Historical QOD 1/13/09: Describe what is referred to by each color in the 4 color-coded diamond National Fire Protection Association (NFPA) 704 system placard for hazardous materials information.
Red refers to flammability, blue refers to health hazard, yellow refers to chemical reactivity, and white refers to other miscellaneous information, such as radioactivity, biological hazards, oxidizing agents, corrosives, etc.
National Fire Protection Association (NFPA) Technical Committee on Hazardous Materials Response Personnel: NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response, Quincy, MA, NFPA, 2007
Contributed by: M Greenberg
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