| Pure Methane | ||||
| Component | Symbol | Mass fraction | Concentration | Units |
| Methane | CH4 | ≥99.99 | ≥99.99 | % |
| Hydrogen | H2 | <10 | ≤05 | ppmV |
| Oxygen | O2 | <10 | ≤05 | ppmV |
| Nitrogen | N2 | <35 | ≤25 | ppmV |
| Other hydrocarbon | CxHy | ≤25 | ≤20 | ppmV |
| Moisture | ≤10 | ≤8 | ppmV | |