OSHA hazard communication standard pictograms: the complete guide

Last updated 2026-07-09

What is the OSHA hazard communication standard pictogram?

A hazard communication pictogram is a symbol inside a red diamond-shaped border that tells you, at a glance, what category of danger a chemical poses. OSHA adopted these symbols in 2012 when it aligned its Hazard Communication Standard (HazCom) with the United Nations Globally Harmonized System of Classification and Labelling of Chemicals, better known as GHS. The final rule took effect in 2013 and required full compliance on labels and safety data sheets by June 1, 2016 ^[1].

Before GHS, chemical labels were a mess. Different companies used different symbols, different color schemes, and different formats. A worker moving from one job site to another couldn't rely on any consistent visual language. The GHS pictogram system fixed that by creating nine standardized symbols that mean the same thing on a drum in Texas as they do on a barrel in Germany.

The pictogram itself is specific: a black hazard symbol on a white background, inside a red square border rotated 45 degrees to form a diamond. That red border is mandatory on shipped containers under 29 CFR 1910.1200. Workplace labels may use a red border or may substitute other means (like color coding or written text) in certain situations, but the GHS symbols underneath that border are the international standard ^[2].

For small businesses, this matters practically. If any employee handles, stores, or could be exposed to a hazardous chemical, your hazard communication program has to address pictograms in writing and in training. That's not optional.

What are all 9 GHS pictograms and what does each one mean?

OSHA recognizes nine GHS pictograms under 29 CFR 1910.1200 Appendix C. Here's each one, what the symbol looks like, and exactly what it covers.

Pictogram Name	Symbol Description	Hazard Classes Covered
Flame	Flame over a horizontal line	Flammable gases, liquids, solids, aerosols, self-reactives, pyrophorics, self-heating, emits flammable gas, organic peroxides
Flame Over Circle	Flame over a circle	Oxidizers (gases, liquids, solids)
Exploding Bomb	Explosion with debris	Explosives, self-reactives, organic peroxides
Skull and Crossbones	Classic skull over crossed bones	Acute toxicity (fatal or toxic, categories 1-3)
Exclamation Mark	Plain exclamation point	Acute toxicity category 4, skin/eye irritant, skin sensitizer, narcotic effects, respiratory tract irritation, hazardous to ozone layer
Health Hazard	Silhouette of person with starburst on chest	Carcinogen, respiratory sensitizer, reproductive toxin, target organ toxin, mutagen, aspiration hazard
Corrosion	Liquid dripping onto hand and surface	Skin corrosion, eye damage, corrosive to metals
Gas Cylinder	Pressurized cylinder	Gases under pressure (compressed, liquefied, dissolved)
Environment (fish and tree)	Dead fish and dead tree	Aquatic toxicity (not required in the US, but may appear on imported products)

A few things worth knowing about that table. One chemical can carry multiple pictograms. A flammable solvent that also causes cancer shows both the Flame and the Health Hazard. And the Environment pictogram (the fish and tree) is part of the GHS system internationally, but OSHA did not make it mandatory for US chemical labels ^[1]. You'll still see it on products from Canada or the EU, because those countries require it.

The Exclamation Mark is the one people underestimate most. It covers the less severe hazards, including skin sensitizers (chemicals that can trigger occupational asthma or skin allergies with repeated exposure). Never read the exclamation mark as "mild." It means the hazard is real but ranked below the skull-and-crossbones threshold.

The Health Hazard silhouette is the one to take most seriously for long-term workforce health. That starburst-chest symbol means the chemical may cause cancer, damage the liver or kidneys over time, or harm reproductive health. These are the chemicals that create OSHA recordkeeping obligations and sometimes trigger extra exposure monitoring beyond basic HazCom.

What does each pictogram require employers to do?

Recognizing the symbols is step one. What actually changes in your workplace depends on which pictograms appear on your chemicals.

The Flame pictogram triggers fire prevention requirements. Flammable liquids in categories 1-4 require proper storage in flammable-rated cabinets, grounding and bonding for static control, and restrictions on ignition sources nearby. This crosses into 29 CFR 1910.106 territory (flammable liquids standard), so HazCom training alone isn't enough ^[3].

