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.
The number 4 on the NFPA 704 placard indicates the highest hazard in any of the three categories (health, fire, reactivity).
240
NFPA 704 for cyclohexane: 1-3-0
The first guide is from 1960.
0-0-0
Health (Blue): 1 Flammability (Red): 2 Reactivity (Yellow): 0 Special (White): None
Potential dangers.
Health (blue) 2 Fire (red) 0 Reactivity (yellow) 0
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
Fire Hazard: 2, Red square Special Information: 4 Health hazard: 1 Reactivity hazard: 3
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)