Direct comparison
HMIS vs. NFPA 704 vs. GHS Labels
HMIS, NFPA 704, and GHS labels can all sit on the same lab shelf. Compare what each communicates, who reads it, and which one satisfies HazCom.
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How do HMIS, NFPA 704, GHS compare side by side?
The table below compares HMIS, NFPA 704, GHS across 9 procurement-relevant dimensions, from what it communicates through does it satisfy hazcom secondary-container labelling on its own?.
Side-by-side comparison
| Dimension | HMIS | NFPA 704 | GHS |
|---|---|---|---|
| What it communicates | Workplace hazard severity for a container at the point of use, plus a PPE code for handling it. | At-a-glance severity for emergency responders approaching a building or storage area. | Full hazard classification for the specific substance/mixture: pictograms, signal word, hazard and precautionary statements. |
| Primary audience | Workers handling the container day to day. | Firefighters and emergency responders, not the worker at the bench. | Anyone handling, transporting, or making PPE/first-aid decisions about the substance. |
| Visual format | Horizontal colour bars (blue, red, orange, white), each carrying a 0-4 number; the white bar carries a letter PPE code (A-K) instead of a number. | Four-colour diamond (blue, red, yellow, white); three quadrants carry a 0-4 number, the white quadrant carries OX / W / SA symbols or nothing. | Black pictograms inside a red diamond border on a white background (up to 9 possible), a signal word (Danger or Warning), and full hazard/precautionary statement text. |
| Numeric scale direction | 0 = least severe, 4 = most severe — same direction as NFPA 704, which is exactly why the two get confused. | 0 = least severe, 4 = most severe. | Category 1 = most severe within a hazard class, higher numbers = less severe — the opposite direction, and categories aren't comparable across hazard classes. |
| What the "white" section means | A lettered PPE code telling the worker what protective equipment to put on before handling the container. | Special-hazard symbols: OX (oxidizer), W with a strikethrough (water-reactive), SA (simple asphyxiant gas). | No separate white section — the pictogram itself is the hazard symbol, printed on a white background inside the red diamond border. |
| Legal status in the US | Proprietary and voluntary. No US regulation requires or references it. | A consensus standard. Mandatory only where a local fire code, state adoption, or another referencing code requires it. | Legally required by OSHA's Hazard Communication Standard, 29 CFR 1910.1200, for shipped-container labels and SDSs. |
| Who publishes/maintains it | American Coatings Association (originally the National Paint and Coatings Association); current version is HMIS III. | National Fire Protection Association. | United Nations (the "Purple Book"); implemented in the US by OSHA. |
| Where you'll actually see it in a lab | Secondary container labels applied at the bench; some internal workplace signage. | Building exteriors, storage-area doors, tank markings — placards meant to be read from outside. | The manufacturer's shipped-container label, and Sections 2 and 16 of the safety data sheet. |
| Does it satisfy HazCom secondary-container labelling on its own? | No. A colour-bar-and-number code alone doesn't convey the specific hazards the way OSHA's workplace-labelling alternative (29 CFR 1910.1200(f)(6)) requires — it has to be paired with that information, not substituted for it. | No, for the same reason — it's an emergency-responder aid, not a worker-facing hazard communication label. | Yes. GHS pictograms, signal words, and hazard statements are what HazCom's labelling requirement is built on. |
Common questions
Common questions about HMIS vs NFPA 704 vs GHS
Can an HMIS label replace a GHS label on a secondary container?
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No. OSHA's workplace-labelling alternative under 29 CFR 1910.1200(f)(6) still requires words, pictures, or symbols that convey the specific hazards and necessary protective measures. An HMIS bar's colour-and-number code alone doesn't meet that on its own — most labs that still use HMIS pair it with GHS pictograms rather than substituting one for the other.
Why would the same lab building show all three systems at once?
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Because each serves a different moment. GHS labels and SDSs govern day-to-day handling and are what HazCom actually requires. An NFPA 704 diamond on a storage-room door or building exterior helps a firefighter size up the hazard before entry. HMIS bars on secondary containers are, where they still appear, usually an internal workplace shorthand carried over from before the US fully adopted GHS.
Do the 0-4 numbers mean the same thing in HMIS and NFPA 704?
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They run the same direction — 0 is least severe, 4 is most severe — but they're assigned under different criteria for different purposes. An HMIS health rating reflects sustained workplace exposure; an NFPA 704 health rating is calibrated for a single acute exposure during an emergency response. Don't assume a "3" on one system equals a "3" on the other.
Going deeper
