Last Updated: 2026-10-27
Answer Capsule: An HMIS label is a stacked color bar label for workplace containers. Blue rates health, red rates flammability, and orange rates physical hazard, each from 0 (minimal) to 4 (severe). The white bar carries a PPE letter code from A through K, or X for consult your supervisor. An asterisk on the blue bar flags a chronic health hazard.
Your new hire is standing at a drum of thinner. The label shows a blue 2, a red 3, an orange 0 and a white bar with the letter H. She asks what she is supposed to wear. If nobody on the floor can answer that in ten seconds, the HMIS label is not doing its job.
That is the gap OSHA inspectors find most often: labels on the containers, but a crew never trained to read them. Under the Hazard Communication Standard, that makes the label worthless on paper too.
This post explains the HMIS label bar by bar. You get the four colors, the 0 to 4 scale, the full PPE letter code list from A through K and X, and what the asterisk means. Brent Hanke at Print Pro AZ prints these labels every week and has seen every way they get misread.
What Is an HMIS Label?
An HMIS label is a workplace container label built on the Hazardous Materials Identification System from the American Coatings Association. It uses horizontal color bars stacked in a fixed order, with a number or letter in each bar.
It is written for the worker at the container, not the firefighter at the door, which is the key difference from the NFPA 704 diamond. If you need the door sign, start with the pillar guide to reading the NFPA 704 diamond.
The HMIS label answers three questions in one glance: how bad is this material, how easily does it burn, and what do I put on before I open it. Print Pro AZ prints the HMIS label with space for the chemical name and the ratings your SDS gives you.
What Do the Four HMIS Label Colors Mean?
The four bars read from top to bottom: blue for health, red for flammability, orange for physical hazard, and white for personal protective equipment.
| Bar | Color | Question it answers | What goes in it |
|---|---|---|---|
| Health | Blue | How badly can this hurt me? | 0 to 4, plus an optional asterisk for chronic effects |
| Flammability | Red | How easily does it burn? | 0 to 4 |
| Physical hazard | Orange (yellow on older labels) | Can it react, explode or pressurize? | 0 to 4 |
| PPE | White | What do I wear? | A letter, A through K, or X |
The three colored bars match the NFPA 704 diamond colors, which is why people mix the two systems up. The white bar is where they split: PPE on HMIS, a special hazard symbol like W, OX or SA on NFPA 704. The full side by side is in HMIS vs NFPA 704 labels.
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How Do You Read the HMIS Numbers 0 to 4?
Every colored bar uses the same scale: 0 is minimal hazard and 4 is severe.
| Number | Health (blue) | Flammability (red) | Physical hazard (orange) |
|---|---|---|---|
| 0 | Minimal hazard | Will not burn under normal conditions | Stable, no reactivity concern |
| 1 | Slight, irritation only | Must be preheated to burn | Normally stable, may react at high heat or pressure |
| 2 | Moderate, temporary or minor injury | Must be moderately heated to ignite | Unstable under heat or pressure, or reacts with water |
| 3 | Serious, major injury possible | Ignites at normal temperatures | May detonate with a strong initiating source |
| 4 | Severe, life threatening | Flammable gas or very low flash point liquid | May detonate at normal temperature and pressure |
The numbers come from the SDS for the exact product you stock. Section 16 often prints the HMIS rating outright. If it does not, the flash point in Section 9 drives the red bar, the toxicity data in Section 11 drives the blue bar, and the stability data in Section 10 drives the orange bar.
Callout: Do not copy a GHS category number into an HMIS bar. GHS Category 1 is the most severe and HMIS 1 is the least severe. A straight copy comes out backwards and puts a 1 on a drum that should carry a 4.
What Do the HMIS PPE Codes A Through K and X Mean?
The white bar carries one letter, and each letter stands for a fixed set of personal protective equipment. Post the key where your crew can see it.
| Code | Required PPE |
|---|---|
| A | Safety glasses |
| B | Safety glasses and gloves |
| C | Safety glasses, gloves and apron |
| D | Face shield, gloves and apron |
| E | Safety glasses, gloves and dust respirator |
| F | Safety glasses, gloves, apron and dust respirator |
| G | Safety glasses, gloves and vapor respirator |
| H | Splash goggles, gloves, apron and vapor respirator |
| I | Safety glasses, gloves, and dust and vapor respirator |
| J | Splash goggles, gloves, apron, and dust and vapor respirator |
| K | Airline hood or mask, gloves, full suit and boots |
| X | Consult your supervisor for special handling instructions |
Back to the new hire at the drum. H means splash goggles, gloves, an apron and a vapor respirator, read straight off the label.
