General characteristics
Hydrogen is a colourless, tasteless and odourless gas. Hydrogen has a very low density, being 14.38 times lighter than air. It is flammable in a wide range of concentrations and burns with a colourless to slightly bluish flame. Hydrogen has a high calorific value (120 MJ/kg).
Basic quality parameters
The quality of hydrogen for use in mobility is specified in ISO 14687 and EN 17124.
Specification
| Hydrogen purity (mol. %) |
99,97% |
| Total non-hydrogen gases |
300 µmol/mol
|
| Water (H2O) |
max. 5 µmol/mol |
| Total hydrocarbons (excluding Methane) |
max. 2 µmol/mol |
| Methane (CH4) |
max. 100 µmol/mol |
| Oxygen (O2) |
max. 5 µmol/mol |
| Helium (He) |
max. 300 µmol/mol |
| Nitrogen (N2) |
max. 300 µmol/mol |
| Argon (Ar) |
max. 300 µmol/mol |
| Carbon dioxide (CO2) |
max. 2 µmol/mol |
| Carbon monoxid (CO) |
max. 0,2 µmol/mol |
| Sulphur compounds |
max. 0,004 µmol/mol |
| Formaldehyde (HCHO) |
max. 0,2 µmol/mol |
| Formic acid (HCOOH) |
max. 0,2 µmol/mol |
| Ammonia (NH3) |
max. 0,1 µmol/mol |
| Halogenated compounds |
max. 0,005 µmol/mol |
| Particulate matter |
max. 1mg/kg |
Use
Use in transport as fuel for fuel cells. In fuel cells, hydrogen and oxygen generate electricity, which is used to power a vehicle, and clean water.
Traffic signs
RID/ADR: Class 2
UN: 1049
Kemler: 23