HazCom vs GHS: What's the Difference? A Clear Explanation

GHS is the international system; HazCom is the US law that adopts it. The Globally Harmonized System (GHS) is a non-binding framework the United Nations built so every country classifies and labels chemicals the same way. The Hazard Communication Standard (HazCom), 29 CFR 1910.1200, is OSHA's enforceable regulation that adopts that framework into US law. If you are a US employer, you comply with HazCom, which uses the GHS format; the GHS itself creates no obligation for you. There is no separate "GHS certificate" to chase. Think of GHS as the blueprint and HazCom as the building code the inspector actually cites.

The short answer

What is GHS?

The Globally Harmonized System of Classification and Labelling of Chemicals (GHS) was developed by the United Nations and first published in 2003. Its purpose is to replace a patchwork of conflicting national systems with one set of criteria for:

• Classifying chemical hazards (physical, health, and environmental)
• Labeling containers with standardized elements (pictograms, signal words, hazard and precautionary statements)
• Communicating detail through a 16-section Safety Data Sheet (SDS)

Before GHS, the same chemical might be "toxic" in one country, "harmful" in another, and "dangerous" in a third, with different symbols on each. GHS gives everyone identical building blocks. Crucially, GHS is published as a model regulation: the UN revises it on a two-year cycle, and each jurisdiction chooses which revision and which "building blocks" to adopt. That is exactly why national rules, including HazCom, never match the latest GHS edition perfectly.

GHS key elements

Learn more: GHS Pictograms Explained: What Each Symbol Means.

What is HazCom?

OSHA's Hazard Communication Standard (29 CFR 1910.1200) is the enforceable US regulation. It predates GHS (it was first issued in 1983 as a performance-based "right-to-know" rule), and was later rebuilt around GHS:

HazCom requires employers to:

1. Maintain a written HazCom program describing how labels, SDS, and training are handled: generate one free with the HazCom Program Generator.
2. Keep an SDS accessible during every work shift for each hazardous chemical (29 CFR 1910.1200(g)(8)).
3. Label all containers, including in-house secondary containers, per 29 CFR 1910.1200(f).
4. Train employees on chemical hazards before initial assignment and whenever a new hazard is introduced.

HazCom goes beyond GHS

HazCom adds enforceable employer obligations that the GHS framework does not impose. OSHA noted in 2012 that the GHS has no written-program requirement and no training requirements, though it discusses the importance of training (77 FR 17581, 17600):

• Written program requirement: GHS doesn't mandate a written program; HazCom does.
• Employee training: GHS classifies hazards; it is not a training standard. HazCom requires training before initial assignment.
• Workplace (secondary) labeling: HazCom sets enforceable in-house container rules under 29 CFR 1910.1200(f)(6).
• Trade-secret / CBI protections: the GHS gives countries principles for confidential business information (77 FR 17737); HazCom sets the US rule, letting a manufacturer withhold specific chemical identity under strict conditions (1910.1200(i)); see SDS Trade Secrets & CBI Rules.
• Construction adoption: 29 CFR 1926.59 extends the identical requirements to construction worksites.
• Enforcement: GHS has no penalty mechanism; HazCom carries fines up to $16,550 per serious violation.

Side-by-side comparison

The single biggest difference: 9 GHS pictograms vs 8 OSHA pictograms

The UN GHS defines nine pictograms. OSHA's system has only eight under 29 CFR 1910.1200, Appendix C. The ninth, the Environment symbol (GHS09, the dead tree and fish), is voluntary in the US.

The reason is jurisdictional, not safety-based: OSHA's authority under the OSH Act of 1970 covers worker safety, not ecosystems. Aquatic and environmental toxicity is the EPA's domain (Clean Water Act, RCRA, CERCLA). So OSHA adopted the eight pictograms that communicate physical and health hazards and left GHS09 optional. A US label meets the standard without GHS09, and a manufacturer, importer or distributor may add it as long as it does not get in the way of the required information (OSHA directive CPL 02-02-079). For the full breakdown, see The 8 OSHA Pictograms vs the 9 GHS Pictograms.

The ninth symbol is only the gap you can see. Read with OSHA's label rules, Japan's government classifications of chemicals active in U.S. commerce would put the health hazard pictogram on 66% of labels, and 68% would carry the signal word "Danger", as our GHS hazard statement index shows.

Worked example: a label from a Canadian supplier

A US contractor receives a drum of solvent-based coating from a Canadian (WHMIS) supplier. The label shows GHS02 (Flame), GHS07 (Exclamation Mark), GHS08 (Health Hazard), and GHS09 (Environment), which the supplier added voluntarily (WHMIS does not require it), with hazard statements that follow the Canadian wording.

