What does the yellow section of an NFPA label represent?

The yellow section of an NFPA (National Fire Protection Association) label specifically represents the reactive hazard associated with a substance. This section is used to indicate the potential risks posed by the chemical when it comes into contact with other substances or under certain physical conditions.

The numbers used in the yellow section range from 0 to 4, with higher numbers denoting greater levels of reactivity. For example, a rating of 4 indicates that the material is explosive or may undergo violent chemical change, while a rating of 0 suggests that the material is stable and not reactive under standard conditions. This information is critical for emergency responders, as it helps them assess the safety measures necessary when dealing with hazardous materials during incidents or spills.

Understanding the reactive hazards is essential for ensuring safe handling and storage of chemicals, as well as for devising appropriate responses in emergencies involving these materials.