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Chemicals Hazard Rating System

The National Fire Protection Association (NFPA) hazard system for chemical materials.

The National Fire Protection Association (NFPA) has developed a system for indicating the health, flammability, reactivity and special hazards for many common chemicals through use of the NFPA 704 Diamond.

Chemicals Hazard Rating System
RATINGSHEALTHFLAMMABILITYREACTIVITYSPECIAL
4
SEVERE		 Deadly, even the slightest exposure to this substance would be life threatening. Flash Point Below 73 F
This substance is extremely flammable, volatile and explosive.		 May Detonate
Substances may explode at normal temperatures and pressures.		 SPECIFIC HAZARD

Radiation
Acid
alkali
corrosive
oxidizer
use no water
3
SERIOUS		 Extreme Danger: serious injury would result from exposure to this substance. Flash Point Below 100 F
Flammable, volatile or explosive at normal temperatures and pressure.		 Explosive
Capable of detonation or explosion by heat, shock or water.
2
MODERATE		 Dangerous: exposure to this substance would be hazardous to health. Flash Point Below 200 F
Moderately heated conditions may ignite this substance.		 Unstable
Violent chemicals changes are possible at normal temperatures or pressures or when mixed with water.
1
SLIGHT		 Irritation or minor injury would result from exposure to this substance. Flash Point Above 200
Substance must be preheated to ignite.		 Normally Stable
Substances which may become unstable at elevated temperatures or pressures or with water.
O
MINIMAL		 No significant hazard or health risk. Will Not Burn. Stable
Substances remain stable with heat, pressure and with water.

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