According to NFPA 704, what does the red quadrant represent in labeling hazardous chemicals?

In NFPA 704 labeling, the red quadrant specifically represents flammability. This labeling system uses a diamond shape divided into four quadrants, each corresponding to different hazards associated with a chemical. The red section addresses how easily a substance can catch fire. The numbering in this quadrant ranges from 0 to 4, with 0 indicating that the material is not flammable and 4 indicating that the chemical has a very high flammability risk, such as being capable of igniting at normal ambient temperatures. Understanding the significance of the red quadrant is essential for safety in handling and storing hazardous materials, as it provides immediate visual information about fire hazard potential.