National Fire Protection Agency (NFPA) Hazard Ratings
| Category | Hazard Degree | Description | Database Matches |
|---|---|---|---|
| Health | 4 | Materials that, under emergency conditions, can be lethal | Search |
| Health | 3 | Materials that, under emergency conditions, can cause serious or permanent injury. | Search |
| Health | 2 | Materials that, under emergency conditions, can cause temporary incapacitation or residual injury. | Search |
| Health | 1 | Materials that, under emergency conditions, can cause significant irritation | Search |
| Health | 0 | Materials that, under emergency conditions, would offer no hazard beyond that or ordinary combustible materials. | Search |
| Flammability | 4 | Materials that rapidly or completely vaporize at atmospheric pressure and normal ambient temperature or that are readily dispersed in air and burn readily | Search |
| Flammability | 3 | Liquids and solids (including finely dividied suspended solids) that can be ignited under almost all ambient temperature conditions. Materials in this degree produce hazardous atmospheres with air under almost all ambient temperatures or, though unaffected by ambient temperatures, are readily ignited under almost all conditions. | Search |
| Flammability | 2 | Materials that must be moderately heated or exposed to relatively high ambient temperatures before ignition can occur. Under normal conditions, these materials would not form hazardous atmospheres with air, but under high ambient temperatures or under moderate heating they could release vapor in sufficient quantities to prodouce hazardous atmospheres with air. Materials in the this degree also include finely divided suspended solids that do not require heathing before ignition can occur. | Search |
| Flammability | 1 | Materials that must be preheated before ignition can occur. Materials in this degree require considerable preheating, under all ambient temperature conditions, before ignition and combustion can occur. Materials in this degree also include finely divided suspended solids that do not require heathing before ignition can occur. | Search |
| Flammability | 0 | Materials that will not burn under typical fire conditions, including intrinsically noncombustible materials sucah as concrete, stone and sand. | Search |
| Instability | 4 | Materials that in themselves are readily capable of detonation or explosive decomposition or explosive reaction at normal temperatures and pressures. | Search |
| Instability | 3 | Materials that in themselves are capable of detonation or explosive decomposition or explosive reaction but that require a strong initiating source or must be heated under confinement before initiation. | Search |
| Instability | 2 | Materials that readily undergo violent chemical change at elevated temperatures and pressures. | Search |
| Instability | 1 | Materials that in themselves are normally stable but that can become unstable at elevated temperatures and pressures. | Search |
| Instability | 0 | Materials that in themselves are normally stable, even under fire conditions. | Search |
| Special | W | Materials that react violently or explosively with water. | Search |
| Special | OX | Materials that posses oxidizing properties. | Search |
| Special | SA | Materials that are simple asphyxiant gases. Limited to: nitrogen, helium, neon, argon, krypton and xenon. | Search |