NFPA 704 Hazard Diamond Explained | Safety Symbol Guide #2218563 (License: Personal Use)

This standardized diamond-shaped symbol, defined by the National Fire Protection Association (NFPA) in standard 704, conveys critical safety information about hazardous materials. Each quadrant-red (flammability), blue (health hazard), yellow (reactivity), and white (special hazards like oxidizers or water reactivity)-uses a numbered scale from 0 to 4 to indicate severity. It is widely deployed on chemical containers, storage areas, and emergency response signage.

Used on chemical labels, safety data sheets, facility entrances, and emergency response guides; supports quick hazard assessment by firefighters, lab personnel, and safety officers during incidents or routine handling.