Class 1: Explosives
Class 1.1: Explosives
Mass Explosion Hazard
Class 1.2: Explosives
Class 1.3: Explosives
Minor Blast Hazard
Class 1.4: Explosives
Major Fire Hazard
Class 1.5: Blasting Agents
Class 1.6: Explosives
Extremely Insensitive Explosives
Gases which are compressed, liquefied or dissolved under pressure as detailed below. Some gases have subsidiary risk classes; poisonous or corrosive.
Class 2.1: Flammable Gas
Class 2.2: Nonflammable Gas
Class 2.3: Poisonous Gas
Class 2.2: Oxygen (Alternative Placard)
Class 2.3: Inhalation Hazard (Alternative Placard)
Flammable liquids included in Class 3 are included in one of the following packing groups:
Class 3: Flammable Liquids
Class 3: Combustible (Alternate Placard)
Class 3: Fuel Oil (Alternate Placard)
Class 3: Gasoline (Alternate Placard)
Solid substances that are easily ignited and readily combustible (nitrocellulose,magnesium, safety or strike-anywhere matches).
Solid substances that ignite spontaneously (aluminium alkyls, white phosphorus).
Solid substances that emit a flammable gas when wet or react violently with water (sodium, calcium, potassium, calcium carbide).
5.1 Oxidizing agents other than organic peroxides (calcium hypochlorite, ammonium nitrate, hydrogen peroxide, potassium permanganate).
5.2 Organic peroxides, either in liquid or solid form (benzoyl peroxides, cumene hydroperoxide).
6.1a Toxic substances which are liable to cause death or serious injury to human health if inhaled, swallowed or by skin absorption (potassium cyanide, mercuric chloride).
6.1b (Now PGIII) Toxic substances which are harmful to human health (N.B this symbol is no longer authorized by the United Nations) (pesticides,methylene chloride).
6.2 Biohazardous substances; the World Health Organization (WHO) divides this class into two categories: Category A: Infectious; and Category B: Samples (virus cultures, pathology specimens, used intravenous needles).
Radioactive substances comprise substances or a combination of substances which emit ionizing radiation (uranium, plutonium).
Corrosive substances are substances that can dissolve organic tissue or severely corrode certain metals:
Hazardous substances that do not fall into the other categories (asbestos, air-bag inflators, self inflating life rafts, dry ice).
Symbol: N/Environmental Hazard
Symbol: Xn/Harmful; Xi/Irritant