What Are HazCom Pictograms?

Under OSHA’s Hazard Communication Standard (HCS 1910.1200), which aligns with the Globally Harmonized System (GHS), pictograms are visual symbols used to communicate specific chemical hazards. These red diamond icons are required on labels and Safety Data Sheets (SDS) to alert workers quickly and clearly to the nature of the danger.

Understanding and correctly applying these pictograms is essential for compliance and worker protection in any facility using hazardous substances.

GHS Pictograms and Their Meanings

Image

Exploding Bomb

Indicates: Explosives, self-reactive substances, organic peroxides
Example: TNT, benzoyl peroxide

Image 1(1)

Flame

Indicates: Flammable gases, liquids, solids, aerosols; self-heating substances
Example: Acetone, propane
Image 1(1)

Flame Over Circle

Indicates: Oxidizers (liquids, solids, gases)
Example: Hydrogen peroxide, potassium nitrate
Image 1(2)

Gas Cylinder

Indicates: Gases under pressure
Example: Oxygen, nitrogen
Image 1(3)

Corrosion

Indicates: Skin corrosion/burns, eye damage, corrosive to metals
Example: Hydrochloric acid, sodium hydroxide
Image 1(5)

Skull and Crossbones

Indicates: Acute toxicity (fatal or toxic)
Example: Cyanide, arsenic
Image 1(4)

Exclamation Mark

Indicates: Irritation, sensitization, acute toxicity (less severe)
Example: Ammonia, acetone
Image 1(6)

Health Hazard

Indicates: Carcinogenicity, respiratory sensitization, organ toxicity
Example: Benzene, formaldehyde
Image 1(6)

Environment

Indicates: Aquatic toxicity (acute or chronic)
Example: Mercury, nonylphenol

When Must These Pictograms Appear?

  • Labels on shipped hazardous chemical containers
  • Section 2 of Safety Data Sheets (SDS)
  • Workplace container labels (if not exempt)

OSHA vs. DOT Labeling: What’s the Difference?

OSHA (HazCom/GHS)

DOT (Transportation Placards)

Red diamond pictograms

Square placards with class numbers

Required in workplaces

Required in shipping

29 CFR 1910.1200

49 CFR Parts 100–185

Note: DOT labels apply in transit; OSHA pictograms apply in the workplace.

Why GHS Pictograms Matter

  • Compliance: Avoid OSHA citations
  • Safety: Prevent injuries and exposure
  • Training: Support employee awareness

Get Your Free GHS Pictogram Poster

Need a printable poster for your facility or training area?

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FAQs: HazCom Pictograms

Do all chemicals require pictograms?

Yes, unless specifically exempted by OSHA.

Is the environmental pictogram mandatory?

No, but it is recommended for international shipments and general awareness.

What happens if I mislabel a chemical?

OSHA fines, employee injuries, and regulatory delays may result.