The Skull and Crossbones means you're dealing with acutely toxic materials. Depending on the category, OSHA may require medical surveillance under a substance-specific standard (like 29 CFR 1910.1025 for lead or 29 CFR 1910.1028 for benzene). Check whether your chemical has its own OSHA standard before assuming HazCom covers everything.

The Health Hazard pictogram for carcinogens or reproductive toxins often triggers extra documentation. If a substance appears on OSHA's Z tables (29 CFR 1910, Subpart Z), there may be permissible exposure limits (PELs) you're legally obligated to stay under, plus air monitoring requirements.

The Corrosion pictogram means you need appropriate PPE: at minimum, chemical-resistant gloves and eye protection, often face shields and aprons. Your written HazCom program should specify what PPE matches each corrosive in your inventory.

The Gas Cylinder pictogram requires physical safeguards: cylinders stored upright and chained or strapped to prevent tipping, caps on valves when not in use, and separation of full from empty cylinders. These aren't HazCom requirements specifically, but the pictogram should prompt you to check 29 CFR 1910.101.

For the Exclamation Mark, the most common practical obligation is respiratory protection or ventilation evaluation, especially for skin sensitizers. If a chemical can cause occupational asthma, OSHA expects you to control exposure and prevent sensitization before it happens, rather than hand out respirators after symptoms appear.

Writing all of this down is where most small businesses struggle. A tool like SafetyFolio's safety program generator can help you build the required written HazCom program around the specific chemicals your workers actually handle, rather than starting from a generic template.

How do GHS pictograms appear on chemical labels?

Under 29 CFR 1910.1200(f), every label on a shipped hazardous chemical container has to include six elements: the product identifier, signal word, hazard statement(s), precautionary statement(s), supplier information, and the pictogram(s) ^[2]. The pictograms don't stand alone. They appear alongside a signal word, either "Danger" for more severe hazards or "Warning" for less severe ones.

Here's how the two work together. A flammable liquid category 1 carries "Danger" and the Flame. A flammable liquid category 4 carries "Warning" and no flame pictogram (it gets a different label element instead). The signal word and pictogram together give the full picture of severity.

Label size matters too. OSHA requires that pictograms be displayed with a border, symbol, and background that are clearly visible. For very small containers (like a 1 mL ampoule), there are alternative labeling provisions, but they're narrow exceptions, not a loophole.

Workplace labels, meaning the labels your own employees put on secondary containers they fill from a larger supply, have some flexibility. 29 CFR 1910.1200(f)(6) lets employers use any system that includes the product identifier and words, pictures, or symbols that provide at least general information about the hazards, as long as workers have immediate access to the full SDS ^[2]. Many employers just use the GHS pictograms anyway because it's simpler than training people on a parallel system.

One thing catches businesses over and over. Decanting a chemical from its original container into a squeeze bottle, bucket, or spray bottle creates a workplace container that needs a label. That's one of the most common HazCom citation triggers inspectors find.

Where do pictograms appear on a safety data sheet?

Safety data sheets (SDS) use the same nine GHS pictograms, but you'll find them in Section 2 (Hazard Identification), not spread throughout the document ^[4]. Section 2 is where the SDS lists the hazard classification, the signal word, the hazard statements, precautionary statements, and the pictograms for the substance.

The SDS format under GHS has 16 mandatory sections, and the pictograms in Section 2 should match what's on the label. If they don't, that's a red flag: either the SDS is outdated, the label is wrong, or you've got a counterfeit or mislabeled product. Worth investigating before workers touch the chemical.

For HCl (hydrochloric acid), for example, a properly formatted SDS shows the Corrosion pictogram and the Exclamation Mark in Section 2, matching its corrosive and acute toxicity properties. That's what you should check for when evaluating any SDS in your chemical inventory.

Section 8 of the SDS (Exposure Controls and PPE) flows from the hazard information in Section 2. The pictograms tell you what hazard class you're dealing with. Section 8 tells you the specific controls and PPE required. Teaching your workers to connect these two sections beats making them memorize symbol names.

What does OSHA training on pictograms actually require?

