare an SDS for each hazardous one. Distributors must pass that SDS down the supply chain. Employers must maintain SDSs for every hazardous chemical in the workplace and keep them readily accessible to employees during each work shift.
Three timing rules govern the paperwork:
- A supplier must send the SDS with the first shipment of a product to a new customer.
- When an SDS is revised, the supplier must send the updated sheet with the first shipment after the revision.
- A manufacturer or importer must update an SDS within three months of learning significant new information about a chemical’s hazards or protective measures.
An SDS is not a certificate of analysis. The SDS describes hazards for a product family; the COA reports the tested results for one specific lot. Buyers in regulated industries need both — see our guide to reading a certificate of analysis.
What are the 16 sections of an SDS?
OSHA fixes the content and order in Appendix D to 1910.1200. Here is what each section holds and who typically uses it.
| # | Section | What it tells you | Primary user |
|---|---|---|---|
| 1 | Identification | Product name, recommended use, supplier name, address, emergency phone number | Purchasing, receiving |
| 2 | Hazard(s) identification | GHS hazard classes and categories, signal word, pictograms, hazard and precautionary statements | Everyone |
| 3 | Composition / information on ingredients | Chemical identity, CAS numbers, concentrations or concentration ranges, impurities | EHS, toxicology |
| 4 | First-aid measures | Treatment by exposure route, symptoms, when to get medical help | First responders, medical |
| 5 | Fire-fighting measures | Suitable extinguishing media, specific hazards, protective equipment for firefighters | Fire brigade, EHS |
| 6 | Accidental release measures | Spill containment, cleanup procedures, personal precautions | Operations, EHS |
| 7 | Handling and storage | Safe handling practices, incompatible materials, storage conditions | Warehouse, plant |
| 8 | Exposure controls / personal protection | OSHA PELs, ACGIH TLVs, engineering controls, required PPE | EHS, industrial hygiene |
| 9 | Physical and chemical properties | Appearance, odor, flash point, boiling point, density, vapor pressure, particle characteristics | Engineering, process |
| 10 | Stability and reactivity | Chemical stability, conditions to avoid, incompatible materials, hazardous decomposition | Process safety |
| 11 | Toxicological information | Routes of exposure, acute and chronic effects, LD50/LC50, carcinogenicity listings | EHS, medical |
| 12 | Ecological information | Aquatic and terrestrial toxicity, persistence, bioaccumulation | Environmental |
| 13 | Disposal considerations | Waste handling and disposal guidance, container disposal | Waste, environmental |
| 14 | Transport information | UN number, proper shipping name, hazard class, packing group, marine pollutant status | Logistics, shipping |
| 15 | Regulatory information | Safety, health, and environmental regulations specific to the product | Compliance |
| 16 | Other information | Date of preparation or last revision, revision summary, abbreviation key | Document control |
Which SDS sections does OSHA actually enforce?
This is the detail most SDS explainers skip. OSHA requires all 16 sections to appear so the format matches the global GHS standard, but OSHA does not enforce the content of Sections 12 through 15. Those sections cover ecological information, disposal, transport, and regulatory status — subject matter that falls under the EPA, the Department of Transportation, and other agencies rather than OSHA.
The practical consequence: Sections 12–15 are useful but not authoritative. If you are classifying a shipment, verify Section 14 against the DOT hazardous materials table rather than treating the SDS as the final word. Our breakdown of DOT hazmat classes for solvents walks through how UN numbers and packing groups are assigned.
Which sections should you read first?
Most people never need all sixteen. Match the section to the question you actually have.
| Your question | Go to |
|---|---|
| Can this hurt someone, and how badly? | Section 2, then Section 11 |
| What PPE does my team need? | Section 8 |
| Is there an exposure limit I have to monitor? | Section 8 |
| Can I store this next to that? | Section 7, then Section 10 |
| Someone was exposed — what now? | Section 4 |
| There is a spill on the dock. | Section 6 |
| How do I ship or receive it? | Section 14 |
| Is this sheet current? | Section 16 |
Section 16 deserves more attention than it gets. It carries the revision date, and a stale revision date is one of the most common findings in a HazCom audit. Check it before you file the sheet, not after the inspector asks.
What changed under OSHA’s 2024 HazCom update?
OSHA published a final rule on May 20, 2024 aligning the Hazard Communication Standard with Revision 7 of the UN’s Globally Harmonized System. It took effect July 19, 2024. The rule revised SDS Appendix D content in Sections 1, 2, 3, 8, 9, 10, 11, and 14, with the principal GHS-alignment changes falling in Sections 2, 3, 9, and 11.
