Portal:Hazardous materials

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Introduction HAZMAT categories
An emergency medical technician team training as rescue (grey suits) and decontamination (green suits) respondents to hazardous material and toxic contamination situations.

Dangerous goods or hazardous goods are solids, liquids, or gases that can harm people, other living organisms, property, or the environment. They are often subject to chemical regulations. In the United States, United Kingdom and sometimes in Canada, dangerous goods are more commonly known as hazardous materials (abbreviated as HAZMAT or hazmat). Hazmat teams are personnel specially trained to handle dangerous goods, which include materials that are radioactive, flammable, explosive, corrosive, oxidizing, asphyxiating, biohazardous, toxic, pathogenic, or allergenic. Also included are physical conditions such as compressed gases and liquids or hot materials, including all goods containing such materials or chemicals, or may have other characteristics that render them hazardous in specific circumstances.

In the United States, dangerous goods are often indicated by diamond-shaped signage on the item (see NFPA 704), its container, or the building where it is stored. The color of each diamond indicates its hazard, e.g., flammable is indicated with red, because fire and heat are generally of red color, and explosive is indicated with orange, because mixing red (flammable) with yellow (oxidizing agent) creates orange. A nonflammable or nontoxic gas is indicated with green, because all compressed air vessels are this color in France after World War II, and France was where the diamond system of hazmat identification originated.

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Class 1: Explosives
Class 1: Explosives
Class 5.2: Organic Peroxide Oxidizing Agent
Class 5.2: Organic peroxides
Class 2.1: Flammable Gas
Class 2.1: Flammable gas
Class 6: Inhalation Hazard
Class 6: Inhalation hazard
Class 2.2: Nonflammable Gas
Class 2.2: Nonflammable gas
Class 6: Poison Gas III
Class 6: Poison gas III
Class 2.3: Poisonous Gas
Class 2.3: Poisonous gas
Class 6: Toxic
Class 6: Toxic
Class 3: Flammable Liquids
Class 3: Flammable liquids
Class 6.1: Poison
Class 6.1: Poison
Class 4.1: Flammable Solids
Class 4.1: Flammable solids
Class 6.2: Biohazard
Class 6.2: Biohazard
Class 4.2: Spontaneously Combustible Solids
Class 4.2: Spontaneously combustible
Class 7: Radioactive
Class 7: Radioactive substances
Class 4.3: Dangerous when Wet
Class 4.3: Dangerous when wet
Class 8: Corrosive
Class 8: Corrosive substances
Class 5.1: Oxidizing Agent
Class 5.1: Oxidizing agents
Class 9: Miscellaneous
Class 9: Miscellaneous substances
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