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)
Level |
Description |
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)
Level |
Description |
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)
Level |
Description |
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)
Level |
Description |
W |
Water Reactive |
Oxy |
Oxidizing Agent |