Two changes matter most to buyers. First, trade-secret concentrations can still be withheld, but Section 3 must now disclose the concentration using one of OSHA’s prescribed ranges — you will no longer see a blank where a percentage should be. Second, Section 9 uses revised physical-property terminology and explicitly addresses particle characteristics.
On January 15, 2026, OSHA extended all HCS 2024 compliance dates by four months. The revised schedule:
| Deadline | Who | What |
|---|---|---|
| May 19, 2026 | Manufacturers, importers, distributors | Updated classifications, labels, and SDSs for substances |
| November 2026 | Employers | Workplace labels, written HazCom program, and training for substances |
| November 2027 | Manufacturers, importers, distributors | Updated labels and SDSs for mixtures |
| May 2028 | Employers | Workplace labels, written program, and training for mixtures |
During each transition window, either the 2012 or the 2024 version of the standard is acceptable. Source: OSHA, Final Rule to Amend the Hazard Communication Standard.
How the SDS connects to the drum in front of you
The GHS label on a container is a compressed version of SDS Section 2. Same pictograms, same signal word, same hazard statements — the label is the summary, the SDS is the full record. If a label and an SDS disagree, the SDS revision date tells you which one is out of date. See how to read a GHS label on a chemical drum for the label side of that pairing.
How do you get current SDSs from a distributor?
Ask before you buy. A distributor that cannot produce a current SDS on request is a distributor that will slow down your next audit. RightPath Industries, a Pittsburgh-based bulk chemical distributor supplying 8,000+ chemicals and recognized as a top-10 U.S. ethanol distributor, maintains a public SDS library so buyers and EHS teams can pull documentation without opening a support ticket. Lot-specific COAs ship with the order.
When you evaluate any supplier’s documentation, check four things: the SDS reflects the most recent significant hazard update, the revision date in Section 16 is legible, Section 3 discloses concentrations or OSHA-permitted ranges, and the emergency phone number in Section 1 is answered around the clock.
Browse the full bulk solvent product line, or work through the rest of our chemical guides. Ready to source? Request pricing and we will include documentation with the quote.
Frequently asked questions
How many sections does a safety data sheet have?
A safety data sheet has exactly 16 sections. The number, order, and headings are fixed by OSHA in Appendix D to 29 CFR 1910.1200 and match the UN GHS format used internationally.
What is the difference between an MSDS and an SDS?
An MSDS (material safety data sheet) was the pre-2012 U.S. format, which had no required section order and varied by manufacturer. OSHA replaced it with the 16-section SDS when it aligned HazCom with GHS in 2012. Any sheet still labeled MSDS is out of date and should be replaced.
Which SDS sections are most important for worker safety?
Section 2 and Section 8. Section 2 states what the chemical can do to a person, and Section 8 states the exposure limits and personal protective equipment required to prevent it. Section 4 is the third priority because it governs the response after an exposure occurs.
How often must a safety data sheet be updated?
There is no fixed calendar interval. A chemical manufacturer or importer must revise the SDS within three months of becoming aware of significant new information about the chemical’s hazards or ways to protect against them, and must send the revised sheet with the next shipment to customers who received the product in the prior twelve months.
Does an SDS replace a certificate of analysis?
No. An SDS covers hazard and handling information for a product as a whole and does not change lot to lot. A COA reports the measured test results for one specific production lot. Pharmaceutical, food, and laboratory buyers generally require both documents on every shipment.
Which SDS section has the flash point?
Section 9, Physical and chemical properties. That section also carries physical state, odor, pH, melting and boiling point, flammability, vapor pressure, relative density, solubility, and viscosity.
Which SDS section has the UN number and shipping name?
Section 14, Transport information. It lists the UN number, UN proper shipping name, transport hazard class, packing group, environmental hazards, and any special precautions. Section 14 is non-mandatory under OSHA, but virtually all suppliers populate it because shippers need it.
Can we keep SDSs electronically instead of in binders?
Yes. OSHA explicitly permits electronic access and other alternatives to paper copies, as long as no barriers to immediate employee access are created in each workplace. Employees must be able to reach the sheet during their shift, in their work area, without waiting for someone else.
Authoritative sources
- 29 CFR 1910.1200 Appendix D — Safety Data Sheets (Mandatory)
- 29 CFR 1910.1200 — Hazard Communication Standard
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