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•  4  Very short exposure could cause death or major residual injury (e.g., hydrogen cyanide).
•  3  Short exposure could cause serious temporary or residual injury (e.g., chlorine gas).
•  2  Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury (e.g., chloroform).
•  1  Exposure would cause irritation with only minor residual injury (e.g., turpentine).
•  0  Poses no health hazard, no precautions necessary. (e.g., lanolin).

•  4  Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily (e.g., propane). Flash point below 23°C (73°F).
•  3  Liquids and solids that can be ignited under almost all ambient temperature conditions (e.g., gasoline). Flash point below 38°C (100°F) but above 23°C (73°F).
•  2  Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur (e.g., diesel fuel). Flash point between 38°C (100°F) and 93°C (200°F).
•  1  Must be pre-heated before ignition can occur (e.g., canola oil). Flash point over 93°C (200°F).
•  0  Will not burn (e.g., water).

•  4  Readily capable of detonation or explosive decomposition at normal temperatures and pressures (e.g., nitroglycerin).
•  3  Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked (e.g., fluorine).
•  2  Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water (e.g., phosphorus).
•  1  Normally stable, but can become unstable at elevated temperatures and pressures (e.g., calcium).
•  0  Normally stable, even under fire exposure conditions, and is not reactive with water (e.g., helium).