GHS hazard statement

H230: May react explosively even in the absence of air

H230
Physical hazards
Danger

H230 means “May react explosively even in the absence of air”. It is a GHS hazard statement for Flammable gases (1A, Chemically unstable gas A), shown with GHS02 under the signal word “Danger”.

Hazard class and category

Hazard class	Category	Pictogram	Signal word	UN transport class
Flammable gases	1A, Chemically unstable gas A		Danger	Div 2.1

What H230 means

Flammable gases are gases that form a flammable mixture with air at 20 °C and a standard pressure of 101.3 kPa.

A leak can create an explosive atmosphere, and the gas can ignite from a spark, hot surface or flame some distance from the source. Many flammable gases are also stored under pressure.

What to do

Keep away from all ignition sources, ventilate the area, use only explosion-protected equipment where required, and do not extinguish a gas fire unless the leak can be stopped safely, because the unburnt gas can re-ignite or explode.

This is general guidance for the hazard class. The safety data sheet for your product always takes precedence.

Precautionary statements for H230

The GHS lists these precautionary statements for this hazard. Which ones appear on a label depends on the supplier's classification.

Code	Statement
P203	Obtain, read and follow all safety instructions before use.
P210	Keep away from heat, hot surface, sparks, open flames and other ignition sources. No smoking.
P337	If eye irritation persists:
P381	In case of leakage, eliminate all ignition sources.
P403	Store in a well-ventilated place.

Chemicals carrying H230

No chemicals in our database are classified with H230 yet.

H230 frequently asked questions

What does H230 mean?

H230 means "May react explosively even in the absence of air". It is a GHS hazard statement in the physical hazards group, covering Flammable gases (1A, Chemically unstable gas A).

Which pictogram goes with H230?

H230 is shown with GHS02 (Flame).

What signal word goes with H230?

The signal word for H230 is "Danger".

Which precautionary statements go with H230?

The GHS data lists 5 precautionary statements for H230, including P203, P210, P337, P381, P403. They cover prevention, response, storage and disposal. The full list is on this page.

Hazard statements describe the hazard of a classified substance or mixture. The classification of a specific product can differ, so use the supplier's SDS.

https://pubchem.ncbi.nlm.nih.gov/ghs/ghscode_10.txt (UN GHS Revision 10, retrieved 2026-10-12)