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NFPA’s Hazard Rating Diamond

NFPA’s Hazard Rating Diamond

NFPA’s Hazard Rating Diamond


By:  Ron Parker STS, CHST


The National Fire Prevention Association (NFPA) developed a rating system to identify and rank the hazards of a material.  If you have previously worked in construction you’ve probably seen the colorful labels used to explain these hazards.  The label is diamond-shaped, made up of four smaller diamonds.  The colors are blue, red, yellow and white.  Inside the colored smaller diamonds are numbers or symbols loaded with a wealth of knowledge.


Many people take one look at these labels and assume either it is too complicated for them to understand or they assume it is not important.  Both assumptions are wrong.  So what do these colors mean?  Let’s go through the meanings.
The blue diamond, appearing on the left side of the label, conveys HEALTH HAZARD information for persons exposed to the material.  A number from 0 to 4 is written in the blue diamond.  Remember, the higher the number inside the diamond, the higher the hazard, as follows:

The red diamond, appearing at the top of the label, conveys FLAMMABILITY HAZARD information.  Again, the numbers 0 to 4 are used to rate the flammability hazard, as follows:

The yellow diamond, appearing at the right side of the label, conveys REACTIVITY ( or stability ) information.  Again the o to 4 numbers are used to rank reactivity hazards, as follows:

The white diamond, appearing at the bottom of the label, conveys SPECIAL HAZARD information.  This information is conveyed by use of symbols that represent the special hazard..  Two of the most common symbols are as follows:

To determine the NFPA hazard rating for a material that does not have the label affixed, check the safety data sheet (formerly called material safety data sheet prior to the globally harmonized system being initiated). 
Follow the warnings on the NFPA label or any label affixed to a container or material.  Your safety and the safety of others working around you may depend on your knowledge of the NFPA label.

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