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* Dangerous 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 and sometimes in Canada dangerous goods are more commonly known as hazardous materials.
* Include materials thatare 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.
* Dangerous goods are often indicated by diamond-shaped signage on the item, its container, and/orthe building where it is stored.
* The colours of each diamond in a way has reference to its hazard i.e.:
* Flammable = red because fire and heat are generally of red colour,
* Explosive = orange, because mixing red (flammable) with yellow (oxidising agent) creates orange.
* Non-flammable Non-toxic Gas = green, due to all compressed air vessels being this colourin France after World War.
* Mitigating the risks associated with hazardous materials may require the application of safety precautions during their transport, use, storage and disposal.
* Most countries regulate hazardous materials by law, and they are subject to several international treaties as well. Even so, different countries may use different class diamonds for the sameproduct. 
* People who handle dangerous goods will often wear protective equipment, and metropolitan fire departments often have a response team specifically trained to deal with accidents and spills.
* Persons who may come into contact with dangerous goods as part of their work are also often subject to monitoring or health surveillance to ensure that their exposure does not exceedoccupationalexposure limits.
* Laws and regulations on the use and handling of hazardous materials may differ depending on the activity and status of the material.
Explosive Dangerous Goods have compatibility group letters assigned to facilitate segregation during transport. The letters used range from A to S excluding the letters I, M, O, P, Q and R. 
* 1.1 Explosives with amass explosion hazard. (nitroglycerin/dynamite)
* 1.2 Explosives with a blast/projection hazard.
* 1.3 Explosives with a minor blast hazard. (rocket propellant, display fireworks)
* 1.4 Explosives with a major fire hazard. (consumer fireworks, ammunition)
* 1.5 Blasting agents.
* 1.6 Extremely insensitive explosives.
Class 2: gases
Gases which are compressed,liquefied or dissolved under pressure as detailed below. Some gases have subsidiary risk classes; poisonous or corrosive.
* 2.1 Flammable Gas: Gases which ignite on contact with an ignition source, such as acetylene and hydrogen.
* 2.2 Non-Flammable Gases: Gases which are neither flammable nor poisonous. Includes the cryogenic gases/liquids (temperatures of below -100°C) used forcryopreservation and rocket fuels, such as nitrogen and neon.
* 2.3 Poisonous Gases: Gases liable to cause death or serious injury to human health if inhaled; examples are fluorine, chlorine, and hydrogen cyanide.
Class 3: flammable liquids
Flammable liquids included in Class 3 are included in one of the following packing groups:
* Packing Group I, if they have an initial boiling point of 35°C orless at an absolute pressure of 101.3 kPa and any flash point, such as diethyl ether or carbon disulfide;
* Packing Group II, if they have an initial boiling point greater than 35°C at an absolute pressure of 101.3 kPa and a flash point less than 23°C, such as gasoline (petrol) and acetone; or
* Packing Group III, if the criteria for inclusion in Packing Group I or II are not met,...
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