NFPA 704 Hazard Diamond Explained | Chemical Safety Rating System #3731063 (License: Personal Use)

The image displays the standard NFPA 704 hazard identification diamond used in the United States to communicate risks of hazardous materials. The red quadrant (top) shows a 3 for flammability, blue (left) a 2 for health hazard, yellow (right) a 4 for instability/reactivity, and white (bottom) the "W" symbol indicating water reactivity. Each number corresponds to a severity scale from 0 (minimal) to 4 (severe), guiding first responders and workers in safe handling and emergency procedures.

This image is commonly used on safety data sheets (SDS), chemical containers, storage areas, and emergency response guides to quickly convey hazard levels. It serves users seeking to interpret chemical labeling for compliance, training, or incident response planning.