Class 4 – Flammable Solids

Substances Liable To Spontaneous Combustion;

Substances Which, In Contact With Water, Emit Flammable Gases

Class 4 is divided into three divisions as follows:

  1. Division 4.1 Flammable solids
    Solids which, under conditions encountered in transport, are readily combustible or may cause or contribute to fire through friction; self-reactive substances which are liable to undergo a strongly exothermic reaction; solid desensitized explosives which may explode if not diluted sufficiently;
  2. Division 4.2 Substances liable to spontaneous combustion
    Substances which are liable to spontaneous heating under normal conditions encountered in transport, or to heating up in contact with air, and being then liable to catch fire;
  3. Division 4.3 Substances which in contact with water emit flammable gases
    Substances which, by interaction with water, are liable to become spontaneously flammable or to give off flammable gases in dangerous quantities.

Class 4 substances are identified by the Class 4 labels (samples available for download below) and Class 4 designation in any Safety Data Sheet.

Refer to:

  • Local laws
  • Australian Dangerous Goods (ADG) Code or IMDG Code or IATA
  • AS 1216-2006, Class labels for dangerous goods
  • AS/NZS 4745:2012, Code of practice for handling combustible dusts
  • AS/NZS 5026:2012, The storage and handling of Class 4 dangerous goods
  • Click Here to Purchase Australian Standards
  • Safety Data Sheets