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.

