The NFPA (National Fire Protection Association) fire diamond is a symbol used to alert first responders to the hazards involved with a given material. The fire diamond is based on standards listed in the NFPA document: “Standard System for the Identification of the Hazards of Materials for Emergency Response” and is designed to be easily understood.

The fire diamond consists of 4 color-coded quadrants:

Red — on the top indicating fire hazard.

Blue — on the left indicating health hazard.

Yellow — on the right indicating chemical instability hazard.

White — on the bottom indicating special hazards.

Fire, health, and instability hazards are rated on a scale from 0 (no hazard) to 4 (severe hazard). Special hazards are listed by symbols specific to the material.