GHS hazard statement
H220: Extremely flammable gas
- H220
- Physical hazards
- Danger
H220 means “Extremely flammable gas”. It is a GHS hazard statement for Flammable gases (1A: Flammable gas, Pyrophoric gas, Chemically unstable gas A,B), shown with GHS02 under the signal word “Danger”.
Hazard class and category
| Hazard class | Category | Pictogram | Signal word | UN transport class |
|---|---|---|---|---|
| Flammable gases | 1A: Flammable gas, Pyrophoric gas, Chemically unstable gas A,B |  | Danger | Div 2.1 |
What H220 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 H220
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. |
| P222 | Do not allow contact with air. |
| P280 | Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/... |
| P377 | Leaking gas fire: Do not extinguish, unless leak can be stopped safely. |
| P381 | In case of leakage, eliminate all ignition sources. |
| P403 | Store in a well-ventilated place. |
Chemicals carrying H220
9 chemicals in our database. Classification comes from each chemical's primary GHS source, so a supplier's SDS may differ.
H220 frequently asked questions
What does H220 mean?
H220 means "Extremely flammable gas". It is a GHS hazard statement in the physical hazards group, covering Flammable gases (1A: Flammable gas, Pyrophoric gas, Chemically unstable gas A,B).
Which pictogram goes with H220?
H220 is shown with GHS02 (Flame).
What signal word goes with H220?
The signal word for H220 is "Danger".
Which precautionary statements go with H220?
The GHS data lists 7 precautionary statements for H220, including P203, P210, P222, P280, P377. 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)