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SESK: Stuff Everyone Should Know · sesk.info/osha-hazcom-flame-over-circle

Which hazard does the flame over circle pictogram warn about?

Oxidizers, chemicals that can feed a fire.

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  1. Flammable liquids
  2. Oxidizers ✔
  3. Explosives

Why: It looks like the flame pictogram, but the circle under the flame means oxidizer. Oxidizers do not have to burn themselves to make a fire worse. Plain flame is for flammables.

Huh, didn't know that: The exploding bomb pictogram covers explosives, self-reactives and organic peroxides.

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What do you call a tooth in a glass of water? A one molar solution.
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References

Answer: Oxidizers. It looks like the flame pictogram, but the circle under the flame means oxidizer. Oxidizers do not have to burn themselves to make a fire worse. Plain flame is for flammables.

  1. OSHA Quick Card: Hazard Communication Standard Pictogram (osha.gov) www.osha.gov/sites/default/files/publications/OSHA3491QuickCardPictogram.pdf
    Flame Over Circle: Oxidizers
    Checked 2026-10-10.

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