Flammable Gas : Gasses which ignite on contact with an ignition source, i.e. acetylene and hydrogen.

Non-Flammable Gasses : Gasses which are neither flammable nor poisonous. Includes the cryogenic gasses/liquids (temp < 100oC) used for cryopreservation and rocket fuels, i.e. nitrogen and neon.

Poisonous Gasses : Gasses liable to cause death or serious injury to human health if inhaled; i.e. fluorine, chlorine and hydrogen cyanide.

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 or less at an absolute pressure of 101.3kPa and any Flash Point; i.e. diethyl ether or carbon disulfide or

Packing Group II – if they have an initial boiling point greater than 35°C at an absolute pressure of 101.3kPa and a Flash Point less than 23°C; i.e. Petrol, Acetone or

Packing Group III – if the criteria for inclusion in Packing Group I and II are not met; i.e. Kerosene and Diesel

Flammable Solids : Solid substances that are easily ignited and readily combustible; i.e. nitrocellulose, magnesium, safety matches

Spontaneously Combustible : Solid substances that ignite spontaneously; i.e. Aluminium Alkyls, White Phosphorus

Dangerous When Wet : Solid substances that emit a flammable gas when or react violently with water; i.e. Sodium, Calcium, Potassium, Calcium Carbide

Oxidising Agent : Oxidising agents other than organic peroxides; i.e. calcium, hypochlorite, ammonium nitrate, hydrogen peroxide, potassium permanganate.

Organic Peroxide Oxidising Agent : Either in liquid or solid form; i.e. benzoyl peroxides, cumene hydroperoxide.

Toxic Substances : which are a liable to cause death or serious injury to human health if inhaled, swallowed or by skin absorption; i.e. Potassium Cyanide, Mercuric Chloride

(PGIII) : Toxic substances which are harmful to human health; i.e. pesticides, methylene chloride

Radioactive substances comprise substances or a combination of substances which emit ionising radiation; i.e. uranium, plutonium.

Corrosive Substances (Acids) : Substances that can dissolve organic tissue or severely corrode certain metals; i.e. Sulfuric Acid, Hydrochloric Acid

Corrosive Substances (Alkalis) : Substances that can dissolve organic tissue or severely corrode certain metals; i.e. Potassium hydroxide, Sodium Hydroxide

Hazardous substances that do not fall into the other categories; i.e. Asbestos; air-bag inflators, self inflating life rafts, dry ice