Chemical hazard labels must comply with OSHA 29 CFR 1910.1200 (the Hazard Communication Standard) and the Globally Harmonized System (GHS). Every compliant label requires six elements: a product identifier, signal word, hazard statements, precautionary statements, pictogram(s), and supplier information. OSHA's 2024 HazCom update—aligning with GHS Revision 7—brings new labeling requirements with phased compliance deadlines that affect manufacturers, distributors, and employers.
Your crew handles chemicals every day — solvents, adhesives, cleaners, corrosives. If any container is missing a compliant GHS label, you're looking at an OSHA citation and a recordable safety incident before the job is done. OSHA's Hazard Communication Standard (HazCom) has required GHS-aligned chemical hazard labels since 2012. The 2024 update raises the bar again, aligning with GHS Revision 7. This guide covers every element your chemical hazard labels must include, how to identify the right pictograms, and what the updated compliance timeline means for your facility.
What Is a GHS Chemical Hazard Label?
A GHS chemical hazard label is the standardized warning label required on every hazardous chemical container — from drums in a warehouse to bottles on a job site. GHS stands for the Globally Harmonized System of Classification and Labelling of Chemicals, an international framework developed by the United Nations. OSHA incorporated GHS into US law through 29 CFR 1910.1200, the Hazard Communication Standard.
The label communicates hazard information in a consistent format so that workers can immediately identify the dangers of a chemical, the severity of those dangers, and what protective actions to take.
Before HazCom 2012 adopted GHS, US labels were inconsistent — the same chemical might carry a different format from supplier to supplier. GHS ended that. Now every label in the US must follow the same six-element structure.
What Are the 6 Required Elements on a Chemical Hazard Label?
Every chemical hazard label regulated under OSHA 29 CFR 1910.1200 must include all six of these elements:
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Product Identifier — The name, code number, or batch number that matches the Safety Data Sheet (SDS). This links the label to the full hazard information.
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Signal Word — Either "DANGER" (for more severe hazards) or "WARNING" (for less severe). Only one signal word appears per label. If a chemical triggers both, "DANGER" takes precedence.
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Hazard Statement(s) — Standardized phrases describing the nature of the hazard (e.g., "Flammable liquid and vapor" or "Causes serious eye damage"). These are assigned by hazard category, not written freely.
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Precautionary Statement(s) — What to do to minimize exposure or what to do in an emergency (e.g., "Keep away from heat, sparks, open flames" or "Wear protective gloves/eye protection").
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Pictogram(s) — The GHS hazard pictograms inside a red diamond border. A label may carry multiple pictograms if the chemical has multiple hazard classes.
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Supplier Identification — The name, address, and phone number of the manufacturer, importer, or responsible party.
Critical rule: All six elements are required. Omitting any one of them — even the phone number — constitutes a non-compliant label under OSHA 1910.1200(f).
Labels must also use durable materials that remain legible throughout the life of the container. Solvent-resistant inks and UV-stable substrates are not just recommended — they're required for any outdoor or chemical-exposure environment.
What Are the 9 GHS Pictograms and When Does Each One Apply?
GHS uses nine standardized pictograms — black symbols on a white background inside a red diamond border. Each maps to one or more hazard classes. Here's what each one signals:
| Pictogram | Hazard Class | When You See It |
|---|---|---|
| Flame | Flammable liquids, solids, gases | Solvents, aerosols, fuels |
| Flame Over Circle | Oxidizers | Bleaches, hydrogen peroxide, nitrates |
| Exploding Bomb | Explosives, self-reactives | High-pressure products, unstable compounds |
| Skull and Crossbones | Acute toxicity (high severity) | Strong acids, concentrated pesticides |
| Exclamation Mark | Irritants, skin sensitizers (less severe) | Cleaning products, mild acids |
| Corrosion | Corrosives (skin/eye/metal) | Battery acid, drain cleaners |
| Gas Cylinder | Gases under pressure | Compressed air, refrigerants, propane |
| Health Hazard | Carcinogens, reproductive hazards, organ toxins | Solvents, asbestos-containing products |
| Environment | Aquatic hazards | Chemicals harmful to waterways |
A single label can carry multiple pictograms when a chemical falls into multiple hazard categories. If a chemical is both flammable and acutely toxic, both the flame and skull pictograms appear.
