| OT series | OT-10 | OT-20 | OT-33 | |
| S content % | 90 min. | 80 min. | 66 min. | |
| IS content %(On total S) | 90 min. | 90 min. | 90 min. | |
| Oil content % | 10±1 | 20±1 | 33±1 | |
| Acid(as H2SO4) % | 0.05 max | |||
| Ash % | 0.15 max | |||
| 100 mesh Sieve residues % | 0.2 max | |||
| 150 mesh Sieve residues % | 0.1 max | |||
