Cetane Index - ASTM D4737 (improved)
ASTM D4737 improved 4-variable Cetane Index formula (preferred over D976 for regulatory use).
Cetane Index D4737
88.0 -
Formula, assumptions, and limits
Preferred over D976 for regulatory acceptance. ISO 8217 DMA minimum Cetane 40. D4737 accurate to ±3 cetane numbers vs engine CN.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Distillation recovery temperatures | °C | ASTM D86 | |
| Density @ 15 °C | g/ml | ISO 12185 |