NFPA 704 Hazard Diamond Explained | Health, Flammability, Reactivity Ratings #1207186 (License: Personal Use)

The NFPA 704 diamond displays hazard ratings on a scale of 0-4: blue (health) = 3 means short exposure can cause temporary incapacitation or residual injury; red (flammability) = 3 indicates liquids with flash points between 100°F-200°F; yellow (instability) = 2 means violent chemical change possible under high temperature/pressure; white quadrant shows “W” for water-reactive substances that release hazardous gases when wet. This standardized system helps emergency responders quickly assess risks during incidents.

Used on chemical containers, storage areas, and facility signage to communicate hazard levels to firefighters, hazmat teams, and safety personnel; matches user intent for regulatory compliance, workplace safety training, or emergency response planning.