What type of markings does NFPA 704 use?

NFPA 704 utilizes a numerical and color coding system designed to communicate the hazards associated with materials in terms of their health risks, flammability, and reactivity. This system employs a diamond shape divided into four quadrants, where each quadrant is designated a color that corresponds to a specific type of hazard—blue for health, red for flammability, yellow for reactivity, and white for specific hazards. The numbers within the colored areas indicate the level of risk, with 0 representing no hazard and 4 indicating a severe hazard.

This method allows for quick visual recognition and immediate understanding of the potential dangers posed by hazardous substances, facilitating safer handling and emergency response. The clarity and standardization of this system promote effective communication among firefighters, hazmat teams, and first responders.