29 CFR 1910.1200(h) requires that employers train employees on hazardous chemicals in their work area before initial assignment and whenever a new hazard is introduced ^[2]. Training has to cover how to read and understand labels and SDS, including the meaning of pictograms.

OSHA doesn't specify a minimum training duration or mandate a particular format. What the standard requires is that training cover: the location and availability of the written HazCom program, hazardous properties of chemicals in the work area, protective measures, and the details of the HazCom standard itself, including label and SDS elements.

For pictograms specifically, workers need to know what each symbol means, more than that symbols exist. A worker who can say "the skull means it can kill you" but can't identify the Health Hazard silhouette is undertrained by any reasonable reading of the standard.

OSHA training requirements don't end at hire. Bring in a new chemical with a pictogram your employees haven't seen before, and that's a training trigger. Document the date, the chemical added, and what training you provided. That documentation is what saves you during an inspection.

For broader safety supervision training that covers HazCom in context, an OSHA 30 course covers hazard communication as part of its general industry or construction curriculum, though it's no substitute for the site-specific chemical training 29 CFR 1910.1200(h) requires.

What OSHA fines apply to pictogram and HazCom violations?

HazCom (including pictogram-related violations) is consistently one of OSHA's most-cited standards. In fiscal year 2023, 29 CFR 1910.1200 ranked among the top five most frequently cited standards in general industry ^[5].

As of 2024, OSHA penalty amounts are:

Violation Type	Maximum Penalty Per Violation
Serious	$15,625
Other-than-Serious	$15,625
Willful or Repeated	$156,259

HazCom violations typically fall under "Serious" when workers are actually exposed to unlabeled or mislabeled hazardous chemicals. A missing pictogram on a container, failure to have an SDS for a chemical in use, or no documentation of pictogram training can each generate a separate citation line.

OSHA does apply penalty reductions for small businesses. Employers with 25 or fewer employees can receive up to a 60% reduction on Serious violations. Employers with 26-100 employees get up to 40% ^[6]. But the base penalty before reduction can still be steep, and repeated violations within three years get the full multiplier.

Four habits prevent most HazCom citations: keep your chemical inventory list current, keep complete SDS files for every chemical, label every container including secondary ones, and document new-hire and refresher training. That's it.

How is the GHS pictogram system different from older OSHA hazard symbols?

Before GHS alignment in 2012, OSHA's HazCom standard (in place since 1983) required chemical manufacturers to warn users about hazards but left the format largely up to them. NFPA's 704 diamond (the colored quadrant system with 0-4 numbers) and HMIS (Hazardous Materials Identification System) labels were common, but they communicated severity ratings rather than specific hazard types. A number 3 in the NFPA blue square tells you about health severity. It doesn't tell you whether the hazard is acute toxicity, a carcinogen, or a skin sensitizer.

GHS pictograms are hazard-type specific. The skull means acute lethality. The health hazard silhouette means chronic or systemic harm. That specificity is more useful for both protective action and training.

NFPA 704 placards are still required in some contexts, particularly for emergency response placarding on buildings under fire codes. They are NOT substitutes for GHS labels and SDSs under 29 CFR 1910.1200. You may need both, depending on your local fire code requirements.

DOT hazmat placards (the large diamonds on trucks and railcars) also look similar to GHS diamonds but follow a different system under 49 CFR. DOT placards use nine hazard classes with number identifiers. GHS pictograms communicate chemical-level hazard properties. A flammable liquid that requires a DOT "Flammable Liquid" placard on a tanker would also need the GHS Flame pictogram on its individual containers. They coexist. Neither replaces the other.

How do you build a compliant written HazCom program around pictograms?

29 CFR 1910.1200(e) requires every employer with hazardous chemicals in the workplace to have a written HazCom program. The program has to describe how the employer will handle labeling, SDS management, and employee training ^[2].

For pictograms specifically, your written program should do at least three things. It should state that all shipped containers will be labeled with GHS elements including pictograms, and that employees are prohibited from removing or defacing labels. It should describe your workplace labeling system for secondary containers, including whether you use GHS pictograms or an alternative system, and if alternative, what training bridges the gap. And it should describe how training covers pictogram meaning for each hazard class in your chemical inventory.

