In the NFPA 704, what does a rating of 0 indicate?

In the NFPA 704 labeling system, which is used to identify hazards associated with materials, a rating of 0 signifies that there is no hazard present. This means that the material poses no risk to health, flammability, or reactivity under standard conditions. The NFPA 704 system employs a color-coded diamond shape, where each quadrant represents a specific type of hazard. A rating of 0 indicates that the substance is safe to handle and does not require any special precautions when it is being stored or used.

The other ratings indicate varying degrees of risk, with higher numbers representing greater levels of hazard. For example, a rating of 1 indicates a slight hazard, while ratings of 2, 3, and 4 correspond to moderate, severe, and extreme hazards, respectively. Understanding these ratings is crucial for ensuring safety in environments where hazardous materials are present.