The yellow portion of the NFPA diamond provides information on:

The yellow portion of the NFPA (National Fire Protection Association) diamond specifically indicates reactivity hazards. This section of the diamond assesses how the material will react under specific conditions, helping to identify substances that may be unstable, explosive, or reactive when exposed to heat, pressure, or other substances. Understanding the reactivity of materials is critical for ensuring safe handling, storage, and response procedures, particularly in environments where chemical reactions could pose significant risks to workers and safety personnel. Identifying these hazards allows for the implementation of appropriate safety measures to mitigate potential dangers associated with reactive materials.