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 |
E-mail to Environmental Health and Safety Department: lpowell@linfield.edu