The NFPA 704M System
This is a standardised system that uses numbers and primary colours on a label to define the basic hazards of a specific material.
The system uses a 4-clour diamond to indicate the type of hazard: blue (health), red (flammability), yellow (reactivity) and white (special hazards). These are rated on a scale of 0 (no hazard) to 4 (extreme hazard). The ratings for individual substances can be found in the NFPA Fire Protection Guide to Hazardous Materials.
The NFPA 740M, also known as the "fire diamond", is most commonly found on bulk storage containers (tanks and bins), but it is also widely used on drums, on all sizes of containers, and as signage for areas.
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