Pictograms 1 - 4

OSHA's first four pictograms are as follows:

1. Flame
2. Flame over Circle
3. Exclamation Mark
4. Exploding Bomb

Each indicates a different class of chemicals.

The Flame pictogram identifies the following chemical classes: flammables, pyrophorics, self-heating, flammable gas emitting, self-reactives, and organic peroxides.

The Flame over Circle pictogram identifies chemicals classified as oxidizers. Oxidizers can either initiate the burning of a fuel or accelerate its burning. Some oxidizers have such a high potential of causing fire that they are not classified as oxidizers but rather as explosives.

The Exclamation Mark pictogram identifies the following classes of chemicals: irritants (skin and eye), skin sensitizers, acute toxicity (the toxic effects resulting from a single dose or short exposure to a substance), narcotic effects, respiratory tract irritant, and hazardous to the ozone layer.

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