Cetane Index - ASTM D976 (4-variable)
Calculated Cetane Index for distillate marine fuels using ASTM D976 four-variable formula - a surrogate for DCN / cetane number when no engine test is available.
API gravity
37.35°API
Cetane Index (D976)
126.5 -
Formula, assumptions, and limits
D976 is obsolete for regulatory use; D4737 (4-variable with improved correlation) preferred. DMA and DFA typically 40–48. Below 40 triggers ignition-delay issues.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Distillation recovery temperatures | °C | ASTM D86 | |
| API gravity / 100 | - | D1298 density |