Class 4 - Flammable Solids
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:
Division 4.1: Flammable solids that are readily combustible or may contribute to fire through friction; self-reactive substances with strongly exothermic reactions; solid desensitized explosives that may explode if not sufficiently diluted.
Division 4.2: Substances liable to spontaneous combustion under normal transport conditions, or heating up in contact with air, and then catching fire.
Division 4.3: Substances that, in contact with water, become spontaneously flammable or emit dangerous quantities of flammable gases.
Class 4 substances are identified by the Class 4 labels and the Class 4 designation in any Safety Data Sheet.

Division 4.1: Flammable Solid

Division 4.2: Substances Liable To Spontaneous Combustion

Division 4.3: Substances Which, In Contact With Water, Emit Flammable Gases
Refer to:
- Local Regulations
- Australian Dangerous Goods (ADG) Code or IMDG Code or IATA
- AS 1216: Class labels for dangerous goods
- AS/NZS 4745: Code of practice for handling combustible dusts
- AS/NZS 5026: The storage and handling of Class 4 dangerous goods
- Purchase the Australian Standards
- Safety Data Sheets