Special Health Hazard (SHH) Codes
Code Hazard Definition
CA Carcinogen A carcinogen is a substance that causes cancer. Cancer is a group of diseases characterized by uncontrolled growth and spread of abnormal cells. If the spread is not controlled, it can result in death.
CO Corrosive Corrosive substances are gases, liquids or solids that cause destruction of human skin or severe corrosion of containers. The concentration and duration of exposure control the degree of injury. Acids, caustics, soaps, detergents, and lye are examples of corrosives.
Flammable Flammable substances are solids, liquids, vapors or gases that ignite easily and burn rapidly. These chemicals are classified by their flash point. Flash point is the lowest temperature at which a liquid will give off vapors in sufficient concentrations to ignite. Flammable substances are classified into four groups. The two most hazardous are F4 and F3.
F4 Flammable – 4th degree materials that readily vaporize and/or burn readily in the air
F3 Flammable – 3rd degree liquids and solids that can be ignited under almost all ambient air conditions
MU Mutagen A mutagen is a substance that causes mutations. A mutation is a change in the genetic material in a body cell. Mutations can lead to birth defects, miscarriages, or cancer.
Reactive – is used interchangeably with the NPFA (National Fire Protection Association) term “instability” Reactive or unstable chemicals (solid, liquid or gas) are substances that produce or release energy in the form of heat or an explosion when under pressure, exposed to light, or subjected to friction or ignition. These materials may also develop toxic or flammable vapors when mixed with water. Reactive substances are classified into four groups. The three most hazardous are R4, R3, and R2.
R4 Reactive – 4th degree materials readily capable of detonation or explosive decomposition or explosive reaction at normal temperature and pressure
R3 Reactive – 3rd degree materials capable of detonation or explosive decomposition or explosive reaction, but which require strong initiating source or which must be heated under confinement before initiation
R2 Reactive – 2nd degree materials normally unstable and readily undergo violent chemical change but do not detonate
TE Teratogen A teratogen is a substance that causes birth defects by damaging the embryo or fetus. These chemicals cause specific abnormalities at specific times during pregnancy. These abnormalities can lead to mental or physical disabilities that may be fatal.
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