IATA Class 4 Division 4.1 Self-reactive Substances

A self-reactive substance is thermally unstable and is liable to undergo a strongly exothermic decomposition even without the presence of oxygen.

The decomposition of self-reactive substances is initiated by heat, friction, impact, or contact with catalytic impurities, such as acids and bases. The rate of decomposition is dependent on temperature and the type of substance. Because of this, self-reactive substances must be protected from direct sunlight and all sources of heat. They must also be placed in well-ventilated areas.

Self-reactive substances are classified according to the degree of danger they present. Appendix C.1 lists the self-reactive substances that are permitted for transport. The appropriate generic entry listed in Section 4.2 List of Dangerous Goods must be assigned (UN 3221 to UN 3240), along with any subsidiary risks. The generic entry specifies the type of self-reactive substance, labeled B through F, the physical state of the substance (solid or liquid), and if a temperature control is required. Self-reactive substances not listed in Appendix C.1 must be assigned to a generic entry by the appropriate State authority.

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