What aspect does the NFPA 704 yellow section evaluate?

The NFPA 704 yellow section specifically evaluates reactivity hazards associated with chemicals. In this system, each color section represents different types of hazards, and the yellow section focuses on the potential of a substance to undergo violent chemical reactions. This includes how a material may react with water, how it may polymerize, and the overall stability of the material under various conditions.

Understanding the reactivity of a substance is essential for hazard communication and safety planning, particularly in situations like emergencies where the material could pose a risk to responders or the surrounding environment. Therefore, the emphasis in the yellow section reflects the importance of recognizing how materials may behave under various circumstances to mitigate risks effectively.