PART FOUR: THE WHITE SQUARE The white square – at the bottom of the NFPA diamond – is different from the other three squares. It doesn’t contain a number. Instead, it contains one of three “special hazard” symbols. These are hazards that cannot be defined by the ratings in the other three squares. Materials that…… Continue reading How to Read an NFPA 704 Diamond – Part 4

In One Easy Lesson (In Four Parts) The NFPA Diamond rating system was developed to enable first responders to a fire or similar emergency to see at a glance what hazards they might encounter while performing their duties. It didn’t take long for employers and chemical workers to realize that the Diamond was a useful…… Continue reading How to Read an NFPA 704 Diamond