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Health (Blue)
| 4 | Danger | May be fatal on short exposure. Specialized protective equipment required |
| 3 | Warning | Corrosive or toxic. Avoid skin contact or inhalation |
| 2 | Warning | May be harmful if inhaled or absorbed |
| 1 | Caution | May be irritating |
| 0 | No unusual hazard |
Flammability (Red)
| 4 | Danger | Flammable gas or extremely flammable liquid |
| 3 | Warning | Flammable liquid flash point below 100° F |
| 2 | Caution | Combustible liquid flash point of 100° to 200° F |
| 1 | Combustible if heated | |
| 0 | Not combustible |
Reactivity (Yellow)
| 4 | Danger | Explosive material at room temperature |
| 3 | Danger | May be explosive if shocked, heated under confinement or mixed with water |
| 2 | Warning | Unstable or may react violently if mixed with water |
| 1 | Caution | May react if heated or mixed with water but not violently |
| 0 | Stable | Not reactive when mixed with water |
Special Notice Key (White)
| W | Water Reactive |
| Oxy | Oxidizing Agent |