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| Information on this graphic changes depending on which, "Division" of explosive is shipped. 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. The example above shows an explosive with a compatibility group "A" (shown as 1.1A). The actual letter shown would depend on the specific properties of the substance being transported. For example, the Canadian Transportation of Dangerous Goods Regulations provides a description of compatibility groups. |
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| 1.1 Explosives with a mass explosion hazard |
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| 1.1A TNT, dynamite, nitroglycerine |
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| 1.2 Explosives with a severe projection hazard |
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| 1.3 Explosives with a fire, blast or projection hazard but not a mass explosion hazard |
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| 1.4 Minor fire or projection hazard (includes ammunition and most consumer fireworks) |
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| 1.5 An insensitive substance with a mass explosion hazard (explosion similar to 1.1) |
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| 1.6 Extremely insensitive articles |
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| Gases which are compressed, liquefied or dissolved under pressure as detailed below. Some gases have subsidiary risk classes; poisonous or corrosive. |
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| 2.1 Flammable Gas - Gases which ignite on contact with an ignition source. Ex: acetylene, hydrogen. |
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| 2.3 Poisonous Gases - Gases liable to cause death or serious injury to human health if inhaled. Ex: fluorine, chlorine, hydrogen cyanide. Includes the cryogenic gases/liquids (temperatures of below -100 °C) used for cryopreservation and rocket fuels. |
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| 2.2 Non-Flammable Gases - Gases which are neither flammable nor poisonous. Ex: nitrogen, neon. |
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| Flammable liquids included in Class 3 are included in one of the following packing groups: |
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| Packing Group I - If they have an initial boiling point of 35°C or less at an absolute pressure of 101.3 kPa and any flash point. Ex: diethyl ether, carbon disulfide. |
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| 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. Ex: gasoline (petrol), acetone. |
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| Packing Group III - If the criteria for inclusion in Packing Group I or II are not met. Ex: kerosene, diesel. |
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| 4.1 Flammable solids which are easily ignited and readily combustible. Ex: nitrocellulose, magnesium, safety or strike-anywhere matches. |
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| 4.2 Spontaneously combustible substances. Ex: aluminum alkyls, white phosphorus. |
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| 4.3 Substances which emit a flammable gas when wet or react violently with water. Ex: sodium, calcium, potassium. |
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| 5.1 Oxidizing agents other than organic peroxides. Ex: calcium hypochlorite, ammonium nitrate, hydrogen peroxide, potassium permanganate. |
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| 5.2 Organic peroxides, either in liquid or solid form. Ex: benzoyl peroxides, cumene hydroperoxide. |
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| 6.1a Toxic substances which are liable to cause death or serious injury to human health if inhaled, swallowed or by skin absorption. Ex: potassium cyanide, mercuric chloride, hydrofluoric acid. |
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| 6.1b (Now PGIII) Toxic substances which are harmful to human health (N.B this symbol is no longer authorized by the United Nations). Ex: low toxicity pesticides, methylene chloride. |
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| 6.2 Biohazardous substances. Ex: virus cultures, pathology specimens, used intravenous needles. |
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| 7 Radioactive substances comprise substances or a combination of substances which emit ionizing radiation. Ex: uranium, plutonium. |
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| 8.1 Acids - Ex: sulfuric acid, hydrochloric acid. |
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| 8.2 Alkalis - Ex: potassium hydroxide, sodium hydroxide. |
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| 9 Hazardous substances that do not fall into the other categories. Ex: asbestos, air-bag inflators, self inflating life rafts, dry ice. |
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