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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.
Cyclohexane does not have a specific NFPA diamond classification since it is not considered a hazardous material under the NFPA 704 standard.
The first guide is from 1960.
0-0-0
The number 4 on the NFPA 704 placard indicates the highest hazard in any of the three categories (health, fire, reactivity).
Potential dangers.
In the NFPA 704 system, the "No Water" symbol is represented by a white circle with a diagonal line through it, which typically appears in the blue section of the diamond. This symbol indicates that water should not be used on the material in question during firefighting efforts. You can find this symbol on the NFPA 704 placard, often displayed on hazardous materials to inform first responders of the appropriate safety measures.
A "4" in the blue quadrant of NFPA 704 indicates that the substance is known to be highly hazardous to an individual's health. The scale runs from 0 to 4 with 0 being essentially harmless and 4 being extremely harmful or potentially fatal. The number 4 means it is too dangerous to enter the liquid or vapor, as compared with number 3, which means you can work with it if you are fully protected.
Health (blue) 2 Fire (red) 0 Reactivity (yellow) 0
No. 704 is a composite number.
Fire Hazard: 2, Red square Special Information: 4 Health hazard: 1 Reactivity hazard: 3
There are reports that tert-Butyl hydroperoxide has an NFPA 704 rating of 4-4-4, but it is not available in anything over 90 percent concentration, having 2-2-3. If you are ever in a place that needs such stuff, you are strongly urged to find a different job.