“MSDS” and “SDS” are often used interchangeably, and for good reason — they name the same kind of document: the hazard communication sheet that travels with a chemical from manufacturer to end user. The difference is one of era and format. The Material Safety Data Sheet (MSDS) is the older, free-form version that predates the global standardisation of chemical hazard communication. The Safety Data Sheet (SDS) is the current, internationally harmonised version with a fixed 16-section structure.
This article explains what separates the two, why the change happened, and — the question most people are really asking — whether an “MSDS” is still acceptable today. If you manage a chemical inventory, review supplier documents, or maintain a hazard communication program, the short answer is that you should be working with SDSs, and any document still labelled MSDS is a signal to request an update.
At a glance
The MSDS and the SDS are two generations of the same document. The MSDS was the United States’ pre-GHS format: there was no legally required number of sections, no mandated order, and layouts differed from supplier to supplier. The SDS is the format introduced by the United Nations Globally Harmonized System (GHS) — 16 numbered sections in a fixed sequence, used worldwide. In US workplaces the SDS has been the required format since June 1, 2015. In the European Union, the SDS has been the standard for far longer, and the term “MSDS” was never part of EU law. A document still presented as an MSDS today is, in practice, an outdated SDS.
What is an MSDS?
A Material Safety Data Sheet was the document US suppliers used to communicate chemical hazards under the original Hazard Communication Standard (HCS 1994). It listed the same broad categories of information found on a modern SDS — identity, hazards, first aid, handling, and so on — but the standard did not dictate a fixed section count or a required order. Two suppliers could produce MSDSs for the same chemical that looked nothing alike: different headings, different sequence, different level of detail. That inconsistency made MSDSs slower to read in an emergency and harder to compare across products, which is precisely the problem the GHS set out to solve.
The “Material” in the name reflects its origin in US workplace-safety practice. It is a legacy term: still heard in conversation, occasionally still printed on out-of-date documents, but no longer the required format anywhere that has adopted the GHS.
What is an SDS?
A Safety Data Sheet is the standardised document defined by the UN GHS, whose first edition appeared in 2003. The GHS specifies exactly 16 sections in a fixed order, from Section 1 (Identification) through Section 16 (Other Information). Because the structure comes from a single international source, an SDS authored in Germany, the United States, or Japan carries the same headings in the same sequence — a reader always knows that first-aid measures are in Section 4 and disposal in Section 13.
The 16-section format was adopted into national and regional law through the GHS implementation process: in the United States through OSHA’s Hazard Communication Standard (29 CFR 1910.1200, Appendix D), and in the European Union through Annex II of the REACH Regulation. The headings are harmonised even where small regional differences exist in mandatory content.
MSDS vs SDS: the key differences
| Aspect | MSDS (legacy) | SDS (current) |
|---|---|---|
| Full name | Material Safety Data Sheet | Safety Data Sheet |
| Status | Superseded in the US; obsolete elsewhere | Required worldwide standard |
| Format | Free-form, no mandated layout | Fixed 16 numbered sections in a set order |
| Section count and order | Varied by supplier | Always 16, identical order globally |
| Origin of the format | Pre-GHS national practice | UN GHS (Annex 4), first edition 2003 |
| US legal basis | HCS 1994 | OSHA HCS, 29 CFR 1910.1200, Appendix D |
| EU legal basis | Not applicable (EU used “safety data sheet”) | REACH Annex II, Regulation (EU) 2020/878 |
| Required since (US) | — | June 1, 2015 |
The practical upshot of the table is simple: “SDS vs MSDS” is less a comparison of two competing formats than a before-and-after picture of the same document. The SDS is what the MSDS became once hazard communication was standardised.
Why the format changed: GHS and OSHA HCS 2012
OSHA issued the final rule modifying the Hazard Communication Standard on March 26, 2012, aligning the US with the GHS. The revised standard set a transition timetable: chemical manufacturers, importers, and distributors had to provide the 16-section SDS — rather than the older MSDS — for all shipments of hazardous chemicals by June 1, 2015. Distributors were given until December 1, 2015 to update labels on shipped containers, and employers had until June 1, 2016 to finish updating their written programs and training. After June 1, 2015, any shipment of a hazardous chemical had to be accompanied by an SDS in the required 16-section format.
The goal was consistency. A standardised structure means an emergency responder, a warehouse worker, or a compliance officer can find the information they need in the same place on every sheet, and it makes documents from different suppliers directly comparable.