Your chemical inventory list (also required by the standard) should reference the SDS for each chemical. Cross-referencing which pictograms appear for each chemical in your inventory gives you a fast training gap analysis. If your inventory includes chemicals with the Health Hazard silhouette but your training records only document the Flame and Skull symbols, you've got a gap.

The written program also needs to address non-routine tasks (like cleaning out a storage tank) and multi-employer worksites where contractors might bring chemicals you haven't trained your workers on. Those situations are where inspectors dig during walkthroughs.

If writing this from scratch sounds like a weekend project you keep postponing, SafetyFolio's safety program generator walks you through the specific elements OSHA requires and produces a program document built around your actual workplace and chemical inventory.

What pictograms are most commonly misunderstood by workers?

Based on how OSHA structures its enforcement guidance and what training gaps show up repeatedly in inspection findings, a few pictograms cause consistent confusion.

The Health Hazard silhouette is the most underestimated. Workers often assume that if a chemical doesn't have the skull and crossbones, it's not seriously dangerous. The silhouette covers carcinogens and reproductive toxins, which can cause irreversible harm over years of chronic exposure without any acute warning signal like a burning sensation or strong odor. This is the pictogram that most connects to long-term occupational disease.

The Exclamation Mark gets dismissed because it looks like a generic warning. But a skin sensitizer (which carries this mark) can cause a worker to develop a permanent allergy that ends their ability to work in certain industries. Once sensitized, even tiny exposures can trigger reactions. That's career-ending harm from a symbol many workers mentally file under "mild."

The Gas Cylinder surprises people because pressurized gases don't fit neatly into the "toxic" or "flammable" mental model. But a ruptured cylinder becomes a projectile. Even inert gases like nitrogen can displace oxygen and cause rapid asphyxiation in confined spaces. The pictogram's job is to trigger pressure-specific handling practices, not fire or toxicity precautions.

The Flame Over Circle (oxidizer) is underappreciated because many workers confuse it with the plain Flame. Oxidizers accelerate combustion in other materials. A container with this symbol stored near flammable materials is a serious fire risk even if the oxidizer itself isn't flammable.

Good training spends extra time on these four. The skull gets attention naturally. These four need deliberate emphasis.

Does the environment pictogram (fish and tree) apply to US workplaces?

Technically, no. OSHA chose not to require the Environment pictogram (showing a dead fish and dead tree, indicating aquatic toxicity) in the US GHS alignment ^[1]. It's not part of 29 CFR 1910.1200's required label elements.

You'll still see it on products imported from Canada, the European Union, and other countries where it's required by law. If a chemical in your workplace carries this symbol because it was manufactured abroad, you don't need to train workers on it as a regulatory requirement under OSHA, but it doesn't hurt to explain it, especially if workers are confused by a symbol your standard training didn't cover.

For spill response and environmental reporting under EPA regulations (like CERCLA or EPCRA), the substance properties that would trigger the fish-and-tree symbol may well matter. Spills of acutely toxic aquatic chemicals can trigger reporting to the National Response Center under 40 CFR Part 302. That's EPA jurisdiction, not OSHA, but the pictogram is a useful flag that you should check your EPA reporting obligations for that chemical.

The practical rule: if you see the fish-and-tree symbol, check the SDS Section 12 (Ecological Information) and cross-reference the chemical against EPA's list of extremely hazardous substances.

How do pictogram requirements apply to small businesses specifically?

29 CFR 1910.1200 covers virtually all employers with hazardous chemicals, regardless of size. There is no small-business exemption from HazCom. Even a two-person cleaning company using bleach and ammonia-based products is covered.

What's different for small businesses is that the burden of maintaining an SDS library, keeping a written program current, and documenting training falls on whoever owns or manages the business, not a dedicated safety officer. For most small employers, that's the same person running payroll and scheduling.

The practical minimum for a small business is: a written HazCom program that describes your labeling, SDS, and training approach; a current inventory of hazardous chemicals; an SDS for every chemical on that inventory; labels on every container; and training records showing employees received pictogram and label training.

For businesses using common commercial products (cleaning supplies, lubricants, paints), many manufacturers now provide GHS-formatted SDSs and labels automatically. The burden is mostly in organizing and documenting, not in creating hazard assessments from scratch.

