NFPA Chemical Hazard Labels

The National Fire Protection Association (NFPA) has developed a system for indicating the health, flammability and reactivity hazards of chemicals. In addition, a special precaution symbol may be used where necessary.

Scroll down the page for general information on the NFPA diamond labeling symbol.

Rating Summary

Health (Blue)

4 Danger	May be fatal on short exposure. Specialized protective equipment required
3 Warning	Corrosive or toxic. Avoid skin contact or inhalation
2 Warning	May be harmful if inhaled or absorbed
1 Caution	May be irritating
0 No unusual hazard

Flammability (Red)

4 Danger	Flammable gas or extremely flammable liquid
3 Warning	Flammable liquid flash point below 100° F
2 Caution	Combustible liquid flash point of 100° to 200° F
1 Combustible if heated
0 Not combustible

Reactivity (Yellow)

4 Danger	Explosive material at room temperature
3 Danger	May be explosive if shocked, heated under confinement or mixed with water
2 Warning	Unstable or may react violently if mixed with water
1 Caution	May react if heated or mixed with water but not violently
0 Stable	Not reactive when mixed with water

Special Notice (White)

W	Water Reactive
Oxy	Oxidizing Agent

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