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The Hazard Communication Standard (HCS) requires pictograms on labels to alert users of the chemical hazards to which they may be exposed. Each pictogram consists of a symbol on a white background framed within a red border and represents a distinct hazard(s).

The pictogram on the label is determined by the chemical hazard classification.

HCS Pictograms and Hazards

Health Hazard

  • Carcinogen
  • Mutagenicity
  • Reproductive Toxicity
  • Respiratory Sensitizer
  • Target Organ Toxicity
  • Aspiration Toxicity


  • Flammables
  • Pyrophorics
  • Self-Heating
  • Emits Flammable Gas
  • Self-Reactives
  • Organic Peroxides

Exclamation Mark

  • Irritant (skin and eye)
  • Skin Sensitizer
  • Acute Toxicity (harmful)
  • Narcotic Effects
  • Respiratory Tract


  • Hazardous to Ozone Layer (Non-Mandatory)

Gas Cylinder

  • Gases Under Pressure


  • Skin Corrosion/Burns
  • Eye Damage
  • Corrosive to Metals

Exploding Bomb

  • Explosives
  • Self-Reactives
  • Organic Peroxides

Flame Over Circle

  • Oxidizers

Environment (Non-Mandatory)

  • Aquatic Toxicity

Skull and Crossbones

  • Acute Toxicity (fatal or toxic)
  • Categorized in:
  • Transportation Safety
  • Driving Techniques
  • Health & Wellness
  • Workplace Safety