E2630-LEL
Rev 23.03.2021
Hydrogen
A colorless, odorless, flammable gas, that is much lighter than air. Mixtures with air are
explosive. Results from the interaction of acids, bases, and water with active metals and
from the electrolysis of aqueous solutions. In industrial production, the main source of
hydrogen is hydrocarbons.
Chemical formula
H
2
Molar weight
2
Relative gas density (to air)
0.07
Conversion
1 ppm = 0.0818 mg/m
3
Boiling point
−252.88 °C
Low explosive limit (LEL), % vol. in air
4.0
Upper explosive limit (UEL), % vol. in air
75
Odor
Odorless
Hazards
Flammable forms explosive mixtures with air.
Asphyxiant.
Exposure limits
not established
5