For context on how OSHA structures its broader compliance expectations for small employers, the OSHA basics overview helps you understand which standards apply to your size and industry, and how inspections generally proceed.

Frequently asked questions

How many pictograms does OSHA require under the Hazard Communication Standard?

OSHA's Hazard Communication Standard (29 CFR 1910.1200) uses nine GHS pictograms total. Eight are required on US chemical labels where applicable: Flame, Flame Over Circle, Exploding Bomb, Skull and Crossbones, Exclamation Mark, Health Hazard, Corrosion, and Gas Cylinder. The ninth, the Environment pictogram showing a fish and tree, is part of the GHS system internationally but OSHA did not make it mandatory in the United States.

What does the skull and crossbones pictogram mean on a chemical label?

The skull and crossbones indicates acute toxicity in categories 1, 2, or 3, meaning the chemical can cause death or serious injury from a single or short-term exposure through ingestion, skin contact, or inhalation. It's reserved for the most severely toxic substances. Chemicals with lower acute toxicity (category 4) use the Exclamation Mark instead. When you see the skull, your SDS Section 4 (First Aid) and Section 8 (PPE) should be your immediate references.

What is the difference between the Exclamation Mark and the Health Hazard pictogram?

The Exclamation Mark covers acute or less-severe hazards: irritants, skin sensitizers, and low-level acute toxicity (category 4). The Health Hazard silhouette covers chronic or systemic harm: carcinogens, reproductive toxins, respiratory sensitizers, mutagens, and target organ toxins. In plain terms, the Exclamation Mark signals hazards that may affect you now. The Health Hazard silhouette signals hazards that may harm you over time, often without immediate symptoms.

Are GHS pictograms required on secondary containers in the workplace?

Not always. 29 CFR 1910.1200(f)(6) allows employers to use workplace labels that include the product identifier plus words, pictures, or symbols that convey at least the general nature of the hazard. Full GHS pictograms are not strictly required on employer-created workplace labels as long as employees can immediately access the SDS. Many employers use GHS pictograms anyway for simplicity and consistency, which is the approach OSHA clearly prefers.

What OSHA standard covers hazard communication pictograms?

29 CFR 1910.1200 is the standard for general industry. The construction equivalent is 29 CFR 1926.59, which incorporates 1910.1200 by reference. Maritime uses 29 CFR 1915.99. All three adopt the same GHS pictogram requirements. OSHA aligned these standards with GHS in 2012, with full compliance required for labels and SDSs by June 1, 2016.

How do I find what pictograms apply to a specific chemical?

Check the Safety Data Sheet (SDS) for the chemical, specifically Section 2 (Hazard Identification). The SDS must list the GHS classification, signal word, hazard statements, and all applicable pictograms. If you don't have the SDS, request it from your supplier or manufacturer. Under 29 CFR 1910.1200(g), chemical manufacturers must provide an SDS with initial shipments and upon request. OSHA also maintains a free SDS repository search tool on its website.

What training do employees need to understand hazard communication pictograms?

29 CFR 1910.1200(h) requires training before initial assignment and when new hazards are introduced. Training must cover the meaning of each pictogram present on chemicals in the work area, how to read a label, and how to access and interpret SDSs. Workers must understand more than what a symbol looks like. They must understand what it means for their handling, PPE, and emergency response. Training must be documented with employee names, dates, and topics covered.

Can the NFPA 704 diamond replace GHS pictograms on chemical labels?

No. NFPA 704 and GHS labels serve different purposes and one cannot substitute for the other under 29 CFR 1910.1200. NFPA 704 provides severity ratings (0-4) for emergency responders and is typically required on facility placarding under local fire codes. GHS pictograms identify specific hazard types (flammability, acute toxicity, carcinogenicity, etc.) on individual containers. Many facilities use both systems simultaneously to satisfy different regulatory requirements.

How often do OSHA inspectors cite hazard communication violations?

HazCom (29 CFR 1910.1200) ranks consistently among OSHA's top five most-cited standards in general industry, appearing in that top five list every year for over a decade. Common citation items include missing or inadequate labels on containers, missing SDSs, no written HazCom program, and inadequate employee training records. Serious penalties run up to $15,625 per violation as of 2024.

