GHS hazard class · Physical hazards
Substances and mixtures which in contact with water, emit flammable gases
Substances and mixtures which, in contact with water, emit flammable gases are solids or liquids that react with water to give off a flammable gas, sometimes in dangerous quantities or with enough heat to ignite it.
What it means
Contact with water, damp air or moisture can release flammable gas that may ignite spontaneously. Using water to fight a fire involving the material can make it worse.
What to do
Keep dry and in tightly closed containers, protect from moisture, do not use water to extinguish a fire unless the SDS says it is safe, and use only the extinguishing agents the SDS lists.
This is general guidance for the class. Your product's safety data sheet takes precedence.
Categories and hazard statements
Chemicals with substances and mixtures which in contact with water, emit flammable gases hazard codes
Chemicals in our database whose primary classification includes any current Substances and mixtures which in contact with water, emit flammable gases code (H260, H261).
No chemicals in our database carry these codes yet.
Substances and mixtures which in contact with water, emit flammable gases: frequently asked questions
What is the GHS hazard class "Substances and mixtures which in contact with water, emit flammable gases"?
Substances and mixtures which, in contact with water, emit flammable gases are solids or liquids that react with water to give off a flammable gas, sometimes in dangerous quantities or with enough heat to ignite it.
Which hazard statements belong to Substances and mixtures which in contact with water, emit flammable gases?
The current hazard statements for this class are H260, H261.
Which pictograms and signal words are used for Substances and mixtures which in contact with water, emit flammable gases?
Pictograms: GHS02 (Flame). Signal words: Danger or Warning, depending on the category.
What should I do when working with a substances and mixtures which in contact with water, emit flammable gases hazard?
Keep dry and in tightly closed containers, protect from moisture, do not use water to extinguish a fire unless the SDS says it is safe, and use only the extinguishing agents the SDS lists.
https://pubchem.ncbi.nlm.nih.gov/ghs/ghscode_10.txt (UN GHS Revision 10, retrieved 2026-10-12)