NFPA 704 diamonds indicate hazards in which categories?

NFPA 704 diamonds indicate hazards in which categories?

• A. Toxicity, Solubility, Volatility, and Color.
• B. Health, Flammability, Reactivity, and Special Hazards.
• C. Corrosion, Odor, Viscosity, and Density.
• D. Pressure, Temperature, Humidity, and Exposure.

Answer: (B)

NFPA 704 diamonds convey four kinds of hazards: health risk, flammability, reactivity (instability), and special hazards. The blue quadrant indicates health effects, the red quadrant shows how easily it ignites, the yellow quadrant flags chemical reactivity or instability, and the white quadrant communicates any special hazards (like oxidizers, water reactivity, or simple asphyxiants). This combination—Health, Flammability, Reactivity, and Special Hazards—is exactly what the system is designed to communicate, while properties like toxicity, solubility, or basic physical properties (viscosity, density) aren’t part of the NFPA 704 signaling.