1 Scope
This standard specifies terms and definitions, classification, decision logic and guidance, category and precautionary labelling, arrangement of category and labelling element, and general requirements for precautionary statements of self-heating substances.
This standard is applicable to hazards classification, precautionary labelling and precautionary statements of self-heating substances in accordance with the United Nations "Globally Harmonized System of Classification and Labeling of Chemicals".
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB 6944-2005 Classification and Code of Dangerous Goods
UN Globally Harmonized System of Classification and Labeling of Chemicals (GHS)
UN Recommendations on the Transport of Dangerous Goods: Manual of Tests and Criteria (the fourth revised edition) (TDG/MR)
UN Recommendations on the Transport of Dangerous Goods-Model Regulation
3 Term and Definition
Self-heating substances
A solid or liquid substance or mixture which, by reaction with air and without energy supply, is liable to self-heat. This substance or mixture differs from a pyrophoric liquid or solid in that it ignites only in large amounts (kilograms) and after long periods of time (hours or days).
Note: Self-heating of substances or mixtures and the resulted spontaneous combustion is caused by reaction of the substance or mixture with oxygen (in the air) and the heat developed not being conducted away rapidly enough to the surroundings. Spontaneous combustion occurs when the rate of heat production exceeds the rate of heat loss and the auto-ignition temperature is reached.