Is this label OSHA-compliant? Walk it through HazCom's shipped-container rule (29 CFR 1910.1200(f)(1)):

As shown, the label is not acceptable in the US: since HCS 2024, the responsible party must appear with a U.S. address and U.S. telephone number, which a Canadian supplier's label can miss, and the statements must match Appendix C and be in English ((f)(2)). The extra GHS09 symbol, on the other hand, is permitted. Check incoming labels against the six required shipped-label elements to catch what a foreign label can miss.

The 2024 update and the deadlines that move

The HCS 2024 final rule re-aligned HazCom primarily with GHS Revision 7 and added several hazard classes: Desensitized Explosives (App B.17), updated Aerosols including a non-flammable Category 3 (App B.3), and Chemicals Under Pressure (App B.3.2). It also added a practical small container labelling paragraph for shipped containers (1910.1200(f)(12)). A separate January 15, 2026 rule then extended every compliance date by four months:

During the interim, you may comply with the 2012 HCS, the 2024 HCS, or both. For a deep dive see OSHA HazCom 2024 Updates and the GHS Revision 7 Transition Wizard.

Common misconceptions

"We need to comply with GHS."

Clarification: You comply with HazCom. HazCom adopts GHS, so meeting HazCom means you're already using GHS-format labels and 16-section SDS. There is no standalone "GHS compliance" for a US workplace.

"GHS replaced MSDS with SDS."

Clarification: It was HazCom 2012, by adopting GHS, that replaced the MSDS with the 16-section SDS. An MSDS you received before June 1, 2015 still counts, unless the supplier has since sent a new SDS that you didn't keep (OSHA letter of interpretation, July 27, 2015). See SDS: 16 Sections Explained.

"A GHS label is valid anywhere in the world."

Clarification: No. Each country adopts a different GHS revision and different building blocks. The EU (CLP) uses the environment pictogram for aquatic hazards; Canada (WHMIS) does not require it, like OSHA, whose system has eight pictograms. A label compliant in Europe may carry elements (or omit US-required ones) that make it not automatically valid here, and vice versa.

"GHS09 is the ninth OSHA-required pictogram."

Clarification: It is not. GHS09 (Environment) is voluntary in the US: OSHA requires only the eight in Appendix C. Citing a subcontractor for not having GHS09 is a mistake.

What you need to do

1. Check your written program: is it current with the HCS 2024 changes that affect your chemicals, by the November 20, 2026 employer date for substances (as necessary, (j)(2)(ii))? Generate an updated one.
2. Audit your labels: are secondary containers labeled per 29 CFR 1910.1200(f)(6)? Build them with the GHS Label Generator.
3. Verify your SDS library: every on-site chemical needs a current 16-section SDS, accessible each shift. Run a gap analysis.
4. Document training: record who was trained, when, and on what. Training Record Template.
5. Score your compliance: benchmark with the HazCom Compliance Scorer.

Comply with HazCom; GHS is the format it uses

GHS is the international language; HazCom is the US law that speaks it. Focus on HazCom (29 CFR 1910.1200): written program, accessible SDS, proper labels, and trained employees. The main differences from the GHS are the eight-vs-nine pictogram rule, the hazard classes OSHA did not adopt, such as the environmental ones, US-only employer duties (program, training, workplace labels), and enforcement: the GHS has none, HazCom does.

This is general guidance, not legal advice. OSHA-approved State Plans may adopt HazCom requirements at least as effective as the federal standard; verify your state's rules.

Related: Complete OSHA HazCom Compliance Guide 2026 · GHS Label Requirements: Complete Guide · How to Read a Safety Data Sheet · HazCom Standard 1910.1200 overview

Sources & verification: 29 CFR 1910.1200 (labels (f), SDS access (g)(8), trade secrets (i), deadlines (j)) and Appendices B & C; construction adoption via 29 CFR 1926.59; HCS 2024 final rule 89 FR 44144; the Jan 15, 2026 four-month extension; penalty maximums per 29 CFR 1903.15(d). Facts verified against the HazComFast regulatory source of truth (hcsDeadlines, ghsClassification, oshaPenalties, standardsCitations), last verified 2026-06-26; the 2012 preamble at 77 FR 17581, 17600 and 17737, 1910.1200(f)(1)-(2) and the CCOHS page on WHMIS and environmental hazards re-read on October 13, 2026. Not legal advice.