What does the yellow section of the NFPA 704M represent?

The yellow section of the NFPA 704M designation system is used to indicate reactivity hazards. This system utilizes a diamond shape divided into four quadrants, each representing a different type of hazard related to materials. The yellow section specifically addresses the potential of a substance to react chemically, which can include violent reactions, explosion conditions, or the potential to release hazardous gases under certain situations.

Understanding reactivity is crucial for safety planning and hazard communication, as it helps inform individuals about the stability of a material and its potential interactions with other substances. For instance, a material tagged with a high reactivity rating in the yellow section might indicate that it can pose serious risks if it comes into contact with water or other chemicals.

The other sections of the NFPA system cover different categories of hazards: health hazards are shown in blue, flammability hazards are indicated by red, and special hazards are represented by an additional symbol within the diamond. This structured approach makes it easier for emergency responders and individuals handling hazardous materials to quickly assess the risks associated with different substances.