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NFPA Ratings

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