Which color on the NFPA 704 Diamond indicates instability hazards?

• A. Blue
• B. Red
• C. Yellow
• D. White

Answer: (C)

The NFPA 704 Diamond is a standardized label used to identify the hazards of materials, specifically designed to quickly communicate information regarding health, flammability, instability, and specific hazards. Each color represents a different type of hazard.

The yellow section of the diamond specifically indicates instability hazards. This can refer to the tendency of a substance to undergo a violent change, such as an explosion or reactive event, when subjected to heat, shock, or pressure. The rating in this section ranges from 0 to 4, with 4 indicating a high degree of instability that could pose serious risks during handling or storage.

Understanding this classification is crucial for first responders and anyone handling hazardous materials, as it helps in assessing the risks associated with the material and determining the appropriate safety measures. The other colors on the diamond signify different hazards: blue for health, red for flammability, and white for specific hazards, which is why they do not pertain to instability.