Flammability of common gases

Non-flammable               

(Asphyxiant)

Argon (Ar) 

Carbon Dioxide (CO₂)              

Helium (He)

Nitrogen (N₂)

N/A

N/A

N/A

N/A

Toxic / Corrosive

Chlorine (Cl₂)

Sulphur Dioxide (SO₂)

N/A

N/A

Flammable

Hydrogen (H₂)

Methane (CH₄)

Ethane (C₂H₆)

Propane (C₃H₈)

Butane (C₄H₁₀)

Pentane (C₅H₁₂)

Carbon Monoxide (CO)

Hydrogen sulphide (H₂S)

Ammonia (NH₃)

4% to 77%

4.4% to 17%

2.4% to 12.5%

1.7% to 10.9%

1.4% to 9.5%

1.5% to 7.8%

10.9% to 74%

3.9% to 45.5%

15.4% to 33.6%

Oxidizer

(Supports combustion)

Nitric oxide (NO)

Nitrous oxide (N₂O)

Nitrogen dioxide (NO₂)

Oxygen (O₂)

N/A

N/A

N/A

N/A