Dangerous Goods Educational Services
Dangerous Goods Educational Services
Lesson 1, Topic 1
In Progress

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Class 4 – Flammable Solids; Substances Liable to Spontaneous Combustion; Substances Which, in Contact with Water, Emit Flammable Gases
(TDGR 2.20)


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Class 4 has 3 Divisions:

4.1 Flammable Solid

  • Readily combustible,
  • Liable to cause or contribute to a fire through friction,
  • Solid desensitized explosives which may explode if not diluted sufficiently. Desensitized through wetting with water or alcohols or diluted with other substances;

Packing Group Criteria can be found in TDGR 2.22 (1)

Packing Group Criteria can be found in TDGR 2.22 (2)

4.2 Spontaneously Combustible

  • Self-heating substances that when in large  amounts (kilograms), spontaneously ignite on contact with air for long periods (hours or\ days).
  • Pyrophoric substances that even in small quantities, ignite within 5 minutes after coming into contact with air;

4.3 Substances Which, in Contact with Water, Emit Flammable Gases (Dangerous When Wet)

  • When in contact with water are likely to spontaneously ignite or

  • Prone to emitting dangerous quantities of flammable gases.

Packing Group Criteria can be found in TDGR 2.22 (3)