Installer note: On a job site, you'll most commonly encounter the Flame, Exclamation Mark, Corrosion, and Gas Cylinder pictograms. Any chemical triggering the Skull or Health Hazard pictogram requires special handling and engineering controls — check the SDS before use.
What's the Difference Between the "Danger" and "Warning" Signal Words?
The signal word tells your crew how serious the hazard is at a glance — before they read another word on the label.
DANGER = Severe hazard. This is used for chemicals in the most hazardous category within a hazard class. A "DANGER" label means the chemical can cause serious injury or death under foreseeable conditions of misuse.
WARNING = Moderate hazard. This applies to less severe categories within the same hazard class. Still hazardous — but the risk of serious irreversible harm at typical exposure levels is lower.
Here's a practical example: Concentrated hydrochloric acid carries "DANGER" because it causes immediate, severe skin and respiratory damage. A diluted cleaning solution with the same base chemical at low concentration may carry "WARNING."
One rule that trips people up: If a chemical has multiple hazard classes — one triggering "DANGER" and one triggering "WARNING" — only "DANGER" appears on the label. The more severe signal word always wins.
This distinction matters for PPE decisions. A "DANGER" label should immediately trigger your highest level of protective equipment and your site's emergency response protocols.
What Did OSHA's 2024 HazCom Update Change?
OSHA published the final HazCom 2024 rule to align the US Hazard Communication Standard with GHS Revision 7 (the 7th revised edition). Here's what changed for chemical hazard labels:
New and updated hazard categories: GHS Rev 7 added or revised several hazard classifications — including desensitized explosives, non-flammable aerosols, and updated skin sensitization categories. Chemicals that weren't previously labeled for certain hazards may now require labeling.
Revised precautionary statements: Many standardized precautionary statements were updated for clarity and precision. Existing labels may need updated language even if the underlying chemical hasn't changed.
Updated SDS alignment: Safety Data Sheets must match the revised GHS Rev 7 format. If your SDS changes, your label must stay consistent with it.
Small containers: HazCom 2024 updated provisions for very small containers where fitting all six elements is physically impractical — with specific pull-out or fold-out label exceptions.
Compliance timeline: OSHA set phased deadlines for different stakeholders. Chemical manufacturers and importers were first in line, followed by distributors, with employers receiving the longest runway. Current enforcement dates have been subject to OSHA guidance updates — check OSHA's HazCom compliance page{:target="_blank"} for the most current deadlines before ordering new labels.
What this means for your facility: If you're using pre-2024 label stock for chemicals covered by revised GHS Rev 7 categories, audit your inventory now. Labels that were compliant under HazCom 2012 may not meet HazCom 2024 standards.
What Are Your Workplace Labeling Obligations as an Employer?
OSHA 29 CFR 1910.1200(f)(6) sets specific rules for workplace labels — containers that have been transferred from the original supplier container to a secondary container at your facility.
What you're required to do:
- Keep the original label on any container received from a supplier
- Label any secondary container you fill from the original with either: (a) a copy of the original GHS label, or (b) a workplace label that includes the product identifier and words, pictures, or symbols that provide at least general information regarding the hazards
- Never remove or deface an original label unless the container is immediately refilled and relabeled
Where employers get cited most often:
Here's a scenario Print Pro AZ hears regularly: A maintenance tech fills a spray bottle from a five-gallon drum of industrial degreaser. The spray bottle goes unlabeled. An OSHA inspector walks through — that's a willful violation waiting to happen, especially if the degreaser carries a "DANGER" signal word.
Pipes and process lines are different: Pipes carrying chemicals through a facility fall under ASME A13.1 pipe marker standards, not HazCom label requirements. But both systems need to be in place. If your facility uses chemical process piping, pipe and duct markers handle that compliance layer separately.
Training requirement: Employers must train workers on how to read GHS labels and interpret pictograms. Label compliance and worker understanding are both audited.
How Long Must a Chemical Hazard Label Last?
