Solid substances that are easily ignited and readily combustible (nitrocellulose, magnesium, safely or stike-anywhere matches).
Class 4.3 – Dangerous when Wet
Solid substances that emit a flammable gas when wet or react violently with water(sodium, calcium, potassium, calcium carbide).
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Class 4.2 – Spontaneously Combustible Solids
Solid substances that ignite spontaneously (aluminium alkyls, white phosphorus).
Class 5 – Oxidizing substances & organic peroxides
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Class 5.1 – Oxidizing Agent
Oxidizing Agent other than organic peroxides (calcium hypochlorite, ammonium nitrate, hydrogen peroside, potassium permanganate
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Class 5.2 – Organic Peroxide Oxidizing Agent
Organic peroxides, either in liquid or solid from (benzoyl peroxides, cumene hydroperoxide).
Class 6 – Poisonous (toxic) & Infectious Substances
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Class 6.1 – Poison
a. 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).
b. (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).
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Class 6.2 – Biohazard
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).
Class 7 – Radioactive Materials
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Class 7 – Radioactive
Radioactive substances comprise substances or a combination of substances which emit ionizing radiation (uranium, plutonium).
Class 8 – Corrosives
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Class 8 – Corrosive
Corrosive substances are substances that can dissolve organic tissue or severely corrode certain metals.
