How to Read an NFPA 704 Diamond – Part 4
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