What is the GHS, and how does it relate to OSHA's hazard communication standard?

GHS stands for the Globally Harmonized System of Classification and Labelling of Chemicals, developed by the United Nations. It's an international framework for standardizing how chemical hazards are classified and communicated. OSHA adopted GHS as the basis for its revised HazCom standard in 2012, replacing the previous performance-oriented approach with GHS's specific pictogram symbols, SDS format, and classification criteria. The result is that US labels now use the same symbols as most other countries.

Does the gas cylinder pictogram mean the gas itself is hazardous?

Not necessarily. The Gas Cylinder pictogram applies to any gas stored under pressure, including gases that are otherwise inert, like nitrogen or helium. The hazard is primarily physical: a ruptured or improperly handled cylinder can become a dangerous projectile, and inert gases can displace oxygen in confined spaces and cause asphyxiation. If the gas is also flammable or toxic, it will carry additional pictograms alongside the Gas Cylinder.

What should I do if a chemical label in my workplace is missing a pictogram?

First, pull the SDS for that chemical and confirm what pictograms should appear. If the label is incorrect or incomplete, don't use the chemical until it's properly labeled. Contact the supplier to get a corrected label or replace it yourself using the SDS information. Document the issue and your corrective action. Allowing workers to use an incorrectly labeled container is a citable OSHA violation, and if an injury results, it can factor into OSHA's willfulness analysis.

Is the hazard communication standard the same for construction and general industry?

The requirements are substantively the same. General industry uses 29 CFR 1910.1200, and construction uses 29 CFR 1926.59, which directly incorporates 1910.1200's requirements by reference. Both require written programs, SDSs, proper labeling including GHS pictograms, and employee training. The practical differences relate to the chemical inventory and multi-employer worksite provisions, which are especially relevant in construction where different contractors' chemicals mix on the same site.

What is a signal word and how does it relate to pictograms?

A signal word is either "Danger" or "Warning" and appears on the label alongside the pictogram(s). "Danger" is used for more severe hazard categories within a hazard class; "Warning" is used for less severe categories. For example, a flammable liquid in category 1 uses "Danger" with the Flame pictogram, while a category 3 flammable liquid uses "Warning" with the Flame. The signal word and pictogram together give you a fuller read of severity than either element alone.

Sources

1. OSHA, Hazard Communication Final Rule (2012), Federal Register summary: OSHA aligned HazCom with GHS in 2012; full compliance required by June 1, 2016; Environment pictogram not required in US
2. OSHA, 29 CFR 1910.1200 Hazard Communication Standard (full regulatory text): Label elements including pictograms required under 1910.1200(f); training requirements under 1910.1200(h); written program under 1910.1200(e); workplace label flexibility under 1910.1200(f)(6)
3. OSHA, 29 CFR 1910.106 Flammable Liquids Standard: Flammable liquid storage requirements, including flammable-rated cabinets and ignition source controls
4. OSHA, Top 10 Most Cited Standards FY2023: 29 CFR 1910.1200 (Hazard Communication) consistently among top five most-cited general industry standards in FY2023
5. OSHA, Penalties page (penalty amounts and reductions for small employers): Maximum Serious violation penalty $15,625; maximum Willful/Repeated $156,259; small employer reductions of 60% (1-25 employees) and 40% (26-100 employees)
6. United Nations, Globally Harmonized System of Classification and Labelling of Chemicals (GHS), 10th Revised Edition: Nine GHS pictogram symbols and their corresponding hazard classes as defined in the international GHS framework
7. OSHA, GHS Pictograms and Hazard Classes (Quick Card): Official OSHA reference matching each GHS pictogram to the hazard classes it represents under 29 CFR 1910.1200 Appendix C
8. OSHA, 29 CFR 1910.1200 Appendix C - Allocation of Label Elements: Full list of GHS hazard categories, corresponding pictograms, signal words, and hazard statements required under US HazCom
9. OSHA, 29 CFR 1926.59 Hazard Communication (Construction): Construction HazCom standard incorporates 29 CFR 1910.1200 by reference, applying same pictogram requirements to construction worksites