What does the white quadrant of the NFPA 704 label represent?

The NFPA 704 label is a system used for identifying the hazards of particular materials. It employs a color-coded design to communicate information effectively. The white quadrant specifically signifies "Special Information." This quadrant is used to convey specific hazards that may not be covered by the other three quadrants, which represent flammability, health, and reactivity.

For example, in the white section, you might find symbols indicating radiation hazards, acid hazards, or any other specific risks associated with the substance that are important for emergency responders to know. This is essential for safety protocols, as it ensures that individuals handling the material are aware of any additional risks beyond the general categories of health, flammability, and reactivity. By having this designated area, the NFPA system enhances communication about the unique hazards involved with the material, thereby improving safety during handling and emergency response.