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The NFPA 704, or the “hazard diamond”, is the familiar hazard identification system and ratings standard prescribed by the National Fire Protection Association.
| 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 WARNINGS (WHITE) | ||
| - | Water Reactive | |
| Oxy | - | Oxidizing Agent |