Hazardous Materials Awareness Army 74D Practice Test

The most important idea here is how the NFPA 704 diamond communicates hazards at a quick glance. The diagram uses three colored fields plus a white field. Each colored field carries a number from 0 to 4 that represents the level of hazard: blue is health, red is flammability, and yellow is reactivity. The higher the number, the greater the hazard in that category. The white section is for special hazards and can show symbols indicating things like oxidizers or water reactivity. So, what you see at a glance are the three hazard ratings and any special hazard symbols. You don’t get packaging or shipping information from the NFPA 704 diamond, nor does it list inhibitors. That’s why the at-a-glance information best described is the health, flammability, and reactivity hazards with a white section for special hazards.