Is an “MSDS” still valid today?
In the United States, a document still formatted as an MSDS is outdated. The SDS has been the required format since 2015, and an employer who receives an HCS-compliant SDS must replace the corresponding MSDS. If a current supplier sends you something labelled “MSDS,” treat it as a flag that the document needs to be brought up to date.
The standard has continued to evolve since the original switch. In May 2024 OSHA finalised a significant update — HCS 2024 — that aligns the US with the seventh revised edition of the GHS (and incorporates parts of the eighth), with changes to hazard classification, label elements, and SDS content. That update took effect on July 19, 2024, with a phased compliance schedule. On January 15, 2026, OSHA extended every HCS 2024 compliance date by four months: the first deadline for manufacturers, importers, and distributors evaluating substances moved from January 19, 2026 to May 19, 2026, with the remaining dates running through May 19, 2028 for mixtures. During the transition, a covered entity may comply with the 2012 standard, the 2024 standard, or a combination of both until its applicable date arrives. In other words, the SDS is not a fixed target — current SDSs must reflect the HCS 2024 classification and content changes as those deadlines take effect.
In the European Union, the question of “MSDS or SDS” never arose, because EU law has used the term safety data sheet throughout. The current rules sit in Annex II of REACH, as replaced by Commission Regulation (EU) 2020/878 of 18 June 2020, which applies from 1 January 2021. SDSs in the previous format could be supplied until 31 December 2022, so since the start of 2023 the 2020/878 format has been mandatory across the EU market.
What to do if you still have MSDS on file
If your records still contain MSDSs, the fix is straightforward:
- Request the current SDS from the supplier. Under OSHA HCS, manufacturers, importers, and distributors must provide an SDS to downstream customers free of charge, and must issue an updated version when one is prepared. Under EU REACH, suppliers must provide a compliant SDS in the official language of each member state where the product is sold.
- Do not discard the old document until the new one arrives. OSHA requires employers to retain the most recently received version of the MSDS or SDS, so an MSDS for a product whose manufacturer is no longer reachable still has to be kept on file.
- Replace, then verify the format. When the SDS arrives, confirm it follows the 16-section structure and reflects the current classification rules, then retire the MSDS for that product.
For organisations with large inventories, this is also a prompt to review how SDSs are stored, kept current, and made accessible to employees on every shift — an ongoing obligation under the Hazard Communication Standard, not a one-time swap.
Key takeaways
- MSDS and SDS describe the same document at two stages: the MSDS is the legacy, free-form US version; the SDS is the current GHS 16-section standard.
- In the US, the SDS replaced the MSDS under OSHA HCS, with full compliance required by June 1, 2015.
- The SDS has exactly 16 sections in a fixed order worldwide; the MSDS had no mandated count or sequence.
- The EU never used “MSDS”; its SDS rules are in REACH Annex II, currently Regulation (EU) 2020/878.
- An “MSDS” received today is a sign to request the current SDS — and current SDSs must keep pace with HCS 2024 as its deadlines phase in through 2028.
Related articles in this hub
- Safety Data Sheet Format: 16 Sections Explained — a section-by-section walkthrough of the 16-section SDS.
- About SDS — the full Safety Data Sheet pillar: scope, requirements, and regulatory history.
- OSHA HCS 2024 Changes — how the 2024 update and its extended deadlines affect SDS content.
Sources
- OSHA, Hazard Communication Standard, 29 CFR 1910.1200. U.S. Occupational Safety and Health Administration. Available at: https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1200
- OSHA, Letter of interpretation: “Clarification on effective date of SDSs replacing MSDSs,” 13 June 2014. Available at: https://www.osha.gov/laws-regs/standardinterpretations/2014-06-13
- OSHA, Hazard Communication Standard 2024 final rule, 89 FR 44144, 20 May 2024 (effective 19 July 2024).
- OSHA, HCS 2024 compliance-date extension (four-month extension), final rule of 15 January 2026. Available at: https://www.osha.gov/hazcom/rulemaking/extension
- Commission Regulation (EU) 2020/878 of 18 June 2020 amending Annex II to Regulation (EC) No 1907/2006 (REACH). Official Journal of the European Union. Available at: https://eur-lex.europa.eu/eli/reg/2020/878/oj/eng
- UN GHS, Globally Harmonized System of Classification and Labelling of Chemicals, Annex 4 (Guidance on the preparation of Safety Data Sheets). United Nations Economic Commission for Europe (UNECE).