A GHS label must remain legible and attached for the life of the container. That seems simple — but it's where many facilities fall short.
Common failure points:
- Solvent exposure: Label adhesives dissolve when chemical containers sweat or are handled with wet gloves. Use solvent-resistant label materials for any chemical that produces condensation or contacts solvents.
- UV degradation: Outdoor chemical storage (job sites, tank yards, loading docks) destroys standard paper labels in weeks. UV-stable polyester or aluminum labels are required for outdoor applications.
- Abrasion: Labels on drums that are stacked, dragged, or handled with forklifts need abrasion-resistant overlaminates to stay readable.
- Temperature cycling: High-temp environments (near ovens, boilers, process equipment) require labels rated for thermal extremes.
Print Pro AZ produces custom GHS-compliant labels on materials matched to the specific environment — solvent-resistant, UV-stable, and built to last the full container lifecycle. Custom orders are available for single SKUs or full facility labeling programs.
For commercial facilities needing labels across multiple chemical categories, submit your list through our Commercial Jobs page and we'll spec the right materials for your environment.
Frequently Asked Questions
Does OSHA's HazCom standard apply to all chemicals in my facility?
HazCom applies to any chemical that presents a physical hazard (flammable, explosive, oxidizer) or a health hazard (toxic, carcinogen, irritant, corrosive) in the workplace. Household consumer products used in the same way and duration as a consumer would use them are generally exempt. Articles (solid objects that don't release hazardous chemicals under normal use) are also exempt. When in doubt, check the Safety Data Sheet — if an SDS exists, HazCom labeling applies.
Can secondary containers be labeled differently than the original supplier label?
Yes. OSHA 29 CFR 1910.1200(f)(6) allows employers to use a workplace label on secondary containers instead of a full GHS label, as long as it includes the product identifier and sufficient hazard information for the worker. However, the label must never be less informative than what a worker needs to protect themselves. If the chemical is acutely toxic, the workplace label must communicate that clearly.
What is the difference between HazCom 2012 and HazCom 2024?
HazCom 2012 aligned the US with GHS Revision 3. HazCom 2024 updates alignment to GHS Revision 7. The core six-element label structure stays the same, but specific hazard categories, classification criteria, and precautionary statements have been updated. Some chemicals will shift hazard categories. Some pictogram combinations will change. The Safety Data Sheet format also has minor updates in HazCom 2024.
What happens if OSHA finds a missing or non-compliant chemical hazard label?
OSHA can cite violations under 29 CFR 1910.1200 as either other-than-serious, serious, or willful depending on the circumstances. Willful violations (where the employer knew the requirement and ignored it) carry penalties up to $161,323 per violation as of 2025. Missing labels on acutely hazardous chemicals typically receive serious citations. Repeat violations are treated more harshly. Beyond fines, a worker injury linked to a mislabeled chemical significantly increases legal exposure.
Do chemical hazard labels need to be printed in color?
GHS pictograms must use a red diamond border with a black symbol on a white background. The signal word (DANGER or WARNING) must be printed in a way that is clearly distinguishable — bold text is standard. OSHA does not mandate full-color printing for the text portions, but the pictogram color specification is fixed. Black-and-white pictograms without the red border do not meet GHS requirements.
For OSHA electrical safety requirements, see our guide to OSHA lockout/tagout labels for electrical equipment.
Get Your Chemical Hazard Labels Right the First Time
GHS compliance comes down to six elements, nine pictograms, and materials that hold up in your specific environment. HazCom 2024 tightened the requirements — and OSHA's inspection focus on workplace labels means there's no longer any margin for "close enough."
Use the correct signal word. Verify every pictogram against the SDS. Spec label materials for your environment — outdoor storage, solvent exposure, high temperature, or all three. And if you're transitioning to HazCom 2024-compliant labels across a facility, do it systematically before the next compliance deadline.
Print Pro AZ produces GHS-compliant chemical hazard labels built to last — on polyester, vinyl, or aluminum substrates matched to your application. Order custom chemical hazard labels or contact us for a commercial facility quote.
Questions? Call Brent directly: (602) 649-5305
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.