| Test | Method | Specification |
| MTBE (Methyl tertiary-butyl ether), purity by GC (% w/w) | DOR 560 | 99.9 min |
| Other organics (% w/w) | DOR 560 | 0.1 max |
| Color, Pt-Co scale (APHA) | APHA | 15 max |
| Water (% w/w) | KF | 0.05 max |
| Residue on evaporation (% w/w) | DOR 100 | 0.005 max |
