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NFPA Hazard Code Ratings

The NFPA 704, or the “hazard diamond”, is the familiar hazard identification system and ratings standard prescribed by the National Fire Protection Agency.

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 WARNINGS (WHITE)
W
-
Water Reactive
Oxy
-
Oxidizing Agent