The first guide is from 1960.
Cyclohexane does not have a specific NFPA diamond classification since it is not considered a hazardous material under the NFPA 704 standard.
240
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.
The number 4 on the NFPA 704 placard indicates the highest hazard in any of the three categories (health, fire, reactivity).
Health (blue) 2 Fire (red) 0 Reactivity (yellow) 0
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.
It is the yellow section.
The NFPA 704 symbol for acetylene is a blue diamond with a white flame symbol on top, a red health hazard rating of 4 (extreme), a blue flammability rating of 4 (extreme), and a yellow reactivity rating of 0 (stable).
The NFPA 704 rating for propane is 2 for health (blue), 4 for flammability (red), and 0 for reactivity (yellow). This indicates that propane poses a high flammability risk, being easily ignitable, but it has low toxicity and is stable under typical conditions. The rating system helps emergency responders quickly assess the hazards associated with propane during incidents.