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Chemicals Hazard Rating System

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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
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.

use no water
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.
Capable of detonation or explosion by heat, shock or water.
Dangerous: exposure to this substance would be hazardous to health. Flash Point Below 200 F
Moderately heated conditions may ignite this substance.
Violent chemicals changes are possible at normal temperatures or pressures or when mixed with water.
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.
No significant hazard or health risk. Will Not Burn. Stable
Substances remain stable with heat, pressure and with water.
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