This standard applies to the classification and labeling for substances and mixtures which, in contact with water, emit flammable gases. It was updated on Oct 24, 2024 to align with UN GHS Rev.8, which replaced its 2008 version.

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.