Who picks the letter? You do, as the employer, based on your own PPE hazard assessment under OSHA 29 CFR 1910.132 and the SDS. The supplier may print a suggested code, but the letter on your container has to match what your facility actually requires.
What Does the Asterisk on an HMIS Label Mean?
An asterisk next to the blue health number means the material has a chronic health hazard. That covers effects that build up over repeated or long-term exposure: carcinogens, reproductive toxins, materials that damage organs over time.
The number itself still rates acute exposure, so a 1* is a material that only irritates on contact today but can cause long-term harm.
NFPA 704 has no chronic marker at all, because a firefighter needs to know what a material does in the next twenty minutes, not the next twenty years.
Is an HMIS Label Enough for OSHA HazCom?
Yes, on in-plant containers, if you meet the conditions in OSHA's Hazard Communication Standard. The rule is 29 CFR 1910.1200, and its container labeling requirements are in paragraph (f).
Paragraph (f)(6) allows an alternative workplace labeling system such as HMIS or NFPA 704 on workplace containers in place of the full GHS label. You have to satisfy two conditions:
- Your employees are trained to read the system, and that training is documented.
- The information on the label is consistent with the SDS for that product.
Shipped containers are different. The supplier's GHS label stays on the container as it arrives; HMIS goes on the secondary containers you fill and can supplement the original drum label.
Here is a typical situation Print Pro AZ hears about. A machine shop has HMIS labels on every coolant and solvent container, but half the white bars are blank and none of the workers can say what the letters mean. The fix is not more labels. It is a rating sheet from the SDS, a PPE key on the wall, and fifteen minutes of training.
Where Does an HMIS Label Go, and Where Does It Not?
An HMIS label goes on the container the worker touches: drums, totes, cans, squeeze bottles, spray bottles and the secondary containers your crew fills. It does not go on the door as your fire code sign.
The fire code, IFC Section 5003.5, calls for hazard identification signs as specified in NFPA 704 at entrances and on stationary tanks. An HMIS bar label on the door does not meet that. Post the NFPA 704 diamond for the fire marshal and keep HMIS at the container.
A label on a one-quart bottle needs to be readable in hand; a 55-gallon drum can carry a larger label. Print Pro AZ also stocks NFPA reference charts and container labels so the key is posted on the wall next to the containers.
Partner companies that standardize container labels and train on them report 45%+ better first-time inspection pass rates. The free NFPA 704 Diamond Field Guide includes ratings for 50 common chemicals you can use to fill in the colored bars; use the download form on this page to get it.
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Frequently Asked Questions
What is the difference between HMIS and NFPA labels?
HMIS is for the worker at the container and its white bar is a PPE letter. NFPA 704 is a diamond for emergency responders and its white square holds only the symbols W, OX and SA.
Is HMIS required by OSHA?
No. OSHA requires container labels under 29 CFR 1910.1200, and HMIS is one accepted alternative for in-plant containers under paragraph (f)(6). You must train employees on it and keep it consistent with the SDS.
What does the letter X mean on an HMIS label?
X means consult your supervisor for special handling instructions. The standard codes A through K do not cover the PPE that material needs.
Conclusion
An HMIS label rates health, flammability and physical hazard from 0 to 4 in blue, red and orange bars, and the white bar tells your worker what PPE to put on with a letter from A through K or X. The asterisk flags a chronic health hazard. OSHA accepts HMIS on in-plant containers under 29 CFR 1910.1200(f)(6) when employees are trained and the label matches the SDS.
Labels your crew can actually read save you a citation and keep people out of the eyewash station. Order the HMIS label from Print Pro AZ with your ratings filled in, or call Brent at (602) 649-5305 with your SDS list.
Sources
- OSHA 29 CFR 1910.1200, Hazard Communication
- OSHA Hazard Communication overview
- NFPA 704, Standard System for the Identification of the Hazards of Materials for Emergency Response
Brent Hanke | Print Pro AZ | (602) 649-5305 | b.hanke@printproaz.com
Brent Hanke is the founder of Print Pro AZ, supplying NEC-compliant labels to contractors across the country.