Application PetroOxy: Influence of Ignition Improvers (EHN)

Ignition improvers increase the Cetane number of distillate fuels by improving fuel ignition characteristics in the combustion chamber during the compression stroke.

Alternative to Traditional Stability Test Methods

The rapid small scale tester, PetroOxy, is a fast, safe and user friendly alternative to traditional stability test methods. The instrument measures the induction period, which can be used as an indication of the oxidation and storage stability. Compared to other oxidation and storage stability test methods, the PetroOxy procedure requires only a small sample to give exact test results in a short period of time.

Quick Preparation and Easy Handling

All it takes on preparation is to fill in the sample, tighten the pressure chambers lid and close the instrument. The test cell is automatically charged with oxygen pressure and heated until it reaches the test temperature of 140 °C in the standard program. Now the pressure is monitored until a pressure drop of 10 % from pmax is detected.

Fig. 1: Display of test progress

The influence of the ignition improver EHN (Ethyl Hexyl Nitrate) on the oxidation stability of two diesel samples.
of EHN
(Time in hours
until pmax-10%)
(Time in hours
until pmax-10%)



Tab.1: Results for EHN tests


Two diesel samples were tested with EHN contents between 0 % and 1 %.
As it was expected, an increasing content of the ignition improver EHN results in a lower oxidation stability.

Do you have any questions?

Contact Anton Paar ProveTec directly: support.provetec[at]

Learn more about the PetroOxy