NFPA 704
NFPA 704 is the standard behind the fire diamond, the four-section placard that communicates the hazards of a material to emergency responders at a glance. It rates health, flammability, and instability from 0 to 4, plus a special-hazard field.
The diamond has four quadrants: blue for health, red for flammability, and yellow for instability or reactivity, each scored 0 (minimal) to 4 (severe), and a white quadrant for special hazards such as oxidizers or water-reactivity. It is designed for rapid recognition by responders, distinct from the GHS labeling used on containers and safety data sheets under the OSHA Hazard Communication standard. Recording the NFPA 704 rating alongside each chemical in inventory keeps the on-site hazard picture accurate.
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