What Does Flammable Gas Mean?
A flammable gas is a gas that burns in the presence of an oxidant when provided with a source of ignition. Flammable gasses can include methane, acetylene, ammonia, hydrogen, propane, and propylene. The risk of a fire starting increases in relation to the amount of gas present. If the concentration exceeds the higher value (UEL), the air will become too rich to burn, which will actually reduce the chance of ignition. OSHA does not categorize aerosols as flammable gasses.