Chloroform is typically classified with the NFPA 704 diamond rating of 2-4-0. This signifies a health hazard of 2, a flammability rating of 4, and no specific reactivity hazards.
Health (Blue): 1 Flammability (Red): 2 Reactivity (Yellow): 0 Special (White): None
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).
Cyclohexane does not have a specific NFPA diamond classification since it is not considered a hazardous material under the NFPA 704 standard.
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The first guide is from 1960.
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.
No, there is no specific chemical with all 4s on its NFPA hazard label. The NFPA 704 standard rates chemicals on a scale of 0 to 4 for health, flammability, and reactivity hazards, but it is unlikely for a single chemical to receive all 4s due to the nature of its properties.
The number 4 on the NFPA 704 placard indicates the highest hazard in any of the three categories (health, fire, reactivity).
If an NFPA 704 Fire Diamond has a 2 in the yellow section it means the reactivity of the material is such that it can have violent chemical change at high temperature or pressure, it can react violently with water, or it can form explosive mixtures with water.
Fire Hazard: 2, Red square Special Information: 4 Health hazard: 1 Reactivity hazard: 3