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The number 4 on the NFPA 704 placard indicates the highest hazard in any of the three categories (health, fire, reactivity).
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NFPA 704 for cyclohexane: 1-3-0
The first guide is from 1960.
0-0-0
The NFPA 704 diamond is a ring of smaller diamonds that are blue, red, yellow and white. A number or symbol in each section indicates the relative danger.
Potential dangers.
Health (blue) 2 Fire (red) 0 Reactivity (yellow) 0
NFPA 704 Hazmat color codes: blue -- health hazard (4 being deadly) red -- fire hazard (4 being flash point below 73 F) yellow -- reactivity (4 may detonate) and white -- specific hazard (no water, radioactive, acid, alkali, corrosive, oxidizer)
Fire Hazard: 2, Red square Special Information: 4 Health hazard: 1 Reactivity hazard: 3
It is the yellow section.
The highest degree of hazard - severe hazard that a very short exposure could cause serious injury or death.