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 number 4 on the NFPA 704 placard indicates the highest hazard in any of the three categories (health, fire, reactivity).
240
The first guide is from 1960.
Health (blue) 2 Fire (red) 0 Reactivity (yellow) 0
0-0-0
Health (Blue): 1 Flammability (Red): 2 Reactivity (Yellow): 0 Special (White): None
Potential dangers.
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 fire diamond rating for ethanol is 3-1-0. When handling ethanol, safety precautions should include wearing appropriate personal protective equipment such as gloves and goggles, working in a well-ventilated area to prevent inhalation of vapors, and storing it in a cool, dry place away from sources of ignition. Additionally, it is important to have proper fire extinguishing equipment nearby in case of a fire.
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.
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) andwhite -- specific hazard (no water, radioactive, acid, alkali, corrosive, oxidizer)Read more: What_does_the_National_Fire_Protection_Association_704_blue_color_code_stand_for