This standard applies to the classification and labeling for substances and mixtures which, in contact with water, emit flammable gases. The current version is an update of its initial one published on 12 Oct 2006, based on Globally Harmonized System of Classification and Labeling of Chemicals, ST/SG/AC. 10/31/Rev.2 (GHS Rev.2 released in 2007).

A substance or mixture which, in contact with water, emits flammable gases is a solid or liquid substance or mixture which, by interaction with water, is liable to become spontaneously flammable or to give off flammable gases in dangerous quantities.