The degree of hazard in an NFPA (National Fire Protection Association) label is indicated using a color-coded system with four quadrants, each representing a different type of hazard: health (blue), flammability (red), reactivity (yellow), and specific hazards (white). Each quadrant is numbered from 0 to 4, with 0 indicating no hazard and 4 indicating a severe hazard. The higher the number in each quadrant, the greater the risk associated with the material. This labeling system provides a quick visual reference for emergency responders to assess the hazards of a substance.
The number 4 on the NFPA 704 placard indicates the highest hazard in any of the three categories (health, fire, reactivity).
The highest degree of hazard - severe hazard that a very short exposure could cause serious injury or death.
There are reports that tert-Butyl hydroperoxide has an NFPA 704 rating of 4-4-4, but it is not available in anything over 90 percent concentration, having 2-2-3. If you are ever in a place that needs such stuff, you are strongly urged to find a different job.
Fire Hazard: 2, Red square Special Information: 4 Health hazard: 1 Reactivity hazard: 3
2-0-1-ox
The flammable sign was standardized by the National Fire Protection Association (NFPA) in the late 1940s. The NFPA developed a system of labeling flammable materials with a red diamond symbol to alert people to the fire hazard.
NFPA 704 Hazmat color codes: blue -- health hazard (4 being deadly) red -- fire hazard (4 being flash point below 73 F) yellow -- reactivity (4 may detonate) and white -- specific hazard (no water, radioactive, acid, alkali, corrosive, oxidizer)
300 to 400 degrees per NFPA
The NFPA 704 symbol for acetylene is a blue diamond with a white flame symbol on top, a red health hazard rating of 4 (extreme), a blue flammability rating of 4 (extreme), and a yellow reactivity rating of 0 (stable).
Acetone is assigned a Hazard Guide Number of 30 by the National Fire Protection Association (NFPA). This number indicates the potential health, flammability, and reactivity hazards associated with the substance.
NFPA 1002 is the Standard for Driver Operator Professional Qualifications.
Health (Blue): 1 Flammability (Red): 2 Reactivity (Yellow): 0 Special (White): None