Cetane

The cetane number or cetane index is an indicator of the combustion speed of diesel fuel and the compression needed for ignition. Diesel with a lower cetane number provokes ignition delays and requires more time for the combustion process to be completed. In other words, higher cetane numbers indicate better ignition quality. Therefore, diesel with a higher cetane number is preferred by engine makers as it influences engine efficiency.

In Morocco the cetane number and cetane index are regulated, with minimum limits of 51 and 46 respectively.

According to SGS Worldwide Fuel Survey (WWFS) data, the cetane numbers of the samples analyzed were above the minimum regulatory limit of 51, except in 2017 and 2019.

Regarding the cetane index, SGS WWFS data shows that the cetane index complied wi