| Item name |
Index |
| Hydrogen purity (molar fraction) |
99.97% |
| Total non-hydrogen gas |
300 μmol/mol |
| Maximum concentration of a single impurity |
| Water (H2O) |
5 μmol/mol |
| Total hydrocarbons (calculated as methane) |
2 μmol/mol |
| Oxygen (O2) |
5 μmol/mol |
| Helium (He) |
300 μmol/mol |
| Total nitrogen (N 2 ) and argon (Ar) |
100 μmol/mol |
| Carbon dioxide (CO2) |
2 μmol/mol |
| Carbon monoxide (CO) |
0.2 μmol/mol |
| Total sulfur (calculated as H2S) |
0.004 μmol/mol |
| Formaldehyde (HCHO) |
0.01 μmol/mol |
| Formic acid (HCOOH) |
0.2 μmol/mol |
| Ammonia (NH2) |
0.1 μmol/mol |
| Total halogen compounds (calculated as halide ions) |
0.05 μmol/mol |
| Maximum particle concentration |
1 mg/kg |
| When the methane concentration exceeds 2 μmol/mol, the total concentration of methane, nitrogen and argon is not allowed to exceed 100 mol/mol |
